CY7C474 データシートの表示（PDF） - Cypress Semiconductor
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CY7C474 Datasheet PDF : 15 Pages
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CY7C470
CY7C472
CY7C474
Table 1. Flag Truth Table[13]
HF E/F PAFE
State
1
0
0 Empty
1
1
0 Almost Empty
1
1
1 Less than Half Full
0
1
1 Greater than Half Full
0
1
0 Almost Full
0
0
0 Full
CY77C470
(8K x 9)
Number of Words
in FIFO
0
1 ⇒(P – 1)
P ⇒ 4096
4097 ⇒ (8192 – P)
(8192 – P+1) ⇒ 8191
8192
CY77C472
(16K x 9)
Number of Words in
FIFO
0
1 ⇒ (P – 1)
P ⇒ 8192
8193 ⇒ (16384 – P)
(16384 – P+1) ⇒ 16383
16384
CY77C474
(32K x 9)
Number of Words in
FIFO
0
1 ⇒ (P – 1)
P ⇒ 16384
16385 ⇒ (32768 – P)
(32768 – P+1) ⇒ 32767
32768
Table 2. Programmable Almost Full/Empty Options[14]
D3
D2
D1
D0 PAFE Active when:
0
0
0
0 256 or less locations from Empty/Full (default)
0
0
0
1 16 or less locations from Empty/Full
0
0
1
0 32 or less locations from Empty/Full
0
0
1
1 64 or less locations from Empty/Full
0
1
0
0 128 or less locations from Empty/Full
0
1
0
1 256 or less locations from Empty/Full (default)
0
1
1
0 512 or less locations from Empty/Full
0
1
1
1 1024 or less locations from Empty/Full
1
0
0
0 2048 or less locations from Empty/Full
1
0
0
1
4098 or less locations from Empty/Full[15]
1
0
1
0
8192 or less locations from Empty/Full[16]
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.
P
256
16
32
64
128
256
512
1024
2048
4098
8192
10
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