60 lines
2.5 KiB
VHDL
60 lines
2.5 KiB
VHDL
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LIBRARY ieee;
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USE ieee.std_logic_1164.all;
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PACKAGE ahbLite IS
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------------------------------------------------------------------------------
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-- bus components sizes
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constant ahbAddressBitNb : positive := 16;
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constant ahbDataBitNb : positive := 16;
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constant ahbSlaveNb : positive := 16;
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constant ahbTransBitNb : positive := 2;
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constant ahbSizeBitNb : positive := 1;
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constant ahbBurstBitNb : positive := 3;
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constant ahbProtBitNb : positive := 4;
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------------------------------------------------------------------------------
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-- bus data vector type
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subtype ahbDataType is std_logic_vector(ahbDataBitNb-1 downto 0);
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type ahbDataVector is array(1 to ahbSlaveNb) of ahbDataType;
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------------------------------------------------------------------------------
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-- address decoder
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type ahbMemoryLocationType is
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record
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baseAddress: natural;
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addressMask: natural;
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end record;
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type ahbMemoryLocationVector is array(1 to ahbSlaveNb) of ahbMemoryLocationType;
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------------------------------------------------------------------------------
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-- bus signals
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subtype transferType is std_ulogic_vector(ahbTransBitNb-1 downto 0);
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constant transIdle : transferType := "00";
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constant transBusy : transferType := "01";
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constant transNonSeq: transferType := "10";
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constant transSeq : transferType := "11";
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subtype transferSizeType is std_ulogic_vector(ahbSizeBitNb-1 downto 0);
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constant size8 : transferSizeType := "0";
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constant size16 : transferSizeType := "1";
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subtype burstType is std_ulogic_vector(ahbBurstBitNb-1 downto 0);
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constant burstSingle : burstType := "000";
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constant burstIncr : burstType := "001";
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constant burstWrap4 : burstType := "010";
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constant burstIncr4 : burstType := "011";
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constant burstWrap8 : burstType := "100";
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constant burstIncr8 : burstType := "101";
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constant burstWrap16 : burstType := "110";
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constant burstIncr16 : burstType := "111";
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subtype protectionType is std_ulogic_vector(ahbProtBitNb-1 downto 0);
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constant protDefault : protectionType := "0011";
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------------------------------------------------------------------------------
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-- log2
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function addressBitNb (addressNb : natural) return natural;
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END ahbLite;
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