ddr2_model_parameters.vh

DDR2 SDRAM仿真模型

    parameter TRC              =   55000; // tRC    ps    Active to Active/Auto Refresh command time
    parameter TRCD             =   15000; // tRCD   ps    Active to Read/Write command time
    parameter TRAS_MIN         =   40000; // tRAS   ps    Minimum Active to Precharge 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 TXARD            =       2; // tXARD  tCK   Exit active power down to a read command
    parameter TXP              =       2; // tXP    tCK   Exit power down to a non-read command
    parameter TANPD            =       3; // tANPD  tCK   ODT to power-down entry latency
    parameter TAXPD            =       8; // tAXPD  tCK   ODT power-down exit latency
    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 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 TRAS_MIN         =   40000; // tRAS   ps    Minimum Active to Precharge 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 TXARD            =       2; // tXARD  tCK   Exit active power down to a read command
    parameter TXP              =       2; // tXP    tCK   Exit power down to a non-read command
    parameter TANPD            =       3; // tANPD  tCK   ODT to power-down entry latency
    parameter TAXPD            =       8; // tAXPD  tCK   ODT power-down exit latency
    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 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 TRAS_MIN         =   40000; // tRAS   ps    Minimum Active to Precharge 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 TXARD            =       2; // tXARD  tCK   Exit active power down to a read command
    parameter TXP              =       2; // tXP    tCK   Exit power down to a non-read command
    parameter TANPD            =       3; // tANPD  tCK   ODT to power-down entry latency
    parameter TAXPD            =       8; // tAXPD  tCK   ODT power-down exit latency
    parameter CL_TIME          =   15000; // CL     ps    Minimum CAS Latency
`endif `endif `endif `endif `endif `endif

`ifdef x16
  `ifdef sg187E
    parameter TFAW             =   45000; // tFAW  ps     Four Bank Activate window
  `else `ifdef sg25E
    parameter TFAW             =   45000; // tFAW  ps     Four Bank Activate window
  `else `ifdef sg25
    parameter TFAW             =   45000; // tFAW  ps     Four Bank Activate window
  `else // sg3E, sg3, sg37E, sg5E
    parameter TFAW             =   50000; // tFAW  ps     Four Bank Activate window
  `endif `endif `endif
`else // x4, x8
  `ifdef sg187E
    parameter TFAW             =   35000; // tFAW  ps     Four Bank Activate window
  `else `ifdef sg25E
    parameter TFAW             =   35000; // tFAW  ps     Four Bank Activate window
  `else `ifdef sg25
    parameter TFAW             =   35000; // tFAW  ps     Four Bank Activate window
  `else // sg3E, sg3, sg37E, sg5E
    parameter TFAW             =   37500; // tFAW  ps     Four Bank Activate window
  `endif `endif `endif
`endif

