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: 1.01c 8/2017

9/30

© 2011, GSI Technology

GS8342DT06/11/20/38BD-550/500/450/400/350

Byte Write Clock Truth Table

BW

BW

BW

BW

Current Operation

D

D

D

D

K



K



K



K



K



K



K



K



K



T

T

T

T

Write

Dx stored if BWn = 0 in all four data transfers

D0

D2

D3

D4

T

F

F

F

Write

Dx stored if BWn = 0 in 1st data transfer only

D0

X

X

X

F

T

F

F

Write

Dx stored if BWn = 0 in 2nd data transfer only

X

D1

X

X

F

F

T

F

Write

Dx stored if BWn = 0 in 3rd data transfer only

X

X

D2

X

F

F

F

T

Write

Dx stored if BWn = 0 in 4th data transfer only

X

X

X

D3

F

F

F

F

Write Abort

No Dx stored in any of the four data transfers

X

X

X

X

Notes:

1. “1” = input “high”; “0” = input “low”; “X” = input “don’t care”; “T” = input “true”; “F” = input “false”.

2. If one or more BWn = 0, then BW = “T”, else BW = “F”.