V58C2256 datasheet(21/61 Pages) MOSEL

Numer części	V58C2256

Szczegółowy opis	HIGH PERFORMANCE 2.5 VOLT 256 Mbit DDR SDRAM

PDF	61 Pages

Scroll/Zoom	100%

Producent	MOSEL [Mosel Vitelic, Corp]

Strona internetowa	http://www.moselvitelic.com

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MOSEL VITELIC

V58C2256(804/404/164)S

V58C2256(804/404/164)S Rev. 1.4 October 2002

Precharge Timing During Write Operation

Precharge timing for Write operations in DRAMs requires enough time to satisfy the write recovery require-

ment. This is the time required by a DRAM sense amp to fully store the voltage level. For DDR SDRAMs, a

timing parameter (t

WR) is used to indicate the required amount of time between the last valid write operation

and a Precharge command to the same bank.

The “write recovery” operation begins on the rising clock edge after the last DQS edge that is used to strobe

in the last valid write data. “Write recovery” is complete on the next 2nd rising clock edge that is used to strobe

in the Precharge command.

Write with Precharge Timing

(CAS Latency = Any; Burst Length = 4)

NOP

Write

NOP

PreA

NOP

CK, CK

Command

DQS

tRAS(min)

tRP(min)

NOP

T10

tWR

DQS

tWR

V58C2256 Arkusz danych(PDF) 21 Page - Mosel Vitelic, Corp