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SEm-Labos/Libs/Memory_test/hdl/sdram_mt48lc16m16a2_sim.vhd

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Initial commit
2024-02-23 13:01:05 +00:00
-----------------------------------------------------------------------------------------
--
-- File Name: MT48LC16M16A2.VHD
-- Version: 0.0g
-- Date: June 29th, 2000
-- Model: Behavioral
-- Simulator: Model Technology (PC version 5.3 PE)
--
-- Dependencies: None
--
-- Author: Son P. Huynh
-- Email: sphuynh@micron.com
-- Phone: (208) 368-3825
-- Company: Micron Technology, Inc.
-- Part Number: MT48LC16M16A2 (4Mb x 16 x 4 Banks)
--
-- Description: Micron 256Mb SDRAM
--
-- Limitation: - Doesn't check for 4096-cycle refresh --'
--
-- Note: - Set simulator resolution to "ps" accuracy
--
-- Disclaimer: THESE DESIGNS ARE PROVIDED "AS IS" WITH NO WARRANTY
-- WHATSOEVER AND MICRON SPECIFICALLY DISCLAIMS ANY
-- IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
-- A PARTICULAR PURPOSE, OR AGAINST INFRINGEMENT.
--
-- Copyright (c) 1998 Micron Semiconductor Products, Inc.
-- All rights researved
--
-- Rev Author Phone Date Changes
-- ---- ---------------------------- ---------- -------------------------------------
-- 0.0g Son Huynh 208-368-3825 06/29/2000 Add Load/Dump memory array
-- Micron Technology Inc. Modify tWR + tRAS timing check
--
-- 0.0f Son Huynh 208-368-3825 07/08/1999 Fix tWR = 1 Clk + 7.5 ns (Auto)
-- Micron Technology Inc. Fix tWR = 15 ns (Manual)
-- Fix tRP (Autoprecharge to AutoRefresh)
--
-- 0.0c Son P. Huynh 208-368-3825 04/08/1999 Fix tWR + tRP in Write with AP
-- Micron Technology Inc. Fix tRC check in Load Mode Register
--
-- 0.0b Son P. Huynh 208-368-3825 01/06/1998 Derive from 64Mb SDRAM model
-- Micron Technology Inc.
--
-----------------------------------------------------------------------------------------
--LIBRARY STD;
-- use std.textio.all;
--LIBRARY IEEE;
-- USE IEEE.STD_LOGIC_1164.ALL;
--LIBRARY WORK;
-- USE WORK.MTI_PKG.ALL;
LIBRARY memory_test;
USE memory_test.mti_pkg.all;
--library grlib;
--use grlib.stdlib.all;
--library gaisler;
--use gaisler.sim.all;
--ENTITY mt48lc16m16a2 IS
-- GENERIC (
-- -- Timing Parameters for -75 (PC133) and CAS Latency = 2
-- tAC : TIME := 6.0 ns;
-- tHZ : TIME := 7.0 ns;
-- tOH : TIME := 2.7 ns;
-- tMRD : INTEGER := 2; -- 2 Clk Cycles
-- tRAS : TIME := 44.0 ns;
-- tRC : TIME := 66.0 ns;
-- tRCD : TIME := 20.0 ns;
-- tRP : TIME := 20.0 ns;
-- tRRD : TIME := 15.0 ns;
-- tWRa : TIME := 7.5 ns; -- A2 Version - Auto precharge mode only (1 Clk + 7.5 ns)
-- tWRp : TIME := 15.0 ns; -- A2 Version - Precharge mode only (15 ns)
--
-- tAH : TIME := 0.8 ns;
-- tAS : TIME := 1.5 ns;
-- tCH : TIME := 2.5 ns;
-- tCL : TIME := 2.5 ns;
-- tCK : TIME := 10.0 ns;
-- tDH : TIME := 0.8 ns;
-- tDS : TIME := 1.5 ns;
-- tCKH : TIME := 0.8 ns;
-- tCKS : TIME := 1.5 ns;
-- tCMH : TIME := 0.8 ns;
-- tCMS : TIME := 1.5 ns;
--
-- addr_bits : INTEGER := 13;
-- data_bits : INTEGER := 16;
-- col_bits : INTEGER := 9;
-- index : INTEGER := 0;
-- fname : string := "sdram.srec" -- File to read from
-- );
-- PORT (
-- Dq : INOUT STD_LOGIC_VECTOR (data_bits - 1 DOWNTO 0) := (OTHERS => 'Z');
-- Addr : IN STD_LOGIC_VECTOR (addr_bits - 1 DOWNTO 0) := (OTHERS => '0');
-- Ba : IN STD_LOGIC_VECTOR := "00";
-- Clk : IN STD_LOGIC := '0';
-- Cke : IN STD_LOGIC := '1';
-- Cs_n : IN STD_LOGIC := '1';
-- Ras_n : IN STD_LOGIC := '1';
-- Cas_n : IN STD_LOGIC := '1';
-- We_n : IN STD_LOGIC := '1';
-- Dqm : IN STD_LOGIC_VECTOR (1 DOWNTO 0) := "00"
-- );
--END mt48lc16m16a2;
ARCHITECTURE sim OF sdram_mt48lc16m16a2 IS
TYPE State IS (ACT, A_REF, BST, LMR, NOP, PRECH, READ, READ_A, WRITE, WRITE_A, LOAD_FILE, DUMP_FILE);
TYPE Array4xI IS ARRAY (3 DOWNTO 0) OF INTEGER;
TYPE Array4xT IS ARRAY (3 DOWNTO 0) OF TIME;
TYPE Array4xB IS ARRAY (3 DOWNTO 0) OF BIT;
TYPE Array4x2BV IS ARRAY (3 DOWNTO 0) OF BIT_VECTOR (1 DOWNTO 0);
TYPE Array4xCBV IS ARRAY (4 DOWNTO 0) OF BIT_VECTOR (Col_bits - 1 DOWNTO 0);
TYPE Array_state IS ARRAY (4 DOWNTO 0) OF State;
SIGNAL Operation : State := NOP;
SIGNAL Mode_reg : BIT_VECTOR (addr_bits - 1 DOWNTO 0) := (OTHERS => '0');
SIGNAL Active_enable, Aref_enable, Burst_term : BIT := '0';
SIGNAL Mode_reg_enable, Prech_enable, Read_enable, Write_enable : BIT := '0';
SIGNAL Burst_length_1, Burst_length_2, Burst_length_4, Burst_length_8 : BIT := '0';
SIGNAL Cas_latency_2, Cas_latency_3 : BIT := '0';
SIGNAL Ras_in, Cas_in, We_in : BIT := '0';
SIGNAL Write_burst_mode : BIT := '0';
SIGNAL RAS_clk, Sys_clk, CkeZ : BIT := '0';
-- Checking internal wires
SIGNAL Pre_chk : BIT_VECTOR (3 DOWNTO 0) := "0000";
SIGNAL Act_chk : BIT_VECTOR (3 DOWNTO 0) := "0000";
SIGNAL Dq_in_chk, Dq_out_chk : BIT := '0';
SIGNAL Bank_chk : BIT_VECTOR (1 DOWNTO 0) := "00";
SIGNAL Row_chk : BIT_VECTOR (addr_bits - 1 DOWNTO 0) := (OTHERS => '0');
SIGNAL Col_chk : BIT_VECTOR (col_bits - 1 DOWNTO 0) := (OTHERS => '0');
BEGIN
-- CS# Decode
WITH Cs_n SELECT
Cas_in <= TO_BIT (Cas_n, '1') WHEN '0',
'1' WHEN '1',
'1' WHEN OTHERS;
WITH Cs_n SELECT
Ras_in <= TO_BIT (Ras_n, '1') WHEN '0',
'1' WHEN '1',
'1' WHEN OTHERS;
WITH Cs_n SELECT
We_in <= TO_BIT (We_n, '1') WHEN '0',
'1' WHEN '1',
'1' WHEN OTHERS;
-- Commands Decode
Active_enable <= NOT(Ras_in) AND Cas_in AND We_in;
