ddr2_model_parameters.vh

DDR2 SDRAM仿真模型

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    // Timing parameters based on Speed Grade

                                          // SYMBOL UNITS DESCRIPTION
                                          // ------ ----- -----------
`ifdef x256Mb

`ifdef sg25E
    parameter TCK_MIN          =    2500; // tCK    ps    Minimum Clock Cycle Time
    parameter TJIT_PER         =     100; // tJIT(per)  ps Period JItter
    parameter TJIT_DUTY        =     100; // tJIT(duty) ps Half Period Jitter
    parameter TJIT_CC          =     200; // tJIT(cc)   ps Cycle to Cycle jitter
    parameter TERR_2PER        =     150; // tERR(nper) ps Accumulated Error (2-cycle)
    parameter TERR_3PER        =     175; // tERR(nper) ps Accumulated Error (3-cycle)
    parameter TERR_4PER        =     200; // tERR(nper) ps Accumulated Error (4-cycle)
    parameter TERR_5PER        =     200; // tERR(nper) ps Accumulated Error (5-cycle)
    parameter TERR_N1PER       =     300; // tERR(nper) ps Accumulated Error (6-10-cycle)
    parameter TERR_N2PER       =     450; // tERR(nper) ps Accumulated Error (11-50-cycle)
    parameter TQHS             =     300; // tQHS   ps    Data hold skew factor
    parameter TAC              =     400; // tAC    ps    DQ output access time from CK/CK#
    parameter TDS              =      50; // tDS    ps    DQ and DM input setup time relative to DQS
    parameter TDH              =     125; // tDH    ps    DQ and DM input hold time relative to DQS
    parameter TDQSCK           =     350; // tDQSCK ps    DQS output access time from CK/CK#
    parameter TDQSQ            =     200; // tDQSQ  ps    DQS-DQ skew, DQS to last DQ valid, per group, per access
    parameter TWPRE            =    0.35; // tWPRE  tCK   DQS Write Preamble
    parameter TIS              =     200; // tIS    ps    Input Setup Time
    parameter TIH              =     275; // tIH    ps    Input Hold Time
    parameter TRC              =   55000; // tRC    ps    Active to Active/Auto Refresh command time
    parameter TRCD             =   12000; // tRCD   ps    Active to Read/Write command time
    parameter TWTR             =    7500; // tWTR   ps    Write to Read command delay
    parameter TRP              =   12500; // tRP    ps    Precharge command period
    parameter TXARDS           =       8; // tXARDS tCK   Exit low power active power down to a read command
    parameter CL_TIME          =   12500; // CL     ps    Minimum CAS Latency
`else `ifdef sg3E
    parameter TCK_MIN          =    3000; // tCK    ps    Minimum Clock Cycle Time
    parameter TJIT_PER         =     125; // tJIT(per)  ps Period JItter
    parameter TJIT_DUTY        =     125; // tJIT(duty) ps Half Period Jitter
    parameter TJIT_CC          =     250; // tJIT(cc)   ps Cycle to Cycle jitter
    parameter TERR_2PER        =     175; // tERR(nper) ps Accumulated Error (2-cycle)
    parameter TERR_3PER        =     225; // tERR(nper) ps Accumulated Error (3-cycle)
    parameter TERR_4PER        =     250; // tERR(nper) ps Accumulated Error (4-cycle)
    parameter TERR_5PER        =     250; // tERR(nper) ps Accumulated Error (5-cycle)
    parameter TERR_N1PER       =     350; // tERR(nper) ps Accumulated Error (6-10-cycle)
    parameter TERR_N2PER       =     450; // tERR(nper) ps Accumulated Error (11-50-cycle)
    parameter TQHS             =     340; // tQHS   ps    Data hold skew factor
    parameter TAC              =     450; // tAC    ps    DQ output access time from CK/CK#
    parameter TDS              =     100; // tDS    ps    DQ and DM input setup time relative to DQS
    parameter TDH              =     175; // tDH    ps    DQ and DM input hold time relative to DQS
    parameter TDQSCK           =     400; // tDQSCK ps    DQS output access time from CK/CK#
