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參數(shù)資料
| 型號： | CY7C454 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 4Kx9 Cascadable Clocked FIFOs with Programmable Flags(帶可編程標(biāo)記的4Kx9可級聯(lián)定時(shí)的先進(jìn)先出) |
| 中文描述： | 4Kx9級聯(lián)與時(shí)鐘FIFO的可編程標(biāo)志（帶可編程標(biāo)記的4Kx9可級聯(lián)定時(shí)的先進(jìn)先出） |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 437K |
| 代理商： | CY7C454 |
CY7C451
CY7C453
CY7C454
15
PRELIMINARY
Notes:
40. In this example, the FIFO is assumed to be programmed to check for even parity.
41. This example assumes that the time from the CKR rising edge to valid word M+1 > t
.
42. If ENR was HIGH around the rising edge of CKR (i.e., read disabled), the valid data at the far right would once again be word M instead of word M+1.
43. Clocks are free running in this case.
44. The flags may change state during Retransmit as a result of the offset of the read and write pointers, but flags will be valid at t
RTR
.
Switching Waveforms
(continued)
WORD M:
EVEN NUMBER
OF “1”s
Even Parity Checking
Output Enable Timing
WRITE M
C451-23
1
PE
READ M
WRITE M+1
WRITE M+2
WORD M+ 1:
ODD NUMBER
OF “1”s
WORD M+ 2:
EVEN NUMBER
OF “1”s
READ M+1
READ M+2
t
PE
t
PE
8 LSBs OF
8 LSBs OF
WORD M
8 LSBs OF
Q
8
/F
CKW
CKR
ENW
ENR
D
0– 8
Q
0– 7
VWORD M
READ M+1
CKR
Q
0– 8
OE
ENR
t
OHZ
t
OE
t
OLZ
VALID DATA
C451-24
LOW
[40]
[41,42]
Retransmit Timing
ENR/ENW
FL/RT
t
PRT
t
RTR
C451–25
E/F,HF,PAFE
[43, 44]
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