    // Timing Parameters

    // Mode Register
    parameter AL_MIN           =       0; // AL     tCK   Minimum Additive Latency
    parameter AL_MAX           =       5; // AL     tCK   Maximum Additive Latency
    parameter CL_MIN           =       3; // CL     tCK   Minimum CAS Latency
    parameter CL_MAX           =       7; // CL     tCK   Maximum CAS Latency
    parameter WR_MIN           =       2; // WR     tCK   Minimum Write Recovery
    parameter WR_MAX           =       8; // WR     tCK   Maximum Write Recovery
    parameter BL_MIN           =       4; // BL     tCK   Minimum Burst Length
    parameter BL_MAX           =       8; // BL     tCK   Minimum Burst Length
    // Clock
    parameter TCK_MAX          =    8000; // tCK    ps    Maximum Clock Cycle Time
    parameter TCH_MIN          =    0.48; // tCH    tCK   Minimum Clock High-Level Pulse Width
    parameter TCH_MAX          =    0.52; // tCH    tCK   Maximum Clock High-Level Pulse Width
    parameter TCL_MIN          =    0.48; // tCL    tCK   Minimum Clock Low-Level Pulse Width
    parameter TCL_MAX          =    0.52; // tCL    tCK   Maximum Clock Low-Level Pulse Width
    // Data
    parameter TLZ              =     TAC; // tLZ    ps    Data-out low-impedance window from CK/CK#
    parameter THZ              =     TAC; // tHZ    ps    Data-out high impedance window from CK/CK#
    parameter TDIPW            =    0.35; // tDIPW  tCK   DQ and DM input Pulse Width
    // Data Strobe
    parameter TDQSH            =    0.35; // tDQSH  tCK   DQS input High Pulse Width
    parameter TDQSL            =    0.35; // tDQSL  tCK   DQS input Low Pulse Width
    parameter TDSS             =    0.20; // tDSS   tCK   DQS falling edge to CLK rising (setup time)
    parameter TDSH             =    0.20; // tDSH   tCK   DQS falling edge from CLK rising (hold time)
    parameter TWPRE            =    0.35; // tWPRE  tCK   DQS Write Preamble
    parameter TWPST            =    0.40; // tWPST  tCK   DQS Write Postamble
    parameter TDQSS            =    0.25; // tDQSS  tCK   Rising clock edge to DQS/DQS# latching transition
    // Command and Address
    parameter TIPW             =     0.6; // tIPW   tCK   Control and Address input Pulse Width
    parameter TCCD             =       2; // tCCD   tCK   Cas to Cas command delay
    parameter TRAS_MAX         =70000000; // tRAS   ps    Maximum Active to Precharge command time
    parameter TRTP             =    7500; // tRTP   ps    Read to Precharge command delay
    parameter TWR              =   15000; // tWR    ps    Write recovery time
    parameter TMRD             =       2; // tMRD   tCK   Load Mode Register command cycle time
    parameter TDLLK            =     200; // tDLLK  tCK   DLL locking time
    // Refresh
    parameter TRFC_MIN         =  127500; // tRFC   ps    Refresh to Refresh Command interval minimum value
    parameter TRFC_MAX         =70000000; // tRFC   ps    Refresh to Refresh Command Interval maximum value
    // Self Refresh
    parameter TXSNR   = TRFC_MIN + 10000; // tXSNR  ps    Exit self refesh to a non-read command
    parameter TXSRD            =     200; // tXSRD  tCK   Exit self refresh to a read command
    parameter TISXR            =     TIS; // tISXR  ps    CKE setup time during self refresh exit.
    // ODT
    parameter TAOND            =       2; // tAOND  tCK   ODT turn-on delay
    parameter TAOFD            =     2.5; // tAOFD  tCK   ODT turn-off delay
    parameter TAONPD           =    2000; // tAONPD ps    ODT turn-on (precharge power-down mode)
    parameter TAOFPD           =    2000; // tAOFPD ps    ODT turn-off (precharge power-down mode)
    parameter TMOD             =   12000; // tMOD   ps    ODT enable in EMR to ODT pin transition
    // Power Down
    parameter TCKE             =       3; // tCKE   tCK   CKE minimum high or low pulse width

    // Size Parameters based on Part Width

`ifdef x4
    parameter DM_BITS          =       1; // Set this parameter to control how many Data Mask bits are used
    parameter ADDR_BITS        =      14; // MAX Address Bits
    parameter ROW_BITS         =      14; // Set this parameter to control how many Address bits are used
    parameter COL_BITS         =      11; // Set this parameter to control how many Column bits are used
    parameter DQ_BITS          =       4; // Set this parameter to control how many Data bits are used       **Same as part bit width**
    parameter DQS_BITS         =       1; // Set this parameter to control how many Dqs bits are used
    parameter TRRD             =    7500; // tRRD   Active bank a to Active bank b command time
`else `ifdef x8
    parameter DM_BITS          =       1; // Set this parameter to control how many Data Mask bits are used
    parameter ADDR_BITS        =      14; // MAX Address B