    parameter TDQSQ            =     240; // tDQSQ  ps    DQS-DQ skew, DQS to last DQ valid, per group, per access
    parameter TWPRE            =    0.35; // tWPRE  tCK   DQS Write Preamble
    parameter TIS              =     200; // tIS    ps    Input Setup Time
    parameter TIH              =     275; // tIH    ps    Input Hold Time
    parameter TRC              =   54000; // tRC    ps    Active to Active/Auto Refresh command time
    parameter TRCD             =   12000; // tRCD   ps    Active to Read/Write command time
    parameter TWTR             =    7500; // tWTR   ps    Write to Read command delay
    parameter TRP              =   12000; // tRP    ps    Precharge command period
    parameter TXARDS           =       7; // tXARDS tCK   Exit low power active power down to a read command
    parameter CL_TIME          =   12000; // CL     ps    Minimum CAS Latency
`else `ifdef sg3
    parameter TCK_MIN          =    3000; // tCK    ps    Minimum Clock Cycle Time
    parameter TJIT_PER         =     125; // tJIT(per)  ps Period JItter
    parameter TJIT_DUTY        =     125; // tJIT(duty) ps Half Period Jitter
    parameter TJIT_CC          =     250; // tJIT(cc)   ps Cycle to Cycle jitter
    parameter TERR_2PER        =     175; // tERR(nper) ps Accumulated Error (2-cycle)
    parameter TERR_3PER        =     225; // tERR(nper) ps Accumulated Error (3-cycle)
    parameter TERR_4PER        =     250; // tERR(nper) ps Accumulated Error (4-cycle)
    parameter TERR_5PER        =     250; // tERR(nper) ps Accumulated Error (5-cycle)
    parameter TERR_N1PER       =     350; // tERR(nper) ps Accumulated Error (6-10-cycle)
    parameter TERR_N2PER       =     450; // tERR(nper) ps Accumulated Error (11-50-cycle)
    parameter TQHS             =     340; // tQHS   ps    Data hold skew factor
    parameter TAC              =     450; // tAC    ps    DQ output access time from CK/CK#
    parameter TDS              =     100; // tDS    ps    DQ and DM input setup time relative to DQS
    parameter TDH              =     175; // tDH    ps    DQ and DM input hold time relative to DQS
    parameter TDQSCK           =     400; // tDQSCK ps    DQS output access time from CK/CK#
    parameter TDQSQ            =     240; // tDQSQ  ps    DQS-DQ skew, DQS to last DQ valid, per group, per access
    parameter TWPRE            =    0.35; // tWPRE  tCK   DQS Write Preamble
    parameter TIS              =     200; // tIS    ps    Input Setup Time
    parameter TIH              =     275; // tIH    ps    Input Hold Time
    parameter TRC              =   55000; // tRC    ps    Active to Active/Auto Refresh command time
    parameter TRCD             =   15000; // tRCD   ps    Active to Read/Write command time
    parameter TWTR             =    7500; // tWTR   ps    Write to Read command delay
    parameter TRP              =   15000; // tRP    ps    Precharge command period
    parameter TXARDS           =       7; // tXARDS tCK   Exit low power active power down to a read command
    parameter CL_TIME          =   15000; // CL     ps    Minimum CAS Latency
`else `ifdef sg37E
    parameter TCK_MIN          =    3750; // tCK    ps    Minimum Clock Cycle Time
    parameter TJIT_PER         =     125; // tJIT(per)  ps Period JItter
    parameter TJIT_DUTY        =     125; // tJIT(duty) ps Half Period Jitter
    parameter TJIT_CC          =     250; // tJIT(cc)   ps Cycle to Cycle jitter
    parameter TERR_2PER        =     175; // tERR(nper) ps Accumulated Error (2-cycle)
    parameter TERR_3PER        =     225; // tERR(nper) ps Accumulated Error (3-cycle)
    parameter TERR_4PER        =     250; // tERR(nper) ps Accumulated Error (4-cycle)
    parameter TERR_5PER        =     250; // tERR(nper) ps Accumulated Error (5-cycle)
