CY7C25652KV18-550BZC データシートの表示（PDF） - Cypress Semiconductor

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CY7C25652KV18-550BZC

72-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency) with ODT

Cypress Semiconductor 

CY7C25632KV18

CY7C25652KV18

Truth Table

The truth table for CY7C25632KV18, and CY7C25652KV18 follows. [4, 5, 6, 7, 8, 9]

Operation

Write Cycle:

Load address on the

rising edge of K; input

write data on two

consecutive K and K

rising edges.

Read Cycle:

(2.5 cycle Latency)

Load address on the

rising edge of K; wait two

and half cycles; read data

on two consecutive K and

K rising edges.

K RPS WPS

DQ

DQ

DQ

DQ

L–H H [10] L [11] D(A) at K(t + 1) D(A + 1) at K(t + 1) D(A + 2) at K(t + 2) D(A + 3) at K(t + 2)

L–H L [11] X Q(A) at K(t + 2) Q(A + 1) at K(t + 3) Q(A + 2) at K(t + 3) Q(A + 3) at K(t + 4)

NOP: No Operation

L–H H H D = X

Q = High Z

D=X

Q = High Z

D=X

Q = High Z

D=X

Q = High Z

Standby: Clock Stopped Stopped X X Previous State Previous State

Previous State

Previous State

Notes

4. X = “Don't Care,” H = Logic HIGH, L = Logic LOW, represents rising edge.

5. Device powers up deselected with the outputs in a tri-state condition.

6. “A” represents address location latched by the devices when transaction was initiated. A + 1, A + 2, and A + 3 represents the address sequence in the burst.

7. “t” represents the cycle at which a read/write operation is started. t + 1, t + 2, and t + 3 are the first, second and third clock cycles respectively succeeding the “t” clock cycle.

8. Data inputs are registered at K and K rising edges. Data outputs are delivered on K and K rising edges as well.

9. Ensure that when clock is stopped K = K and C = C = HIGH. This is not essential, but permits most rapid restart by overcoming transmission line charging symmetrically.

10. If this signal was LOW to initiate the previous cycle, this signal becomes a “Don’t Care” for this operation.

11. This signal was HIGH on previous K clock rise. Initiating consecutive read or write operations on consecutive K clock rises is not permitted. The device ignores the

second read or write request.

Document Number: 001-66482 Rev. *D

Page 9 of 31

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