K7A401809A

128Kx36 & 256Kx18 Synchronous SRAM

- 6 -

Rev 3.0

August 2000

K7A403609A

SYNCHRONOUS TRUTH TABLE

Notes : 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( x36)

Notes : 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

TRUTH TABLES

WRITE TRUTH TABLE(x18)

Notes : 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

OPERATION

H

H

X

X

READ

H

L

H

H

READ

H

L

L

H

WRITE BYTE a

H

L

H

L

WRITE BYTE b

H

L

L

L

WRITE ALL BYTEs

L

X

X

X

WRITE ALL BYTEs