PRELIMINARY

KM736V689/L

64Kx36 Synchronous SRAM

- 5 -

Rev 1.0

April 1997

SYNCHRONOUS TRUTH TABLE

NOTE : 1. X means "Don

′t Care".

2. The rising edge of clock is symbolized by

↑.

3. WRITE = L means Write operation in WRITE TRUTH TABLE.

WRITE = H means Read operation in WRITE TRUTH TABLE.

4. Operation finally depends on status of asynchronous input pins(ZZ and OE).

ADSP

ADSC

ADV

WRITE

CLK

Address Accessed

Operation

H

X

X

X

L

X

X

↑

N/A

Not Selected

L

L

X

L

X

X

X

↑

N/A

Not Selected

L

X

H

L

X

X

X

↑

N/A

Not Selected

L

L

X

X

L

X

X

↑

N/A

Not Selected

L

X

H

X

L

X

X

↑

N/A

Not Selected

L

H

L

L

X

X

X

↑

External Address

Begin Burst Read Cycle

L

H

L

H

L

X

L

↑

External Address

Begin Burst Write Cycle

L

H

L

H

L

X

H

↑

External Address

Begin Burst Read Cycle

X

X

X

H

H

L

H

↑

Next Address

Continue Burst Read Cycle

H

X

X

X

H

L

H

↑

Next Address

Continue Burst Read Cycle

X

X

X

H

H

L

L

↑

Next Address

Continue Burst Write Cycle

H

X

X

X

H

L

L

↑

Next Address

Continue Burst Write Cycle

X

X

X

H

H

H

H

↑

Current Address

Suspend Burst Read Cycle

H

X

X

X

H

H

H

↑

Current Address

Suspend Burst Read Cycle

X

X

X

H

H

H

L

↑

Current Address

Suspend Burst Write Cycle

H

X

X

X

H

H

L

↑

Current Address

Suspend Burst Write Cycle

WRITE TRUTH TABLE

NOTE : 1. X means "Don

′t Care".

2. All inputs in this table must meet setup and hold time around the rising edge of CLK(

↑).

GW

BW

WEa

WEb

WEc

WEd

Operation

H

H

X

X

X

X

READ

H

L

H

H

H

H

READ

H

L

L

H

H

H

WRITE BYTE a

H

L

H

L

H

H

WRITE BYTE b

H

L

H

H

L

L

WRITE BYTE c and d

H

L

L

L

L

L

WRITE ALL BYTEs

L

X

X

X

X

X

WRITE ALL BYTEs

ASYNCHRONOUS TRUTH TABLE

Operation

ZZ

OE

I/O Status

Sleep Mode

H

X

High-Z

Read

L

L

DQ

L

H

High-Z

Write

L

X

Din, High-Z

Deselected

L

X

High-Z

TRUTH TABLES

NOTE

1. X means "Don

′t Care".

2. ZZ pin is pulled down internally

3. For write cycles that following read cycles, the output buffers must

be disabled with OE, otherwise data bus contention will occur.

4. Sleep Mode means power down state of which stand-by current

does not depend on cycle time.

5. Deselected means power down state of which stand-by current

depends on cycle time.