CY7C1327G

Document Number: 38-05519 Rev. *M

Page 7 of 23

Truth Table

The Truth Table for CY7C1327G follows. [3, 4, 5, 6, 7]

Next Cycle

Add. Used

OE

DQ

WRITE

Unselected

None

H

X

X

L

X

L

X

X

Tri-state

X

Unselected

None

L

X

H

L

L

X

X

X

Tri-state

X

Unselected

None

L

L

X

L

L

X

X

X

Tri-state

X

Unselected

None

L

X

H

L

H

L

X

X

Tri-state

X

Unselected

None

L

L

X

L

H

L

X

X

Tri-state

X

Begin read

External

L

H

L

L

L

X

X

X

Tri-state

X

Begin read

External

L

H

L

L

H

L

X

X

Tri-state

H

Continue read

Next

X

X

X

L

H

H

L

H

Tri-state

H

Continue read

Next

X

X

X

L

H

H

L

L

DQ

H

Continue read

Next

H

X

X

L

X

H

L

H

Tri-state

H

Continue read

Next

H

X

X

L

X

H

L

L

DQ

H

Suspend read

Current

X

X

X

L

HHHH

Tri-state

H

Suspend read

Current

X

X

X

L

H

H

H

L

DQ

H

Suspend read

Current

H

X

X

L

X

H

H

H

Tri-state

H

Suspend read

Current

H

X

X

L

X

H

H

L

DQ

H

Begin write

Current

X

X

X

L

H

H

H

X

Tri-state

L

Begin write

Current

H

X

X

L

X

H

H

X

Tri-state

L

Begin write

External

L

H

L

L

H

H

X

X

Tri-state

L

Continue write

Next

X

X

X

L

H

H

H

X

Tri-state

L

Continue write

Next

H

X

X

L

X

H

H

X

Tri-state

L

Suspend write

Current

X

X

X

L

H

H

H

X

Tri-state

L

Suspend write

Current

H

X

X

L

X

H

H

X

Tri-state

L

ZZ “sleep”

None

X

X

X

H

XXXX

Tri-state

X

Notes

3. X = “Don't Care.” H = Logic HIGH, L = Logic LOW.

GW = H.

5. The DQ pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.

the ADSP or with the assertion of ADSC. As a result, OE must be driven HIGH prior to the start of the write cycle to allow the outputs to tristate. OE is a don't care for

the remainder of the write cycle.

7. OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle all data bits are tristate when OE is inactive

or when the device is deselected, and all data bits behave as output when OE is active (LOW).