    parameter TERR_N1PER       =     350; // tERR(nper) ps Accumulated Error (6-10-cycle)
    parameter TERR_N2PER       =     450; // tERR(nper) ps Accumulated Error (11-50-cycle)
    parameter TQHS             =     400; // tQHS   ps    Data hold skew factor
    parameter TAC              =     500; // tAC    ps    DQ output access time from CK/CK#
    parameter TDS              =     100; // tDS    ps    DQ and DM input setup time relative to DQS
    parameter TDH              =     225; // tDH    ps    DQ and DM input hold time relative to DQS
    parameter TDQSCK           =     450; // tDQSCK ps    DQS output access time from CK/CK#
    parameter TDQSQ            =     300; // tDQSQ  ps    DQS-DQ skew, DQS to last DQ valid, per group, per access
    parameter TWPRE            =    0.25; // tWPRE  tCK   DQS Write Preamble
    parameter TIS              =     250; // tIS    ps    Input Setup Time
    parameter TIH              =     375; // tIH    ps    Input Hold Time
    parameter TRC              =   55000; // tRC    ps    Active to Active/Auto Refresh command time
    parameter TRCD             =   15000; // tRCD   ps    Active to Read/Write command time
    parameter TWTR             =    7500; // tWTR   ps    Write to Read command delay
    parameter TRP              =   15000; // tRP    ps    Precharge command period
    parameter TXARDS           =       6; // tXARDS tCK   Exit low power active power down to a read command
    parameter CL_TIME          =   15000; // CL     ps    Minimum CAS Latency
`else `define sg5E
    parameter TCK_MIN          =    5000; // tCK    ps    Minimum Clock Cycle Time
    parameter TJIT_PER         =     125; // tJIT(per)  ps Period JItter
    parameter TJIT_DUTY        =     150; // tJIT(duty) ps Half Period Jitter
    parameter TJIT_CC          =     250; // tJIT(cc)   ps Cycle to Cycle jitter
    parameter TERR_2PER        =     175; // tERR(nper) ps Accumulated Error (2-cycle)
    parameter TERR_3PER        =     225; // tERR(nper) ps Accumulated Error (3-cycle)
    parameter TERR_4PER        =     250; // tERR(nper) ps Accumulated Error (4-cycle)
    parameter TERR_5PER        =     250; // tERR(nper) ps Accumulated Error (5-cycle)
    parameter TERR_N1PER       =     350; // tERR(nper) ps Accumulated Error (6-10-cycle)
    parameter TERR_N2PER       =     450; // tERR(nper) ps Accumulated Error (11-50-cycle)
    parameter TQHS             =     450; // tQHS   ps    Data hold skew factor
    parameter TAC              =     600; // tAC    ps    DQ output access time from CK/CK#
    parameter TDS              =     150; // tDS    ps    DQ and DM input setup time relative to DQS
    parameter TDH              =     275; // tDH    ps    DQ and DM input hold time relative to DQS
    parameter TDQSCK           =     500; // tDQSCK ps    DQS output access time from CK/CK#
    parameter TDQSQ            =     350; // tDQSQ  ps    DQS-DQ skew, DQS to last DQ valid, per group, per access
    parameter TWPRE            =    0.25; // tWPRE  tCK   DQS Write Preamble
    parameter TIS              =     350; // tIS    ps    Input Setup Time
    parameter TIH              =     475; // tIH    ps    Input Hold Time
    parameter TRC              =   55000; // tRC    ps    Active to Active/Auto Refresh command time
    parameter TRCD             =   15000; // tRCD   ps    Active to Read/Write command time
    parameter TWTR             =   10000; // tWTR   ps    Write to Read command delay
    parameter TRP              =   15000; // tRP    ps    Precharge command period
    parameter TXARDS           =       6; // tXARDS tCK   Exit low power active power down to a read command
    parameter CL_TIME          =   15000; // CL     ps    Minimum CAS Latency
`endif `endif `endif `endif