?? ddr2_model_parameters.vh
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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 `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 = 6; // CL tCK Maximum CAS Latency parameter WR_MIN = 2; // WR tCK Minimum Write Recovery parameter WR_MAX = 6; // 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 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_MIN = 40000; // tRAS ps Minimum Active to Precharge command time 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 = 105000; // 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 TANPD = 3; // tANPD tCK ODT to power-down entry latency parameter TAXPD = 8; // tAXPD tCK ODT power-down exit latency parameter TMOD = 12000; // tMOD ps ODT enable in EMR to ODT pin transition // Power Down 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 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 parameter TFAW = 37500; // tFAW Four access window time for the number of activates in an 8 bank device 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?? 快捷鍵說明
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