CY7C474-20LMB datasheet(10/15 Pages) CYPRESS

Part #	CY7C474-20LMB

Description	8K x 9 FIFO, 16K x 9 FIFO 32K x 9 FIFO with Programmable Flags

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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CY7C470

CY7C472

CY7C474

10

Table 1. Flag Truth Table[13]

HF

E/F

PAFE

State

CY77C470

(8K x 9)

Number of Words

in FIFO

CY77C472

(16K x 9)

Number of Words in

FIFO

CY77C474

(32K x 9)

Number of Words in

FIFO

1

0

Empty

0

1

0

Almost Empty

1

⇒(P – 1)

1

⇒ (P – 1)

1

⇒ (P – 1)

1

Less than Half Full

P

⇒ 4096

P

⇒ 8192

P

⇒ 16384

0

1

Greater than Half Full

4097

⇒ (8192 – P)

8193

⇒ (16384 – P)

16385

⇒ (32768 – P)

0

1

0

Almost Full

(8192 – P+1)

⇒ 8191

(16384 – P+1)

⇒ 16383

(32768 – P+1)

⇒ 32767

0

Full

8192

16384

32768

Table 2. Programmable Almost Full/Empty Options[14]

D3

D2

D1

D0

PAFE Active when:

P

0

256 or less locations from Empty/Full (default)

256

0

1

16 or less locations from Empty/Full

16

0

1

0

32 or less locations from Empty/Full

32

0

1

64 or less locations from Empty/Full

64

0

1

0

128 or less locations from Empty/Full

128

0

1

0

1

256 or less locations from Empty/Full (default)

256

0

1

0

512 or less locations from Empty/Full

512

0

1

1024 or less locations from Empty/Full

1024

1

0

2048 or less locations from Empty/Full

2048

1

0

1

4098 or less locations from Empty/Full[15]

4098

1

0

1

0

8192 or less locations from Empty/Full[16]

8192

Notes:

13. See

Table 2 for P values.

14. Almost flags default to 256 locations from Empty/Full.

15. Only for CY7C472 and CY7C474.

16. Only for CY7C470.

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