CY7C457 datasheet(10/23 Pages) CYPRESS

Part #	CY7C457

Description	512 x 18, 1K x 18, and 2K x 18 Cascadable Clocked FIFOs with Programmable Flags

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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CY7C455

CY7C456

CY7C457

Document #: 38-06003 Rev. *A

Page 10 of 23

Notes:

27. The FIFO in this example is assumed to be programmed to its default flag values. Almost Empty is 16 words from Empty; Almost Full is 16 locations from Full.

28. R4 only updates the flag status. It does not affect the count because ENR is HIGH.

29. When making the transition from Almost Empty to Intermediate, the count must increase by two (16 Á18; two enabled writes: W2, W3) before a read (R4)

can update flags to the Less Than Half Full state.

Switching Waveforms (continued)

Read to Almost Empty Timing Diagram with Free-Running Clocks

Read to Almost Empty Timing Diagram with Read Flag Update Cycle with Free-Running Clocks

tSKEW1

tSKEW2

tFD

17

16

18

16

ENABLED

READ

17

15

ENABLED

WRITE

18

16

tSKEW2

tFD

FLAG

UPDATE

ENABLED

READ

ENABLED

READ

17

15

ENABLED

READ

FLAG UPDATE CYCLE

c455-13

c455-14

HIGH

R1

R2

R3

ENABLED

READ

R4

ENABLED

READ

R5

ENABLED

READ

R6

W2

ENABLED

WRITE

W3

W4

W1

W5

W6

R2

R3

R4

R5

R6

R7

ENABLED

WRITE

W2

ENABLED

WRITE

W3

W4

W5

W6

W7

18 (no change)

W1

COUNT

ENR

ENW

E/F

PAFE

HF

CKW

17

16

tSKEW1

tFD

ENR

ENW

PAFE

ENABLED

READ

HF

E/F

HIGH

R1

W1

COUNT

CKR

CKW

[22, 25, 27]

[22, 25, 27, 28, 29]

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