Aref_enable <= NOT(Ras_in) AND NOT(Cas_in) AND We_in;
Burst_term <= Ras_in AND Cas_in AND NOT(We_in);
Mode_reg_enable <= NOT(Ras_in) AND NOT(Cas_in) AND NOT(We_in);
Prech_enable <= NOT(Ras_in) AND Cas_in AND NOT(We_in);
Read_enable <= Ras_in AND NOT(Cas_in) AND We_in;
Write_enable <= Ras_in AND NOT(Cas_in) AND NOT(We_in);
-- Burst Length Decode
Burst_length_1 <= NOT(Mode_reg(2)) AND NOT(Mode_reg(1)) AND NOT(Mode_reg(0));
Burst_length_2 <= NOT(Mode_reg(2)) AND NOT(Mode_reg(1)) AND Mode_reg(0);
Burst_length_4 <= NOT(Mode_reg(2)) AND Mode_reg(1) AND NOT(Mode_reg(0));
Burst_length_8 <= NOT(Mode_reg(2)) AND Mode_reg(1) AND Mode_reg(0);
-- CAS Latency Decode
Cas_latency_2 <= NOT(Mode_reg(6)) AND Mode_reg(5) AND NOT(Mode_reg(4));
Cas_latency_3 <= NOT(Mode_reg(6)) AND Mode_reg(5) AND Mode_reg(4);
-- Write Burst Mode
Write_burst_mode <= Mode_reg(9);
-- RAS Clock for checking tWR and tRP
PROCESS
variable Clk0, Clk1 : integer := 0;
begin
RAS_clk <= '1';
wait for 0.5 ns;
RAS_clk <= '0';
wait for 0.5 ns;
if Clk0 > 100 or Clk1 > 100 then
wait;
else
if Clk = '1' and Cke = '1' then
Clk0 := 0;
Clk1 := Clk1 + 1;
elsif Clk = '0' and Cke = '1' then
Clk0 := Clk0 + 1;
Clk1 := 0;
end if;
end if;
END PROCESS;
-- System Clock
int_clk : PROCESS (Clk)
begin
IF Clk'LAST_VALUE = '0' AND Clk = '1' THEN --'
CkeZ <= TO_BIT(Cke, '1');
END IF;
Sys_clk <= CkeZ AND TO_BIT(Clk, '0');
END PROCESS;
state_register : PROCESS
-- NOTE: The extra bits in RAM_TYPE is for checking memory access. A logic 1 means
-- the location is in use. This will be checked when doing memory DUMP.
TYPE ram_type IS ARRAY (2**col_bits - 1 DOWNTO 0) OF BIT_VECTOR (data_bits DOWNTO 0);
TYPE ram_pntr IS ACCESS ram_type;
TYPE ram_stor IS ARRAY (2**addr_bits - 1 DOWNTO 0) OF ram_pntr;
VARIABLE Bank0 : ram_stor;
VARIABLE Bank1 : ram_stor;
VARIABLE Bank2 : ram_stor;
VARIABLE Bank3 : ram_stor;
VARIABLE Row_index, Col_index : INTEGER := 0;
VARIABLE Dq_temp : BIT_VECTOR (data_bits DOWNTO 0) := (OTHERS => '0');
VARIABLE Col_addr : Array4xCBV;
VARIABLE Bank_addr : Array4x2BV;
VARIABLE Dqm_reg0, Dqm_reg1 : BIT_VECTOR (1 DOWNTO 0) := "00";
VARIABLE Bank, Previous_bank : BIT_VECTOR (1 DOWNTO 0) := "00";
VARIABLE B0_row_addr, B1_row_addr, B2_row_addr, B3_row_addr : BIT_VECTOR (addr_bits - 1 DOWNTO 0) := (OTHERS => '0');
VARIABLE Col_brst : BIT_VECTOR (col_bits - 1 DOWNTO 0) := (OTHERS => '0');
VARIABLE Row : BIT_VECTOR (addr_bits - 1 DOWNTO 0) := (OTHERS => '0');
VARIABLE Col : BIT_VECTOR (col_bits - 1 DOWNTO 0) := (OTHERS => '0');
VARIABLE Burst_counter : INTEGER := 0;
VARIABLE Command : Array_state;
VARIABLE Bank_precharge : Array4x2BV;
VARIABLE A10_precharge : Array4xB := ('0' & '0' & '0' & '0');
VARIABLE Auto_precharge : Array4xB := ('0' & '0' & '0' & '0');
VARIABLE Read_precharge : Array4xB := ('0' & '0' & '0' & '0');
VARIABLE Write_precharge : Array4xB := ('0' & '0' & '0' & '0');
VARIABLE RW_interrupt_read : Array4xB := ('0' & '0' & '0' & '0');
VARIABLE RW_interrupt_write : Array4xB := ('0' & '0' & '0' & '0');
VARIABLE RW_interrupt_bank : BIT_VECTOR (1 DOWNTO 0) := "00";
VARIABLE Count_time : Array4xT := (0 ns & 0 ns & 0 ns & 0 ns);
VARIABLE Count_precharge : Array4xI := (0 & 0 & 0 & 0);
VARIABLE Data_in_enable, Data_out_enable : BIT := '0';
VARIABLE Pc_b0, Pc_b1, Pc_b2, Pc_b3 : BIT := '0';
VARIABLE Act_b0, Act_b1, Act_b2, Act_b3 : BIT := '0';
-- Timing Check
VARIABLE MRD_chk : INTEGER := 0;
VARIABLE WR_counter : Array4xI := (0 & 0 & 0 & 0);
VARIABLE WR_time : Array4xT := (0 ns & 0 ns & 0 ns & 0 ns);
VARIABLE WR_chkp : Array4xT := (0 ns & 0 ns & 0 ns & 0 ns);
VARIABLE RC_chk, RRD_chk : TIME := 0 ns;
VARIABLE RAS_chk0, RAS_chk1, RAS_chk2, RAS_chk3 : TIME := 0 ns;
VARIABLE RCD_chk0, RCD_chk1, RCD_chk2, RCD_chk3 : TIME := 0 ns;
VARIABLE RP_chk0, RP_chk1, RP_chk2, RP_chk3 : TIME := 0 ns;
-- Load and Dumb variables
FILE file_load : TEXT open read_mode is fname; -- Data load
FILE file_dump : TEXT open write_mode is "dumpdata.txt"; -- Data dump
VARIABLE bank_load : bit_vector ( 1 DOWNTO 0);
VARIABLE rows_load : BIT_VECTOR (12 DOWNTO 0);
VARIABLE cols_load : BIT_VECTOR ( 8 DOWNTO 0);
VARIABLE data_load : BIT_VECTOR (15 DOWNTO 0);
VARIABLE i, j : INTEGER;
VARIABLE good_load : BOOLEAN;
VARIABLE l : LINE;
variable load : std_logic := '1';
variable dump : std_logic := '0';
variable ch : character;
variable rectype : bit_vector(3 downto 0);
variable recaddr : bit_vector(31 downto 0);
variable reclen : bit_vector(7 downto 0);
variable recdata : bit_vector(0 to 16*8-1);
-- Initialize empty rows
PROCEDURE Init_mem (Bank : bit_vector (1 DOWNTO 0); Row_index : INTEGER) IS
VARIABLE i, j : INTEGER := 0;
BEGIN
IF Bank = "00" THEN
IF Bank0 (Row_index) = NULL THEN -- Check to see if row empty
Bank0 (Row_index) := NEW ram_type; -- Open new row for access
FOR i IN (2**col_bits - 1) DOWNTO 0 LOOP -- Filled row with zeros
FOR j IN (data_bits) DOWNTO 0 LOOP
Bank0 (Row_index) (i) (j) := '0';
END LOOP;
END LOOP;
END IF;
ELSIF Bank = "01" THEN
IF Bank1 (Row_index) = NULL THEN
Bank1 (Row_index) := NEW ram_type;
FOR i IN (2**col_bits - 1) DOWNTO 0 LOOP
FOR j IN (data_bits) DOWNTO 0 LOOP
Bank1 (Row_index) (i) (j) := '0';
END LOOP;
END LOOP;
END IF;
ELSIF Bank = "10" THEN
IF Bank2 (Row_index) = NULL THEN
Bank2 (Row_index) := NEW ram_type;
