AT43101 Просмотр технического описания (PDF) - Atmel Corporation

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AT43101

PCMCIA Card Memory Interface Circuit with 256 Bytes of Internal Attribute Memory EEPROM

Atmel Corporation 

AT43101

Memory Access Functions

Mode

REG*

Standby

X

Byte Read, Even

H or L

Byte Read, Odd

H only

Word Read

H only

Odd byte only Read

H only

Byte Write, Even

H or L

Byte Wrtite, Odd

H only

Word Write

H only

Odd byte only Write

H only

CE2*

H

H

H

L

L

H

H

L

L

CE1*

H

L

L

L

H

L

L

L

H

The E2PROM includes address and data latches which are

clocked at the leading edge of the effective write pulse that

results from the gating of the PCMCIA control signals. The

Tsu(CE), Tsu(REG), Tsu(WE) timing parameters shown in

the AC Write Characteristics guarantee adequate pulse

width for the latch clock signals. The actual write is trig-

A0

OE*

WE* D[15:8] D[7:0]

X

X

X

High Z High Z

L

L

H

High Z D(Even)

H

L

H

High Z D(Odd)

X

L

H

D(Odd) D(Even)

X

L

H

D(Odd) High Z

L

H

L

X

D(Even)

H

H

L

X

D(Odd)

X

H

L

D(Odd) D(Even)

X

H

L

D(Odd)

X

gered by the rising edge of the first of WE* or CE1* to go

high. Writes to the E2PROM Attribute Memory must

observe either a 10 ms. write recovery/cycle time or wait

until R/B* goes inactive before another write can be initiated.

7

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