Figure 4. Programmable Flag Offset Progra" />
參數(shù)資料
型號(hào): IDT72291L20TFI
廠(chǎng)商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 26/26頁(yè)
文件大?。?/td> 0K
描述: IC FIFO 65536X18 LP 20NS 64QFP
標(biāo)準(zhǔn)包裝: 80
系列: 7200
功能: 同步
存儲(chǔ)容量: 1.1M(65K x 18)
數(shù)據(jù)速率: 50MHz
訪(fǎng)問(wèn)時(shí)間: 20ns
電源電壓: 4.5 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 64-LQFP
供應(yīng)商設(shè)備封裝: 64-TQFP(10x10)
包裝: 托盤(pán)
其它名稱(chēng): 72291L20TFI
9
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72281/72291
CMOS SuperSync FIFO 65,536 x 9 and 131,072 x 9
Figure 4. Programmable Flag Offset Programming Sequence
Figure 3. Offset Register Location and Default Values
NOTES:
1. The programming method can only be selected at Master Reset.
2. Parallel reading of the offset registers is always permitted regardless of which programming method has been selected.
3. The programming sequence applies to both IDT Standard and FWFT modes.
EMPTY OFFSET (LSB) REGISTER
87
0
IDT72281 (65,536 x 9
BIT)
FULL OFFSET (LSB) REGISTER
8
7
0
FULL OFFSET (MSB) REGISTER
87
0
DEFAULT VALUE
7FH if
LD is LOW at Master Reset
FFH if
LD is HIGH at Master Reset
DEFAULT VALUE
00H if
LD is LOW at Master Reset
03H if
LD is HIGH at Master Reset
DEFAULT VALUE
7FH if
LD is LOW at Master Reset
FFH if
LD is HIGH at Master Reset
EMPTY OFFSET (MSB) REGISTER
87
0
DEFAULT VALUE
00H if
LD is LOW at Master Reset
03H if
LD is HIGH at Master Reset
EMPTY OFFSET (LSB) REGISTER
87
0
IDT72291 (131,072 x 9
BIT)
FULL OFFSET (LSB) REGISTER
87
0
FULL OFFSET (MID-BYTE) REGISTER
8
7
0
DEFAULT VALUE
7FH if
LD is LOW at Master Reset
FFH if
LD is HIGH at Master Reset
DEFAULT VALUE
7FH if
LD is LOW at Master Reset
FFH if
LD is HIGH at Master Reset
DEFAULT VALUE
00H if
LD is LOW at Master Reset
03H if
LD is HIGH at Master Reset
EMPTY OFFSET (MID-BYTE) REGISTER
87
0
DEFAULT VALUE
00H if
LD is LOW at Master Reset
03H if
LD is HIGH at Master Reset
81
0
0H
80
1
DEFAULT
0H
DEFAULT
EMPTY OFFSET
(MSB) REGISTER
FULL OFFSET
(MSB) REGISTER
4675 drw06
WCLK
RCLK
X
XX
X
XX
4675 drw07
LD
0
X
1
0
WEN
0
1
0
X
1
REN
1
0
1
X
0
1
X
SEN
1
X
0
Parallel write to registers:
Empty Offset (LSB)
Full Offset (LSB)
Full Offset (MSB)
Parallel read from registers:
Empty Offset (LSB)
Empty Offset (MSB)
Full Offset (LSB)
Full Offset (MSB)
No Operation
Write Memory
Read Memory
No Operation
Empty Offset (MSB)
Serial shift into registers:
32 bits for the IDT72281
Full Offset (LSB)
Parallel read from registers:
Empty Offset (LSB)
Empty Offset (MSB)
Full Offset (LSB)
Full Offset (MSB)
No Operation
Write Memory
Read Memory
No Operation
Serial shift into registers:
Empty Offset (Mid-Byte)
Full Offset (Mid-Byte)
Parallel write to registers:
Empty Offset (LSB)
Full Offset (MSB)
Full Offset (Mid-Byte)
Empty Offset (Mid-Byte)
Empty Offset (MSB)
34 bits for the IDT72291
1 bit for each rising WCLK edge
Starting with Empty Offset (LSB)
Ending with Full Offset (MSB)
IDT72281
IDT72291
1 bit for each rising WCLK edge
Starting with Empty Offset (LSB)
Ending with Full Offset (MSB)
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