IDT72205LB/72215LB/72225LB/72235LB/72245LB CMOS SyncFIFOTM 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18" />
參數(shù)資料
型號(hào)： IDT72245LB25TF8
廠(chǎng)商： IDT, Integrated Device Technology Inc
文件頁(yè)數(shù)： 14/16頁(yè)
文件大小： 0K
描述： IC FIFO 1024X18 SYNC 25NS 64QFP
標(biāo)準(zhǔn)包裝： 1,250
系列： 7200
功能： 同步
存儲(chǔ)容量： 72K（4K x 18）
訪(fǎng)問(wèn)時(shí)間： 25ns
電源電壓： 4.5 V ~ 5.5 V
工作溫度： 0°C ~ 70°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： 帶卷 (TR)
其它名稱(chēng)： 72245LB25TF8
7
IDT72205LB/72215LB/72225LB/72235LB/72245LB CMOS SyncFIFOTM
256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18 and 4,096 x 18
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
MARCH 2013
When the LD pin is LOW and WEN is HIGH, the WCLK input is disabled;
thenasignalatthisinputcanneitherincrementthewriteoffsetregisterpointer,
nor execute a write.
Thecontentsoftheoffsetregisterscanbereadontheoutputlineswhenthe
LD pin is set LOW and REN is set LOW; then, data can be read on the LOW-
to-HIGH transition of the read clock (RCLK). The act of reading the control
registersemploysadedicatedreadoffsetregisterpointer.(Thereadandwrite
pointersoperateindependently).
A read and a write should not be performed simultaneously to the offset
registers.
FIRST LOAD (FL)
FLisgroundedtoindicateoperationintheSingleDeviceorWidthExpansion
mode.IntheDepthExpansionconfiguration,FLisgroundedtoindicateitisthe
first device loaded and is set to HIGH for all other devices in the Daisy Chain.
(SeeOperatingConfigurationsforfurtherdetails.)
WRITE EXPANSION INPUT (WXI)
Thisisadualpurposepin. WXIisgroundedtoindicateoperationintheSingle
Device or Width Expansion mode. WXIisconnectedtoWriteExpansionOut
(WXO) of the previous device in the Daisy Chain Depth Expansion mode.
READ EXPANSION INPUT (RXI)
Thisisadualpurposepin.RXIisgroundedtoindicateoperationintheSingle
Device or Width Expansion mode. RXI is connected to Read Expansion Out
(RXO) of the previous device in the Daisy Chain Depth Expansion mode.
OUTPUTS:
FULL FLAG(FF)
When the FIFO is full, FF will go LOW, inhibiting further write operations.
WhenFFisHIGH,theFIFOisnotfull. Ifnoreadsareperformedafterareset,
FFwillgoLOWafterDwritestotheFIFO. D=256writesfortheIDT72205LB,
512fortheIDT72215LB,1,024fortheIDT72225LB,2,048fortheIDT72235LB
and 4,096 for the IDT72245LB.
TheFFisupdatedontheLOW-to-HIGHtransitionofthewriteclock(WCLK).
EMPTY FLAG/ (EF)
WhentheFIFOisempty,EFwillgoLOW,inhibitingfurtherreadoperations.
When EF is HIGH, the FIFO is not empty.
TheEFisupdatedontheLOW-to-HIGHtransitionofthereadclock(RCLK).
PROGRAMMABLE ALMOST-FULL FLAG (PAF)
The Programmable Almost-Full Flag (PAF) will go LOW when FIFO
reachestheAlmost-Fullcondition. IfnoreadsareperformedafterReset(RS),
thePAFwillgoLOWafter(256-m)writesfortheIDT72205LB,(512-m)writes
fortheIDT72215LB,(1,024-m)writesfortheIDT72225LB,(2,048–m)writes
fortheIDT72235LBand(4,096–m)writesfortheIDT72245LB. Theoffset“m”
isdefinedintheFULLoffsetregister.
IfthereisnoFulloffsetspecified,the PAFwillbeLOWwhenthedeviceis
31awayfromcompletelyfullforIDT72205LB,63awayfromcompletelyfullfor
IDT72215LB, and 127 away from completely full for IDT72225LB/72235LB/
72245LB.
ThePAFisassertedLOWontheLOW-to-HIGHtransitionofthewriteclock
(WCLK).PAFisresettoHIGHontheLOW-to-HIGHtransitionofthereadclock
(RCLK). Thus PAF is asynchronous.
PROGRAMMABLEALMOST-EMPTYFLAG(PAE)
TheProgrammableAlmost-EmptyFlag(PAE)willgoLOWwhentheread
pointeris"n+1"locationslessthanthewritepointer.Theoffset"n"isdefinedin
theEMPTYoffsetregister.
IfthereisnoEmptyoffsetspecified,theProgrammableAlmost-EmptyFlag
(PAE) will be LOW when the device is 31 away from completely empty for
IDT72205LB,63awayfromcompletelyemptyforIDT72215LB,and127away
fromcompletelyemptyforIDT72225LB/72235LB/72245LB.
ThePAEisassertedLOWontheLOW-to-HIGHtransitionofthereadclock
(RCLK).PAEisresettoHIGHontheLOW-to-HIGHtransitionofthewriteclock
(WCLK). Thus PAE is asynchronous.
WRITE EXPANSION OUT/HALF-FULL FLAG (WXO/HF)
This is a dual-purpose output. In the Single Device and Width Expansion
mode, when Write Expansion In (WXI) and Read Expansion In (RXI) are
grounded,thisoutputactsasanindicationofahalf-fullmemory.
Number of Words in FIFO
IDT72205LB
IDT72215LB
IDT72225LB
IDT72235LB
IDT72245LB
FF PAF
HF PAE EF
00
0
H
L
1 to n(1)
HH
H
L
H
(n + 1) to 128
(n + 1) to 256
(n + 1) to 512
(n + 1) to 1,024
(n + 1) to 2,048
H
129 to (256-(m+1))
257 to (512-(m+1))
513 to (1,024-(m+1))
1,025 to (2,048-(m+1))
2,049 to (4,096-(m+1))
HH
L
H
(256-m)(2)to255
(512-m)(2)to511
(1,024-m)(2)to1,023
(2,048-m)(2)to2,047
(4,096-m)(2)to4,095
H
L
H
256
512
1,024
2,048
4,096
L
H
TABLE 1 — STATUS FLAGS
NOTES:
1. n = Empty Offset (Default Values : IDT72205LB n=31, IDT72215LB n = 63, IDT72225LB/72235LB/72245LB n = 127)
2. m = Full Offset (Default Values : IDT72205LB m=31, IDT72215LB m = 63, IDT72225LB/72235LB/72245LB m = 127)
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