UPD45128841 datasheet(30/92 Pages) NEC

部件名	UPD45128841

功能描述	128M-bit Synchronous DRAM 4-bank, LVTTL

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制造商	NEC [NEC]

网页	http://www.nec.com/

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30 / 92 page

Data Sheet M12650EJBV0DS00

30

µµµµPD45128441, 45128841, 45128163

11.4 Read to Write Command Interval

During a read cycle, READ can be interrupted by WRITE.

The Read and Write command interval is 1 cycle minimum. There is a restriction to avoid data conflict. The Data

bus must be Hi-Z using DQM before WRITE.

D1

D2

D3

D4

READ

DQ

Command

CLK

T0

T2

T1

T3

T4

T5

T6

T7

T8

Burst length = 4

WRITE

DQM

Hi-Z

1cycle

READ can be interrupted by WRITE. DQM must be High at least 3 clocks prior to the Write command.

CLK

T0

T2

T1

T3

T4

T5

T6

T7

T8

Burst length = 8

T9

Q1

Q2

Q3

READ

DQ

Command

D1

D2

D3

WRITE

DQM

Hi-Z is

necessary

Q1

Q2

READ

DQ

Command

D1

D2

D3

WRITE

DQM

Hi-Z is

necessary

/CAS latency = 2

/CAS latency = 3

类似零件编号 - UPD45128841

制造商	部件名	数据表	功能描述
Elpida Memory	UPD45128163-A75L	821Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL
	UPD45128163-E	932Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL
	UPD45128163-I	785Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	UPD45128163-I-E	962Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	UPD45128163-T	774Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)

More results

类似说明 - UPD45128841

制造商	部件名	数据表	功能描述
Elpida Memory	UPD45128163-E	932Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL
	UPD45128163-A75L	821Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL
	PD45128441-T	713Kb / 89P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	UPD45128163-I	785Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	UPD45128163-T	774Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	PD45128441-I	710Kb / 89P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	PD45128163-SU	701Kb / 87P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
	UPD45128163-I-E	962Kb / 86P	128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)
NEC	UPD4564323	1Mb / 84P	64M-bit Synchronous DRAM 4-bank, LVTTL
Elpida Memory	UPD4564163	919Kb / 85P	64M-bit Synchronous DRAM 4-bank, LVTTL