FOR i IN (2**col_bits - 1) DOWNTO 0 LOOP
FOR j IN (data_bits) DOWNTO 0 LOOP
Bank2 (Row_index) (i) (j) := '0';
END LOOP;
END LOOP;
END IF;
ELSIF Bank = "11" THEN
IF Bank3 (Row_index) = NULL THEN
Bank3 (Row_index) := NEW ram_type;
FOR i IN (2**col_bits - 1) DOWNTO 0 LOOP
FOR j IN (data_bits) DOWNTO 0 LOOP
Bank3 (Row_index) (i) (j) := '0';
END LOOP;
END LOOP;
END IF;
END IF;
END;
-- Burst Counter
PROCEDURE Burst_decode IS
VARIABLE Col_int : INTEGER := 0;
VARIABLE Col_vec, Col_temp : BIT_VECTOR (col_bits - 1 DOWNTO 0) := (OTHERS => '0');
BEGIN
-- Advance Burst Counter
Burst_counter := Burst_counter + 1;
-- Burst Type
IF Mode_reg (3) = '0' THEN
Col_int := TO_INTEGER(Col);
Col_int := Col_int + 1;
TO_BITVECTOR (Col_int, Col_temp);
ELSIF Mode_reg (3) = '1' THEN
TO_BITVECTOR (Burst_counter, Col_vec);
Col_temp (2) := Col_vec (2) XOR Col_brst (2);
Col_temp (1) := Col_vec (1) XOR Col_brst (1);
Col_temp (0) := Col_vec (0) XOR Col_brst (0);
END IF;
-- Burst Length
IF Burst_length_2 = '1' THEN
Col (0) := Col_temp (0);
ELSIF Burst_length_4 = '1' THEN
Col (1 DOWNTO 0) := Col_temp (1 DOWNTO 0);
ELSIF Burst_length_8 = '1' THEN
Col (2 DOWNTO 0) := Col_temp (2 DOWNTO 0);
ELSE
Col := Col_temp;
END IF;
-- Burst Read Single Write
IF Write_burst_mode = '1' AND Data_in_enable = '1' THEN
Data_in_enable := '0';
END IF;
-- Data counter
IF Burst_length_1 = '1' THEN
IF Burst_counter >= 1 THEN
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
ELSIF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
ELSIF Burst_length_2 = '1' THEN
IF Burst_counter >= 2 THEN
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
ELSIF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
ELSIF Burst_length_4 = '1' THEN
IF Burst_counter >= 4 THEN
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
ELSIF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
ELSIF Burst_length_8 = '1' THEN
IF Burst_counter >= 8 THEN
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
ELSIF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
END IF;
END;
BEGIN
WAIT ON Sys_clk, RAS_clk;
IF Sys_clk'event AND Sys_clk = '1' AND Load = '0' AND Dump = '0' THEN --'
-- Internal Command Pipeline
Command(0) := Command(1);
Command(1) := Command(2);
Command(2) := Command(3);
Command(3) := NOP;
Col_addr(0) := Col_addr(1);
Col_addr(1) := Col_addr(2);
Col_addr(2) := Col_addr(3);
Col_addr(3) := (OTHERS => '0');
Bank_addr(0) := Bank_addr(1);
Bank_addr(1) := Bank_addr(2);
Bank_addr(2) := Bank_addr(3);
Bank_addr(3) := "00";
Bank_precharge(0) := Bank_precharge(1);
Bank_precharge(1) := Bank_precharge(2);
Bank_precharge(2) := Bank_precharge(3);
Bank_precharge(3) := "00";
A10_precharge(0) := A10_precharge(1);
A10_precharge(1) := A10_precharge(2);
A10_precharge(2) := A10_precharge(3);
A10_precharge(3) := '0';
-- Operation Decode (Optional for showing current command on posedge clock / debug feature)
IF Active_enable = '1' THEN
Operation <= ACT;
ELSIF Aref_enable = '1' THEN
Operation <= A_REF;
ELSIF Burst_term = '1' THEN
Operation <= BST;
ELSIF Mode_reg_enable = '1' THEN
Operation <= LMR;
ELSIF Prech_enable = '1' THEN
Operation <= PRECH;
ELSIF Read_enable = '1' THEN
IF Addr(10) = '0' THEN
Operation <= READ;
ELSE
Operation <= READ_A;
END IF;
ELSIF Write_enable = '1' THEN
IF Addr(10) = '0' THEN
Operation <= WRITE;
ELSE
Operation <= WRITE_A;
END IF;
ELSE
Operation <= NOP;
END IF;
-- Dqm pipeline for Read
Dqm_reg0 := Dqm_reg1;
Dqm_reg1 := TO_BITVECTOR(Dqm);
-- Read or Write with Auto Precharge Counter
IF Auto_precharge (0) = '1' THEN
Count_precharge (0) := Count_precharge (0) + 1;
END IF;
IF Auto_precharge (1) = '1' THEN
Count_precharge (1) := Count_precharge (1) + 1;
END IF;
IF Auto_precharge (2) = '1' THEN
Count_precharge (2) := Count_precharge (2) + 1;
END IF;
IF Auto_precharge (3) = '1' THEN
Count_precharge (3) := Count_precharge (3) + 1;
END IF;
-- Auto Precharge Timer for tWR
if (Burst_length_1 = '1' OR Write_burst_mode = '1') then
if (Count_precharge(0) = 1) then
Count_time(0) := NOW;
end if;
if (Count_precharge(1) = 1) then
Count_time(1) := NOW;
end if;
if (Count_precharge(2) = 1) then
Count_time(2) := NOW;
end if;
if (Count_precharge(3) = 1) then
Count_time(3) := NOW;
end if;
elsif (Burst_length_2 = '1') then
if (Count_precharge(0) = 2) then
Count_time(0) := NOW;
end if;
if (Count_precharge(1) = 2) then
Count_time(1) := NOW;
end if;
if (Count_precharge(2) = 2) then
Count_time(2) := NOW;
end if;
if (Count_precharge(3) = 2) then
Count_time(3) := NOW;
end if;
elsif (Burst_length_4 = '1') then
if (Count_precharge(0) = 4) then
Count_time(0) := NOW;
end if;
if (Count_precharge(1) = 4) then
Count_time(1) := NOW;
end if;
if (Count_precharge(2) = 4) then
Count_time(2) := NOW;
end if;
if (Count_precharge(3) = 4) then
Count_time(3) := NOW;
end if;
elsif (Burst_length_8 = '1') then
if (Count_precharge(0) = 8) then
Count_time(0) := NOW;
end if;
if (Count_precharge(1) = 8) then
Count_time(1) := NOW;
end if;
if (Count_precharge(2) = 8) then
Count_time(2) := NOW;
end if;
if (Count_precharge(3) = 8) then
Count_time(3) := NOW;
end if;
end if;
-- tMRD Counter
MRD_chk := MRD_chk + 1;
-- tWR Counter
WR_counter(0) := WR_counter(0) + 1;
WR_counter(1) := WR_counter(1) + 1;
WR_counter(2) := WR_counter(2) + 1;
WR_counter(3) := WR_counter(3) + 1;
