Separate I/O SigmaQuad II+ B4 SRAM Truth Table

Previous

Operation

A

R

W

Current

Operation

D

D

D

D

Q

Q

Q

Q

K



K



K



K



K



K



K



K



K



K



K



K



K



Deselect

X

1

1

Deselect

X

X

—

—

Hi-Z

Hi-Z

—

—

Write

X

1

X

Deselect

D2

D3

—

—

Hi-Z

Hi-Z

—

—

Read

X

X

1

Deselect

X

X

—

—

Q2

Q3

—

—

Deselect

V

1

0

Write

D0

D1

D2

D3

Hi-Z

Hi-Z

—

—

Deselect

V

0

X

Read

X

X

—

—

Q0

Q1

Q2

Q3

Read

V

X

0

Write

D0

D1

D2

D3

Q2

Q3

—

—

Write

V

0

X

Read

D2

D3

—

—

Q0

Q1

Q2

Q3

Notes:

1. “1” = input “high”; “0” = input “low”; “V” = input “valid”; “X” = input “don’t care”

2. “—” indicates that the input requirement or output state is determined by the next operation.

3. Q0, Q1, Q2, and Q3 indicate the first, second, third, and fourth pieces of output data transferred during Read operations.

4. D0, D1, D2, and D3 indicate the first, second, third, and fourth pieces of input data transferred during Write operations.

5. Users should not clock in metastable addresses.

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.

Rev: 1.05c 8/2017

9/31

© 2011, GSI Technology

GS81302D06/11/20/38E-500/450/400/350