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MC-4R256CEE6C View Datasheet(PDF) - NEC => Renesas Technology

Part Name
Description
Manufacturer
MC-4R256CEE6C Datasheet PDF : 16 Pages
First Prev 11 12 13 14 15 16
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.
meter
-845 -745 -653
tRC
Row Cycle time of RDRAM banks - the interval between ROWA packets with 28 28 28 —
ACT commands to the same bank.
tRAS
RAS-asserted time of RDRAM bank - the interval between ROWA packet with ACT 20
20
20
Note 2
64µs
command and next ROWR packet with PRER Note 1 command to the same bank.
tRP
Row Precharge time of RDRAM banks - the interval between ROWR packet with
8
8
8
PRER Note 1 command and next ROWA packet with ACT command to the same
bank.
tPP
Precharge-to-precharge time of RDRAM device - the interval between
successive ROWR packets with PRER Note1 commands to any banks of the
same device.
8
8
8
tRR
RAS-to-RAS time of RDRAM device - the interval between successive ROWA 8
8
8
packets with ACT commands to any banks of the same device.
tRCD
RAS-to-CAS Delay - the interval from ROWA packet with ACT command to
9
7
7
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.
tCAC
CAS Access delay - the interval from RD command to Q read data. The
equation for tCAC is given in the TPARM register.
tCWD CAS Write Delay - interval from WR command to D write data.
8
8
8
12
6
6
6
6
tCC
CAS-to-CAS time of RDRAM bank - the interval between successive COLC
4
4
4
commands.
tPACKET Length of ROWA, ROWR, COLC, COLM or COLX packet.
4
4
4
4
tRTR
Interval from COLC packet with WR command to COLC packet which causes 8
8
8
retire, and to COLM packet with bytemask.
tOFFP The interval (offset) from COLC packet with RDA command, or from COLC
4
4
4
4
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.
tRDP
Interval from last COLC packet with RD command to ROWR packet with
PRER.
4
4
4
tRTP
Interval from last COLC packet with automatic retire command to ROWR
packet with PRER.
4
4
4
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.
Units
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
tCYCLE
Preliminary Data Sheet M14541EJ1V1DS00
11
 

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