-- Auto Refresh
IF Aref_enable = '1' THEN
-- Auto Refresh to Auto Refresh
ASSERT (NOW - RC_chk >= tRC)
REPORT "tRC violation during Auto Refresh"
SEVERITY WARNING;
-- Precharge to Auto Refresh
ASSERT (NOW - RP_chk0 >= tRP OR NOW - RP_chk1 >= tRP OR NOW - RP_chk2 >= tRP OR NOW - RP_chk3 >= tRP)
REPORT "tRP violation during Auto Refresh"
SEVERITY WARNING;
-- All banks must be idle before refresh
IF (Pc_b3 ='0' OR Pc_b2 = '0' OR Pc_b1 ='0' OR Pc_b0 = '0') THEN
ASSERT (FALSE)
REPORT "All banks must be Precharge before Auto Refresh"
SEVERITY WARNING;
END IF;
-- Record current tRC time
RC_chk := NOW;
END IF;
-- Load Mode Register
IF Mode_reg_enable = '1' THEN
Mode_reg <= TO_BITVECTOR (Addr);
IF (Pc_b3 ='0' OR Pc_b2 = '0' OR Pc_b1 ='0' OR Pc_b0 = '0') THEN
ASSERT (FALSE)
REPORT "All bank must be Precharge before Load Mode Register"
SEVERITY WARNING;
END IF;
-- REF to LMR
ASSERT (NOW - RC_chk >= tRC)
REPORT "tRC violation during Load Mode Register"
SEVERITY WARNING;
-- LMR to LMR
ASSERT (MRD_chk >= tMRD)
REPORT "tMRD violation during Load Mode Register"
SEVERITY WARNING;
-- Record current tMRD time
MRD_chk := 0;
END IF;
-- Active Block (latch Bank and Row Address)
IF Active_enable = '1' THEN
IF Ba = "00" AND Pc_b0 = '1' THEN
Act_b0 := '1';
Pc_b0 := '0';
B0_row_addr := TO_BITVECTOR (Addr);
RCD_chk0 := NOW;
RAS_chk0 := NOW;
-- Precharge to Active Bank 0
ASSERT (NOW - RP_chk0 >= tRP)
REPORT "tRP violation during Activate Bank 0"
SEVERITY WARNING;
ELSIF Ba = "01" AND Pc_b1 = '1' THEN
Act_b1 := '1';
Pc_b1 := '0';
B1_row_addr := TO_BITVECTOR (Addr);
RCD_chk1 := NOW;
RAS_chk1 := NOW;
-- Precharge to Active Bank 1
ASSERT (NOW - RP_chk1 >= tRP)
REPORT "tRP violation during Activate Bank 1"
SEVERITY WARNING;
ELSIF Ba = "10" AND Pc_b2 = '1' THEN
Act_b2 := '1';
Pc_b2 := '0';
B2_row_addr := TO_BITVECTOR (Addr);
RCD_chk2 := NOW;
RAS_chk2 := NOW;
-- Precharge to Active Bank 2
ASSERT (NOW - RP_chk2 >= tRP)
REPORT "tRP violation during Activate Bank 2"
SEVERITY WARNING;
ELSIF Ba = "11" AND Pc_b3 = '1' THEN
Act_b3 := '1';
Pc_b3 := '0';
B3_row_addr := TO_BITVECTOR (Addr);
RCD_chk3 := NOW;
RAS_chk3 := NOW;
-- Precharge to Active Bank 3
ASSERT (NOW - RP_chk3 >= tRP)
REPORT "tRP violation during Activate Bank 3"
SEVERITY WARNING;
ELSIF Ba = "00" AND Pc_b0 = '0' THEN
ASSERT (FALSE)
REPORT "Bank 0 is not Precharged"
SEVERITY WARNING;
ELSIF Ba = "01" AND Pc_b1 = '0' THEN
ASSERT (FALSE)
REPORT "Bank 1 is not Precharged"
SEVERITY WARNING;
ELSIF Ba = "10" AND Pc_b2 = '0' THEN
ASSERT (FALSE)
REPORT "Bank 2 is not Precharged"
SEVERITY WARNING;
ELSIF Ba = "11" AND Pc_b3 = '0' THEN
ASSERT (FALSE)
REPORT "Bank 3 is not Precharged"
SEVERITY WARNING;
END IF;
-- Active Bank A to Active Bank B
IF ((Previous_bank /= TO_BITVECTOR (Ba)) AND (NOW - RRD_chk < tRRD)) THEN
ASSERT (FALSE)
REPORT "tRRD violation during Activate"
SEVERITY WARNING;
END IF;
-- LMR to ACT
ASSERT (MRD_chk >= tMRD)
REPORT "tMRD violation during Activate"
SEVERITY WARNING;
-- AutoRefresh to Activate
ASSERT (NOW - RC_chk >= tRC)
REPORT "tRC violation during Activate"
SEVERITY WARNING;
-- Record variable for checking violation
RRD_chk := NOW;
Previous_bank := TO_BITVECTOR (Ba);
END IF;
-- Precharge Block
IF Prech_enable = '1' THEN
IF Addr(10) = '1' THEN
Pc_b0 := '1';
Pc_b1 := '1';
Pc_b2 := '1';
Pc_b3 := '1';
Act_b0 := '0';
Act_b1 := '0';
Act_b2 := '0';
Act_b3 := '0';
RP_chk0 := NOW;
RP_chk1 := NOW;
RP_chk2 := NOW;
RP_chk3 := NOW;
-- Activate to Precharge all banks
ASSERT ((NOW - RAS_chk0 >= tRAS) OR (NOW - RAS_chk1 >= tRAS))
REPORT "tRAS violation during Precharge all banks"
SEVERITY WARNING;
-- tWR violation check for Write
IF ((NOW - WR_chkp(0) < tWRp) OR (NOW - WR_chkp(1) < tWRp) OR
(NOW - WR_chkp(2) < tWRp) OR (NOW - WR_chkp(3) < tWRp)) THEN
ASSERT (FALSE)
REPORT "tWR violation during Precharge ALL banks"
SEVERITY WARNING;
END IF;
ELSIF Addr(10) = '0' THEN
IF Ba = "00" THEN
Pc_b0 := '1';
Act_b0 := '0';
RP_chk0 := NOW;
-- Activate to Precharge bank 0
ASSERT (NOW - RAS_chk0 >= tRAS)
REPORT "tRAS violation during Precharge bank 0"
SEVERITY WARNING;
ELSIF Ba = "01" THEN
Pc_b1 := '1';
Act_b1 := '0';
RP_chk1 := NOW;
-- Activate to Precharge bank 1
ASSERT (NOW - RAS_chk1 >= tRAS)
REPORT "tRAS violation during Precharge bank 1"
SEVERITY WARNING;
ELSIF Ba = "10" THEN
Pc_b2 := '1';
Act_b2 := '0';
RP_chk2 := NOW;
-- Activate to Precharge bank 2
ASSERT (NOW - RAS_chk2 >= tRAS)
REPORT "tRAS violation during Precharge bank 2"
SEVERITY WARNING;
ELSIF Ba = "11" THEN
Pc_b3 := '1';
Act_b3 := '0';
RP_chk3 := NOW;
-- Activate to Precharge bank 3
ASSERT (NOW - RAS_chk3 >= tRAS)
REPORT "tRAS violation during Precharge bank 3"
SEVERITY WARNING;
END IF;
-- tWR violation check for Write
ASSERT (NOW - WR_chkp(TO_INTEGER(Ba)) >= tWRp)
REPORT "tWR violation during Precharge"
SEVERITY WARNING;
END IF;
-- Terminate a Write Immediately (if same bank or all banks)
IF (Data_in_enable = '1' AND (Bank = TO_BITVECTOR(Ba) OR Addr(10) = '1')) THEN
Data_in_enable := '0';
END IF;
-- Precharge Command Pipeline for READ
IF CAS_latency_3 = '1' THEN
Command(2) := PRECH;
Bank_precharge(2) := TO_BITVECTOR (Ba);
A10_precharge(2) := TO_BIT(Addr(10));
ELSIF CAS_latency_2 = '1' THEN
Command(1) := PRECH;
Bank_precharge(1) := TO_BITVECTOR (Ba);
