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MC-4R256CEE6B Datasheet(PDF) 11 Page - NEC |
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MC-4R256CEE6B Datasheet(HTML) 11 Page - NEC |
11 / 16 page Preliminary Data Sheet M14541EJ1V1DS00 11 MC-4R256CEE6B, 4R256CEE6C Timing Parameters The following timing parameters are from the RDRAMs pins, not the RIMM. Please refer to the RDRAM data sheet ( µPD488448, 488488) for detailed timing diagrams. Para- Description MIN. MAX. Units meter -845 -745 -653 tRC Row Cycle time of RDRAM banks - the interval between ROWA packets with ACT commands to the same bank. 28 28 28 — tCYCLE tRAS RAS-asserted time of RDRAM bank - the interval between ROWA packet with ACT command and next ROWR packet with PRER Note 1 command to the same bank. 20 20 20 Note 2 64 µs tCYCLE tRP Row Precharge time of RDRAM banks - the interval between ROWR packet with PRER Note 1 command and next ROWA packet with ACT command to the same bank. 888 — tCYCLE tPP Precharge-to-precharge time of RDRAM device - the interval between successive ROWR packets with PRER Note 1 commands to any banks of the same device. 888 — tCYCLE tRR RAS-to-RAS time of RDRAM device - the interval between successive ROWA packets with ACT commands to any banks of the same device. 888 — tCYCLE tRCD RAS-to-CAS Delay - the interval from ROWA packet with ACT command to COLC packet with RD or WR command. Note - the RAS-to-CAS delay seen by the RDRAM core (tRCD-C) is equal to tRCD-C = 1 + tRCD because of differences in the row and column paths through the RDRAM interface. 977 — tCYCLE tCAC CAS Access delay - the interval from RD command to Q read data. The equation for tCAC is given in the TPARM register. 888 12 tCYCLE tCWD CAS Write Delay - interval from WR command to D write data. 6 6 6 6 tCYCLE tCC CAS-to-CAS time of RDRAM bank - the interval between successive COLC commands. 444 — tCYCLE tPACKET Length of ROWA, ROWR, COLC, COLM or COLX packet. 4 4 4 4 tCYCLE tRTR Interval from COLC packet with WR command to COLC packet which causes retire, and to COLM packet with bytemask. 888 — tCYCLE tOFFP The interval (offset) from COLC packet with RDA command, or from COLC packet with retire command (after WRA automatic precharge), or from COLC packet with PREC command, or from COLX packet with PREX command to the equivalent ROWR packet with PRER. The equation for tOFFP is given in the TPARM register. 444 4 tCYCLE tRDP Interval from last COLC packet with RD command to ROWR packet with PRER. 444 — tCYCLE tRTP Interval from last COLC packet with automatic retire command to ROWR packet with PRER. 444 — tCYCLE Notes 1. Or equivalent PREC or PREX command. 2. This is a constraint imposed by the core, and is therefore in units of ms rather than tCYCLE. |
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