UPD30121 datasheet(43/76 Pages) NEC

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Data Sheet U14691EJ1V0DS00

µµµµPD30121

(7)

DRAM refresh parameter

The target DRAM is the

µPD42S161615L-A60, 42S18165L-A60, 42S64165G5-A50, 42S64165G5-A60,

42S65165G5-A50, or 42S65165G5-A60.

(a) CAS-before-RAS refresh parameter

Parameter

Symbol

Condition

MIN.

MAX.

Unit

Read/write cycle time

tRC

104

MRAS (0:3)# pulse width

tRAS

MRAS (0:3)# precharge time

tRP

UCAS#/LCAS# setup time (to MRAS (0:3)#

↓)tCSR

5ns

UCAS#/LCAS# hold time (from MRAS (0:3)#

↓)tCHR

MRAS (0:3)# precharge time from

UCAS#/LCAS#

↑

tCRP

5ns

UCAS#/LCAS# precharge time

tCPN

MRAS (0:3)#

Note 1

(output)

UCAS#/LCAS#

Note 2

(output)

WR#

(output)

tCSR

tRAS

tCHR

tRP

tCRP

tCPN

tRC

Notes 1. In 32-bit mode: Applied to MRAS (0:1)# pins

In 16-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#/MRAS2#, and MRAS (0:1)# pins

2. In 32-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#MRAS2#, UCAS#, and LCAS# pins

In 16-bit mode: Applied to UCAS# and LCAS# pins

UPD30121 Datasheet(PDF) 43 Page - NEC

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