A10_precharge(1) := TO_BIT(Addr(10));
END IF;
END IF;
-- Burst Terminate
IF Burst_term = '1' THEN
-- Terminate a Write immediately
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
END IF;
-- Terminate a Read depend on CAS Latency
IF CAS_latency_3 = '1' THEN
Command(2) := BST;
ELSIF CAS_latency_2 = '1' THEN
Command(1) := BST;
END IF;
END IF;
-- Read, Write, Column Latch
IF Read_enable = '1' OR Write_enable = '1' THEN
-- Check to see if bank is open (ACT) for Read or Write
IF ((Ba="00" AND Pc_b0='1') OR (Ba="01" AND Pc_b1='1') OR (Ba="10" AND Pc_b2='1') OR (Ba="11" AND Pc_b3='1')) THEN
ASSERT (FALSE)
REPORT "Cannot Read or Write - Bank is not Activated"
SEVERITY WARNING;
END IF;
-- Activate to Read or Write
IF Ba = "00" THEN
ASSERT (NOW - RCD_chk0 >= tRCD)
REPORT "tRCD violation during Read or Write to Bank 0"
SEVERITY WARNING;
ELSIF Ba = "01" THEN
ASSERT (NOW - RCD_chk1 >= tRCD)
REPORT "tRCD violation during Read or Write to Bank 1"
SEVERITY WARNING;
ELSIF Ba = "10" THEN
ASSERT (NOW - RCD_chk2 >= tRCD)
REPORT "tRCD violation during Read or Write to Bank 2"
SEVERITY WARNING;
ELSIF Ba = "11" THEN
ASSERT (NOW - RCD_chk3 >= tRCD)
REPORT "tRCD violation during Read or Write to Bank 3"
SEVERITY WARNING;
END IF;
-- Read Command
IF Read_enable = '1' THEN
-- CAS Latency Pipeline
IF Cas_latency_3 = '1' THEN
IF Addr(10) = '1' THEN
Command(2) := READ_A;
ELSE
Command(2) := READ;
END IF;
Col_addr (2) := TO_BITVECTOR (Addr(col_bits - 1 DOWNTO 0));
Bank_addr (2) := TO_BITVECTOR (Ba);
ELSIF Cas_latency_2 = '1' THEN
IF Addr(10) = '1' THEN
Command(1) := READ_A;
ELSE
Command(1) := READ;
END IF;
Col_addr (1) := TO_BITVECTOR (Addr(col_bits - 1 DOWNTO 0));
Bank_addr (1) := TO_BITVECTOR (Ba);
END IF;
-- Read intterupt a Write (terminate Write immediately)
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
END IF;
-- Write Command
ELSIF Write_enable = '1' THEN
IF Addr(10) = '1' THEN
Command(0) := WRITE_A;
ELSE
Command(0) := WRITE;
END IF;
Col_addr (0) := TO_BITVECTOR (Addr(col_bits - 1 DOWNTO 0));
Bank_addr (0) := TO_BITVECTOR (Ba);
-- Write intterupt a Write (terminate Write immediately)
IF Data_in_enable = '1' THEN
Data_in_enable := '0';
END IF;
-- Write interrupt a Read (terminate Read immediately)
IF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
-- Interrupt a Write with Auto Precharge
IF Auto_precharge(TO_INTEGER(RW_Interrupt_Bank)) = '1' AND Write_precharge(TO_INTEGER(RW_Interrupt_Bank)) = '1' THEN
RW_interrupt_write(TO_INTEGER(RW_Interrupt_Bank)) := '1';
END IF;
-- Interrupt a Read with Auto Precharge
IF Auto_precharge(TO_INTEGER(RW_Interrupt_Bank)) = '1' AND Read_precharge(TO_INTEGER(RW_Interrupt_Bank)) = '1' THEN
RW_interrupt_read(TO_INTEGER(RW_Interrupt_Bank)) := '1';
END IF;
-- Read or Write with Auto Precharge
IF Addr(10) = '1' THEN
Auto_precharge (TO_INTEGER(Ba)) := '1';
Count_precharge (TO_INTEGER(Ba)) := 0;
RW_Interrupt_Bank := TO_BitVector(Ba);
IF Read_enable = '1' THEN
Read_precharge (TO_INTEGER(Ba)) := '1';
ELSIF Write_enable = '1' THEN
Write_precharge (TO_INTEGER(Ba)) := '1';
END IF;
END IF;
END IF;
-- Read with AutoPrecharge Calculation
-- The device start internal precharge when:
-- 1. BL/2 cycles after command
-- and 2. Meet tRAS requirement
-- or 3. Interrupt by a Read or Write (with or without Auto Precharge)
IF ((Auto_precharge(0) = '1') AND (Read_precharge(0) = '1')) THEN
IF (((NOW - RAS_chk0 >= tRAS) AND
((Burst_length_1 = '1' AND Count_precharge(0) >= 1) OR
(Burst_length_2 = '1' AND Count_precharge(0) >= 2) OR
(Burst_length_4 = '1' AND Count_precharge(0) >= 4) OR
(Burst_length_8 = '1' AND Count_precharge(0) >= 8))) OR
(RW_interrupt_read(0) = '1')) THEN
Pc_b0 := '1';
Act_b0 := '0';
RP_chk0 := NOW;
Auto_precharge(0) := '0';
Read_precharge(0) := '0';
RW_interrupt_read(0) := '0';
END IF;
END IF;
IF ((Auto_precharge(1) = '1') AND (Read_precharge(1) = '1')) THEN
IF (((NOW - RAS_chk1 >= tRAS) AND
((Burst_length_1 = '1' AND Count_precharge(1) >= 1) OR
(Burst_length_2 = '1' AND Count_precharge(1) >= 2) OR
(Burst_length_4 = '1' AND Count_precharge(1) >= 4) OR
(Burst_length_8 = '1' AND Count_precharge(1) >= 8))) OR
(RW_interrupt_read(1) = '1')) THEN
Pc_b1 := '1';
Act_b1 := '0';
RP_chk1 := NOW;
Auto_precharge(1) := '0';
Read_precharge(1) := '0';
RW_interrupt_read(1) := '0';
END IF;
END IF;
IF ((Auto_precharge(2) = '1') AND (Read_precharge(2) = '1')) THEN
IF (((NOW - RAS_chk2 >= tRAS) AND
((Burst_length_1 = '1' AND Count_precharge(2) >= 1) OR
(Burst_length_2 = '1' AND Count_precharge(2) >= 2) OR
(Burst_length_4 = '1' AND Count_precharge(2) >= 4) OR
(Burst_length_8 = '1' AND Count_precharge(2) >= 8))) OR
(RW_interrupt_read(2) = '1')) THEN
Pc_b2 := '1';
Act_b2 := '0';
RP_chk2 := NOW;
Auto_precharge(2) := '0';
Read_precharge(2) := '0';
RW_interrupt_read(2) := '0';
END IF;
END IF;
IF ((Auto_precharge(3) = '1') AND (Read_precharge(3) = '1')) THEN
IF (((NOW - RAS_chk3 >= tRAS) AND
((Burst_length_1 = '1' AND Count_precharge(3) >= 1) OR
(Burst_length_2 = '1' AND Count_precharge(3) >= 2) OR
(Burst_length_4 = '1' AND Count_precharge(3) >= 4) OR
(Burst_length_8 = '1' AND Count_precharge(3) >= 8))) OR
(RW_interrupt_read(3) = '1')) THEN
Pc_b3 := '1';
Act_b3 := '0';
RP_chk3 := NOW;
Auto_precharge(3) := '0';
Read_precharge(3) := '0';
RW_interrupt_read(3) := '0';
