IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFOTM DUAL 256 x 9, DUAL 512 x 9, D" />
參數(shù)資料
型號(hào): IDT72V811L20TF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 14/16頁
文件大小: 0K
描述: IC FIFO SYNC 512X9 20NS 64QFP
標(biāo)準(zhǔn)包裝: 80
系列: 72V
功能: 異步
存儲(chǔ)容量: 4.6K(512 x 9)
數(shù)據(jù)速率: 50MHz
訪問時(shí)間: 20ns
電源電壓: 3 V ~ 3.6 V
工作溫度: 0°C ~ 70°C
安裝類型: 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
其它名稱: 72V811L20TF
7
IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFOTM
DUAL 256 x 9, DUAL 512 x 9, DUAL 1K x 9, DUAL 2K x 9, DUAL 4K x 9, DUAL 8K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
OCTOBER 22, 2008
Figure 3. Offset Register Formats and Default Values for the A and B FIFOs
contains four 8-bit offset registers which can be loaded with data on the inputs,
or read on the outputs. See Figure 3 for details of the size of the registers and
the default values.
If FIFO A (B) is configured to have programmable flags, when the
WENA1
(
WENB1) and WENA2/LDA(WENB2/LDB) are set LOW, data on the DA (DB)
inputsarewrittenintotheEmpty(LeastSignificantBit)Offsetregisteronthefirst
LOW-to-HIGH transition of the WCLKA (WCLKB). Data are written into the
Empty (Most Significant Bit) Offset register on the second LOW-to-HIGH
transitionofWCLKA(WCLKB),intotheFull(LeastSignificantBit)Offsetregister
on the third transition, and into the Full (Most Significant Bit) Offset register on
thefourthtransition. ThefifthtransitionofWCLKA(WCLKB)againwritestothe
Empty (Least Significant Bit) Offset register.
87
0
Empty Offset (LSB) Reg.
Default Value 007H
80
Full Offset (LSB) Reg.
Default Value 007H
7
80
Empty Offset (LSB)
Default Value 007H
80
Full Offset (LSB)
Default Value 007H
72V801 - 256 x 9 x 2
72V811 - 512 x 9 x 2
7
80
(MSB)
1
0
87
0
Empty Offset (LSB) Reg.
Default Value 007H
80
Full Offset (LSB) Reg.
Default Value 007H
7
80
Empty Offset (LSB)
Default Value 007H
80
Full Offset (LSB)
Default Value 007H
72V831 - 2,048 x 9 x 2
7
80
(MSB)
0000
2
(MSB)
000
3
80
(MSB)
0000
2
(MSB)
000
3
80
8
0
80
(MSB)
1
0
87
0
Empty Offset (LSB) Reg.
Default Value 007H
80
Full Offset (LSB) Reg.
Default Value 007H
7
72V821 - 1,024 x 9 x 2
80
(MSB)
00
1
80
(MSB)
00
1
4093 drw 05
72V841 - 4,096 x 9 x 2
80
Empty Offset (LSB)
Default Value 007H
80
Full Offset (LSB)
Default Value 007H
7
80
(MSB)
00000
4
72V851 - 8,192 x 9 x 2
(MSB)
00000
80
4
However,writingalloffsetregistersdoesnothavetooccuratonetime. One
or two offset registers can be written and then by bringing
LDA(LDB) HIGH,
FIFO A (B) is returned to normal read/write operation. When
LDA(LDB) is set
LOW, and
WENA1 (WENB1) is LOW, the next offset register in sequence is
written.
ThecontentsoftheoffsetregisterscanbereadontheQA(QB)outputswhen
WENA2/
LDA (WENB2/LDB) is set LOW and both Read Enables RENA1,
RENA2(RENB1,RENB2)aresetLOW. DatacanbereadontheLOW-to-HIGH
transition of the Read Clock RCLKA (RCLKB).
A read and write should not be performed simultaneously to the offset
registers.
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