參數(shù)資料
型號: LH540215
廠商: Sharp Corporation
英文描述: 512 x 18 / 1024 x 18 Synchronous FIFO
中文描述: 512 ×一千〇二十四分之一十八× 18同步FIFO
文件頁數(shù): 13/48頁
文件大?。?/td> 423K
代理商: LH540215
Table 4. Status Flags
NUMBER OF UNREAD DATA WORDS PRESENT WITHIN FIFO
1, 2
FULL
FLAG
MIDDLE FLAGS
EMPTY
FLAG
512
×
18 FIFO
1024
×
18 FIFO
FF
PAF
HF
PAE
EF
0
0
H
H
H
H
H
L
H
H
H
H
L
L
H
H
H
L
L
L
L
L
H
H
H
H
L
H
H
H
H
H
1 to q
1 to q
(q + 1) to 256
257 to (512 – (p + 1))
(512 – p) to 511
512
(q + 1) to 512
513 to (1024 – (p + 1))
(1024 – p) to 1023
1024
NOTES:
1.
q = Programmable-Almost-Empty Offset value. (Default values: 512
×
18, q = 63; 1024
×
18, q = 127.)
2.
p = Programmable-Almost-Full Offset value. (Default values: 512
×
18, p = 63; 1024
×
18, p = 127.)
3.
Only 9 (512
×
18) or 10 (1024
×
18) of the 12 offset-value-register bits should be programmed. The unneeded most-significant-end bits should
be LOW (zero).
4.
The flag output is delayed by one full clock cycle in Enhanced Operating Mode, when synchronous operation is specified for intermediate flags.
DESCRIPTION OF SIGNALS AND OPERATING SEQUENCES (cont’d)
BOLD ITALIC = Enhanced Operating Mode
512 x 18/1024 x 18 Synchronous FIFO
LH540215/25
13
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