END IF;
END IF;
-- Internal Precharge or Bst
IF Command(0) = PRECH THEN -- PRECH terminate a read if same bank or all banks
IF Bank_precharge(0) = Bank OR A10_precharge(0) = '1' THEN
IF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
ELSIF Command(0) = BST THEN -- BST terminate a read regardless of bank
IF Data_out_enable = '1' THEN
Data_out_enable := '0';
END IF;
END IF;
IF Data_out_enable = '0' THEN
Dq <= TRANSPORT (OTHERS => 'Z') AFTER tOH;
END IF;
-- Detect Read or Write Command
IF Command(0) = READ OR Command(0) = READ_A THEN
Bank := Bank_addr (0);
Col := Col_addr (0);
Col_brst := Col_addr (0);
IF Bank_addr (0) = "00" THEN
Row := B0_row_addr;
ELSIF Bank_addr (0) = "01" THEN
Row := B1_row_addr;
ELSIF Bank_addr (0) = "10" THEN
Row := B2_row_addr;
ELSE
Row := B3_row_addr;
END IF;
Burst_counter := 0;
Data_in_enable := '0';
Data_out_enable := '1';
ELSIF Command(0) = WRITE OR Command(0) = WRITE_A THEN
Bank := Bank_addr(0);
Col := Col_addr(0);
Col_brst := Col_addr(0);
IF Bank_addr (0) = "00" THEN
Row := B0_row_addr;
ELSIF Bank_addr (0) = "01" THEN
Row := B1_row_addr;
ELSIF Bank_addr (0) = "10" THEN
Row := B2_row_addr;
ELSE
Row := B3_row_addr;
END IF;
Burst_counter := 0;
Data_in_enable := '1';
Data_out_enable := '0';
END IF;
-- DQ (Driver / Receiver)
Row_index := TO_INTEGER (Row);
Col_index := TO_INTEGER (Col);
IF Data_in_enable = '1' THEN
IF Dqm /= "11" THEN
Init_mem (Bank, Row_index);
IF Bank = "00" THEN
Dq_temp := Bank0 (Row_index) (Col_index);
IF Dqm = "01" THEN
Dq_temp (15 DOWNTO 8) := TO_BITVECTOR (Dq (15 DOWNTO 8));
ELSIF Dqm = "10" THEN
Dq_temp (7 DOWNTO 0) := TO_BITVECTOR (Dq (7 DOWNTO 0));
ELSE
Dq_temp (15 DOWNTO 0) := TO_BITVECTOR (Dq (15 DOWNTO 0));
END IF;
Bank0 (Row_index) (Col_index) := ('1' & Dq_temp(data_bits - 1 DOWNTO 0));
ELSIF Bank = "01" THEN
Dq_temp := Bank1 (Row_index) (Col_index);
IF Dqm = "01" THEN
Dq_temp (15 DOWNTO 8) := TO_BITVECTOR (Dq (15 DOWNTO 8));
ELSIF Dqm = "10" THEN
Dq_temp (7 DOWNTO 0) := TO_BITVECTOR (Dq (7 DOWNTO 0));
ELSE
Dq_temp (15 DOWNTO 0) := TO_BITVECTOR (Dq (15 DOWNTO 0));
END IF;
Bank1 (Row_index) (Col_index) := ('1' & Dq_temp(data_bits - 1 DOWNTO 0));
ELSIF Bank = "10" THEN
Dq_temp := Bank2 (Row_index) (Col_index);
IF Dqm = "01" THEN
Dq_temp (15 DOWNTO 8) := TO_BITVECTOR (Dq (15 DOWNTO 8));
ELSIF Dqm = "10" THEN
Dq_temp (7 DOWNTO 0) := TO_BITVECTOR (Dq (7 DOWNTO 0));
ELSE
Dq_temp (15 DOWNTO 0) := TO_BITVECTOR (Dq (15 DOWNTO 0));
END IF;
Bank2 (Row_index) (Col_index) := ('1' & Dq_temp(data_bits - 1 DOWNTO 0));
ELSIF Bank = "11" THEN
Dq_temp := Bank3 (Row_index) (Col_index);
IF Dqm = "01" THEN
Dq_temp (15 DOWNTO 8) := TO_BITVECTOR (Dq (15 DOWNTO 8));
ELSIF Dqm = "10" THEN
Dq_temp (7 DOWNTO 0) := TO_BITVECTOR (Dq (7 DOWNTO 0));
ELSE
Dq_temp (15 DOWNTO 0) := TO_BITVECTOR (Dq (15 DOWNTO 0));
END IF;
Bank3 (Row_index) (Col_index) := ('1' & Dq_temp(data_bits - 1 DOWNTO 0));
END IF;
WR_chkp(TO_INTEGER(Bank)) := NOW;
WR_counter(TO_INTEGER(Bank)) := 0;
END IF;
Burst_decode;
ELSIF Data_out_enable = '1' THEN
IF Dqm_reg0 /= "11" THEN
Init_mem (Bank, Row_index);
IF Bank = "00" THEN
Dq_temp := Bank0 (Row_index) (Col_index);
IF Dqm_reg0 = "00" THEN
Dq (15 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 0)) AFTER tAC;
ELSIF Dqm_reg0 = "01" THEN
Dq (15 DOWNTO 8) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 8)) AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
ELSIF Dqm_reg0 = "10" THEN
Dq (15 DOWNTO 8) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (7 DOWNTO 0)) AFTER tAC;
END IF;
ELSIF Bank = "01" THEN
Dq_temp := Bank1 (Row_index) (Col_index);
IF Dqm_reg0 = "00" THEN
Dq (15 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 0)) AFTER tAC;
ELSIF Dqm_reg0 = "01" THEN
Dq (15 DOWNTO 8) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 8)) AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
ELSIF Dqm_reg0 = "10" THEN
Dq (15 DOWNTO 8) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (7 DOWNTO 0)) AFTER tAC;
END IF;
ELSIF Bank = "10" THEN
Dq_temp := Bank2 (Row_index) (Col_index);
IF Dqm_reg0 = "00" THEN
Dq (15 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 0)) AFTER tAC;
ELSIF Dqm_reg0 = "01" THEN
Dq (15 DOWNTO 8) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 8)) AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
ELSIF Dqm_reg0 = "10" THEN
Dq (15 DOWNTO 8) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (7 DOWNTO 0)) AFTER tAC;
END IF;
ELSIF Bank = "11" THEN
Dq_temp := Bank3 (Row_index) (Col_index);
IF Dqm_reg0 = "00" THEN
Dq (15 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 0)) AFTER tAC;
ELSIF Dqm_reg0 = "01" THEN
Dq (15 DOWNTO 8) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (15 DOWNTO 8)) AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
ELSIF Dqm_reg0 = "10" THEN
Dq (15 DOWNTO 8) <= TRANSPORT (OTHERS => 'Z') AFTER tAC;
Dq (7 DOWNTO 0) <= TRANSPORT TO_STDLOGICVECTOR (Dq_temp (7 DOWNTO 0)) AFTER tAC;
END IF;
END IF;
ELSE
Dq <= TRANSPORT (OTHERS => 'Z') AFTER tHZ;
END IF;
Burst_decode;
END IF;
ELSIF Sys_clk'event AND Sys_clk = '1' AND Load = '1' AND Dump = '0' THEN --'
Operation <= LOAD_FILE;
load := '0';
-- ASSERT (FALSE) REPORT "Reading memory array from file. This operation may take several minutes. Please wait..."
-- SEVERITY NOTE;
WHILE NOT endfile(file_load) LOOP
readline(file_load, l);
read(l, ch);
if (ch /= 'S') or (ch /= 's') then
hexread(l, rectype);
hexread(l, reclen);
recaddr := (others => '0');
case rectype is
when "0001" =>
hexread(l, recaddr(15 downto 0));
when "0010" =>
hexread(l, recaddr(23 downto 0));
when "0011" =>
hexread(l, recaddr);
recaddr(31 downto 24) := (others => '0');
when others => next;
end case;
if true then
hexread(l, recdata);
Bank_Load := recaddr(25 downto 24);
Rows_Load := recaddr(23 downto 11);
Cols_Load := recaddr(10 downto 2);
Init_Mem (Bank_Load, To_Integer(Rows_Load));
IF Bank_Load = "00" THEN
for i in 0 to 3 loop
Bank0 (To_Integer(Rows_Load)) (To_Integer(Cols_Load)+i) := ('1' & recdata(i*32+index to i*32+index+15));
end loop;
ELSIF Bank_Load = "01" THEN
for i in 0 to 3 loop
Bank1 (To_Integer(Rows_Load)) (To_Integer(Cols_Load)+i) := ('1' & recdata(i*32+index to i*32+index+15));
end loop;
ELSIF Bank_Load = "10" THEN
for i in 0 to 3 loop
Bank2 (To_Integer(Rows_Load)) (To_Integer(Cols_Load)+i) := ('1' & recdata(i*32+index to i*32+index+15));
end loop;
ELSIF Bank_Load = "11" THEN
for i in 0 to 3 loop
Bank3 (To_Integer(Rows_Load)) (To_Integer(Cols_Load)+i) := ('1' & recdata(i*32+index to i*32+index+15));
end loop;
END IF;
END IF;
END IF;
END LOOP;
ELSIF Sys_clk'event AND Sys_clk = '1' AND Load = '0' AND Dump = '1' THEN --'
Operation <= DUMP_FILE;
ASSERT (FALSE) REPORT "Writing memory array to file. This operation may take several minutes. Please wait..."
SEVERITY NOTE;
WRITE (l, string'("# Micron Technology, Inc. (FILE DUMP / MEMORY DUMP)")); --'
WRITELINE (file_dump, l);
WRITE (l, string'("# BA ROWS COLS DQ")); --'
WRITELINE (file_dump, l);
WRITE (l, string'("# -- ------------- --------- ----------------")); --'
WRITELINE (file_dump, l);
-- Dumping Bank 0
FOR i IN 0 TO 2**addr_bits -1 LOOP
-- Check if ROW is NULL
IF Bank0 (i) /= NULL THEN
For j IN 0 TO 2**col_bits - 1 LOOP
-- Check if COL is NULL
NEXT WHEN Bank0 (i) (j) (data_bits) = '0';
WRITE (l, string'("00"), right, 4); --'
WRITE (l, To_BitVector(Conv_Std_Logic_Vector(i, addr_bits)), right, addr_bits+1);
WRITE (l, To_BitVector(Conv_std_Logic_Vector(j, col_bits)), right, col_bits+1);
WRITE (l, Bank0 (i) (j) (data_bits -1 DOWNTO 0), right, data_bits+1);
WRITELINE (file_dump, l);
END LOOP;
END IF;
END LOOP;
-- Dumping Bank 1
FOR i IN 0 TO 2**addr_bits -1 LOOP
-- Check if ROW is NULL
IF Bank1 (i) /= NULL THEN
For j IN 0 TO 2**col_bits - 1 LOOP
-- Check if COL is NULL
NEXT WHEN Bank1 (i) (j) (data_bits) = '0';
WRITE (l, string'("01"), right, 4); --'
WRITE (l, To_BitVector(Conv_Std_Logic_Vector(i, addr_bits)), right, addr_bits+1);
WRITE (l, To_BitVector(Conv_std_Logic_Vector(j, col_bits)), right, col_bits+1);
WRITE (l, Bank1 (i) (j) (data_bits -1 DOWNTO 0), right, data_bits+1);
WRITELINE (file_dump, l);
END LOOP;
END IF;
END LOOP;
-- Dumping Bank 2
FOR i IN 0 TO 2**addr_bits -1 LOOP
-- Check if ROW is NULL
IF Bank2 (i) /= NULL THEN
For j IN 0 TO 2**col_bits - 1 LOOP
-- Check if COL is NULL
NEXT WHEN Bank2 (i) (j) (data_bits) = '0';
WRITE (l, string'("10"), right, 4); --'
WRITE (l, To_BitVector(Conv_Std_Logic_Vector(i, addr_bits)), right, addr_bits+1);
WRITE (l, To_BitVector(Conv_std_Logic_Vector(j, col_bits)), right, col_bits+1);
WRITE (l, Bank2 (i) (j) (data_bits -1 DOWNTO 0), right, data_bits+1);
WRITELINE (file_dump, l);
END LOOP;
END IF;
END LOOP;
-- Dumping Bank 3
FOR i IN 0 TO 2**addr_bits -1 LOOP
-- Check if ROW is NULL
IF Bank3 (i) /= NULL THEN
For j IN 0 TO 2**col_bits - 1 LOOP
-- Check if COL is NULL
NEXT WHEN Bank3 (i) (j) (data_bits) = '0';
WRITE (l, string'("11"), right, 4); --'
WRITE (l, To_BitVector(Conv_Std_Logic_Vector(i, addr_bits)), right, addr_bits+1);
WRITE (l, To_BitVector(Conv_std_Logic_Vector(j, col_bits)), right, col_bits+1);
WRITE (l, Bank3 (i) (j) (data_bits -1 DOWNTO 0), right, data_bits+1);
WRITELINE (file_dump, l);
END LOOP;
END IF;
END LOOP;
END IF;
-- Write with AutoPrecharge Calculation
-- The device start internal precharge when:
-- 1. tWR cycles after command
-- and 2. Meet tRAS requirement
-- or 3. Interrupt by a Read or Write (with or without Auto Precharge)
IF ((Auto_precharge(0) = '1') AND (Write_precharge(0) = '1')) THEN
IF (((NOW - RAS_chk0 >= tRAS) AND
(((Burst_length_1 = '1' OR Write_burst_mode = '1' ) AND Count_precharge(0) >= 1 AND NOW - Count_time(0) >= tWRa) OR
(Burst_length_2 = '1' AND Count_precharge(0) >= 2 AND NOW - Count_time(0) >= tWRa) OR
(Burst_length_4 = '1' AND Count_precharge(0) >= 4 AND NOW - Count_time(0) >= tWRa) OR
(Burst_length_8 = '1' AND Count_precharge(0) >= 8 AND NOW - Count_time(0) >= tWRa))) OR
(RW_interrupt_write(0) = '1' AND WR_counter(0) >= 1 AND NOW - WR_time(0) >= tWRa)) THEN
Auto_precharge(0) := '0';
Write_precharge(0) := '0';
RW_interrupt_write(0) := '0';
Pc_b0 := '1';
Act_b0 := '0';
RP_chk0 := NOW;
ASSERT FALSE REPORT "Start Internal Precharge Bank 0" SEVERITY NOTE;
END IF;
END IF;
IF ((Auto_precharge(1) = '1') AND (Write_precharge(1) = '1')) THEN
IF (((NOW - RAS_chk1 >= tRAS) AND
(((Burst_length_1 = '1' OR Write_burst_mode = '1' ) AND Count_precharge(1) >= 1 AND NOW - Count_time(1) >= tWRa) OR
(Burst_length_2 = '1' AND Count_precharge(1) >= 2 AND NOW - Count_time(1) >= tWRa) OR
(Burst_length_4 = '1' AND Count_precharge(1) >= 4 AND NOW - Count_time(1) >= tWRa) OR
(Burst_length_8 = '1' AND Count_precharge(1) >= 8 AND NOW - Count_time(1) >= tWRa))) OR
(RW_interrupt_write(1) = '1' AND WR_counter(1) >= 1 AND NOW - WR_time(1) >= tWRa)) THEN
Auto_precharge(1) := '0';
Write_precharge(1) := '0';
RW_interrupt_write(1) := '0';
Pc_b1 := '1';
Act_b1 := '0';
RP_chk1 := NOW;
END IF;
END IF;
IF ((Auto_precharge(2) = '1') AND (Write_precharge(2) = '1')) THEN
IF (((NOW - RAS_chk2 >= tRAS) AND
(((Burst_length_1 = '1' OR Write_burst_mode = '1' ) AND Count_precharge(2) >= 1 AND NOW - Count_time(2) >= tWRa) OR
(Burst_length_2 = '1' AND Count_precharge(2) >= 2 AND NOW - Count_time(2) >= tWRa) OR
(Burst_length_4 = '1' AND Count_precharge(2) >= 4 AND NOW - Count_time(2) >= tWRa) OR
(Burst_length_8 = '1' AND Count_precharge(2) >= 8 AND NOW - Count_time(2) >= tWRa))) OR
(RW_interrupt_write(2) = '1' AND WR_counter(2) >= 1 AND NOW - WR_time(2) >= tWRa)) THEN
Auto_precharge(2) := '0';
Write_precharge(2) := '0';
RW_interrupt_write(2) := '0';
Pc_b2 := '1';
Act_b2 := '0';
RP_chk2 := NOW;
END IF;
END IF;
IF ((Auto_precharge(3) = '1') AND (Write_precharge(3) = '1')) THEN
IF (((NOW - RAS_chk3 >= tRAS) AND
(((Burst_length_1 = '1' OR Write_burst_mode = '1' ) AND Count_precharge(3) >= 1 AND NOW - Count_time(3) >= tWRa) OR
(Burst_length_2 = '1' AND Count_precharge(3) >= 2 AND NOW - Count_time(3) >= tWRa) OR
(Burst_length_4 = '1' AND Count_precharge(3) >= 4 AND NOW - Count_time(3) >= tWRa) OR
(Burst_length_8 = '1' AND Count_precharge(3) >= 8 AND NOW - Count_time(3) >= tWRa))) OR
(RW_interrupt_write(0) = '1' AND WR_counter(0) >= 1 AND NOW - WR_time(3) >= tWRa)) THEN
Auto_precharge(3) := '0';
Write_precharge(3) := '0';
RW_interrupt_write(3) := '0';
Pc_b3 := '1';
Act_b3 := '0';
RP_chk3 := NOW;
END IF;
END IF;
-- Checking internal wires (Optional for debug purpose)
Pre_chk (0) <= Pc_b0;
Pre_chk (1) <= Pc_b1;
Pre_chk (2) <= Pc_b2;
Pre_chk (3) <= Pc_b3;
Act_chk (0) <= Act_b0;
Act_chk (1) <= Act_b1;
Act_chk (2) <= Act_b2;
Act_chk (3) <= Act_b3;
Dq_in_chk <= Data_in_enable;
Dq_out_chk <= Data_out_enable;
Bank_chk <= Bank;
Row_chk <= Row;
Col_chk <= Col;
END PROCESS;
-- Clock timing checks
-- Clock_check : PROCESS
-- VARIABLE Clk_low, Clk_high : TIME := 0 ns;
-- BEGIN
-- WAIT ON Clk;
-- IF (Clk = '1' AND NOW >= 10 ns) THEN
-- ASSERT (NOW - Clk_low >= tCL)
-- REPORT "tCL violation"
-- SEVERITY WARNING;
-- ASSERT (NOW - Clk_high >= tCK)
-- REPORT "tCK violation"
-- SEVERITY WARNING;
-- Clk_high := NOW;
-- ELSIF (Clk = '0' AND NOW /= 0 ns) THEN
-- ASSERT (NOW - Clk_high >= tCH)
-- REPORT "tCH violation"
-- SEVERITY WARNING;
-- Clk_low := NOW;
-- END IF;
-- END PROCESS;
-- Setup timing checks
Setup_check : PROCESS
BEGIN
wait;
WAIT ON Clk;
IF Clk = '1' THEN
ASSERT(Cke'LAST_EVENT >= tCKS) --'
REPORT "CKE Setup time violation -- tCKS"
SEVERITY WARNING;
ASSERT(Cs_n'LAST_EVENT >= tCMS) --'
REPORT "CS# Setup time violation -- tCMS"
SEVERITY WARNING;
ASSERT(Cas_n'LAST_EVENT >= tCMS) --'
REPORT "CAS# Setup time violation -- tCMS"
SEVERITY WARNING;
ASSERT(Ras_n'LAST_EVENT >= tCMS) --'
REPORT "RAS# Setup time violation -- tCMS"
SEVERITY WARNING;
ASSERT(We_n'LAST_EVENT >= tCMS) --'
REPORT "WE# Setup time violation -- tCMS"
SEVERITY WARNING;
ASSERT(Dqm'LAST_EVENT >= tCMS) --'
REPORT "Dqm Setup time violation -- tCMS"
SEVERITY WARNING;
ASSERT(Addr'LAST_EVENT >= tAS) --'
REPORT "ADDR Setup time violation -- tAS"
SEVERITY WARNING;
ASSERT(Ba'LAST_EVENT >= tAS) --'
REPORT "BA Setup time violation -- tAS"
SEVERITY WARNING;
ASSERT(Dq'LAST_EVENT >= tDS) --'
REPORT "Dq Setup time violation -- tDS"
SEVERITY WARNING;
END IF;
END PROCESS;
-- Hold timing checks
Hold_check : PROCESS
BEGIN
wait;
WAIT ON Clk'DELAYED (tCKH), Clk'DELAYED (tCMH), Clk'DELAYED (tAH), Clk'DELAYED (tDH);
IF Clk'DELAYED (tCKH) = '1' THEN --'
ASSERT(Cke'LAST_EVENT > tCKH) --'
REPORT "CKE Hold time violation -- tCKH"
SEVERITY WARNING;
END IF;
IF Clk'DELAYED (tCMH) = '1' THEN --'
ASSERT(Cs_n'LAST_EVENT > tCMH) --'
REPORT "CS# Hold time violation -- tCMH"
SEVERITY WARNING;
ASSERT(Cas_n'LAST_EVENT > tCMH) --'
REPORT "CAS# Hold time violation -- tCMH"
SEVERITY WARNING;
ASSERT(Ras_n'LAST_EVENT > tCMH) --'
REPORT "RAS# Hold time violation -- tCMH"
SEVERITY WARNING;
ASSERT(We_n'LAST_EVENT > tCMH) --'
REPORT "WE# Hold time violation -- tCMH"
SEVERITY WARNING;
ASSERT(Dqm'LAST_EVENT > tCMH) --'
REPORT "Dqm Hold time violation -- tCMH"
SEVERITY WARNING;
END IF;
IF Clk'DELAYED (tAH) = '1' THEN --'
ASSERT(Addr'LAST_EVENT > tAH) --'
REPORT "ADDR Hold time violation -- tAH"
SEVERITY WARNING;
ASSERT(Ba'LAST_EVENT > tAH) --'
REPORT "BA Hold time violation -- tAH"
SEVERITY WARNING;
END IF;
IF Clk'DELAYED (tDH) = '1' THEN --'
ASSERT(Dq'LAST_EVENT > tDH) --'
REPORT "Dq Hold time violation -- tDH"
SEVERITY WARNING;
END IF;
END PROCESS;
END ARCHITECTURE sim;
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