参数资料
型号: IDT72421L15J
厂商: IDT, Integrated Device Technology Inc
文件页数: 5/14页
文件大小: 0K
描述: IC FIFO 64X9 SYNC 15NS 32-PLCC
标准包装: 32
系列: 7200
功能: 同步
存储容量: 576(64 x 9)
数据速率: 67MHz
访问时间: 15ns
电源电压: 4.5 V ~ 5.5 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 32-LCC(J 形引线)
供应商设备封装: 32-PLCC(13.97x11.43)
包装: 管件
其它名称: 72421L15J
13
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72421/72201/72211/72221/72231/72241/72251 CMOS SyncFIFO
64 x 9, 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9
configuration,theWriteEnable2/Load(WEN2/LD)pinissetLOWatResetso
thatthepinoperatesasacontroltoloadandreadtheprogrammableflagoffsets.
DEPTH EXPANSION - The IDT72421/72201/72211/72221/72231/72241/
72251 can be adapted to applications when the requirements are for greater
than 64/256/512/1,024/2,048/4,096/8,192 words. The existence of two
enable pins on the read and write port allow depth expansion. The Write
Enable 2/Load pin is used as a second write enable in a depth expansion
configurationthustheProgrammableflagsaresettothedefaultvalues. Depth
expansion is possible by using one enable input for system control while the
otherenableinputiscontrolledbyexpansionlogictodirecttheflowofdata. A
typicalapplicationwouldhavetheexpansionlogicalternatedataaccessfrom
one device to the next in a sequential manner. These devices operate in the
DepthExpansionconfigurationwhenthefollowingconditionsaremet:
1. The WEN2/ LD pin is held HIGH during Reset so that this pin operates a
secondWriteEnable.
2. External logic is used to control the flow of data.
Please see the Application Note "DEPTH EXPANSION OF IDT'S SYN-
CHRONOUSFIFOsUSINGTHERINGCOUNTERAPPROACH"fordetails
ofthisconfiguration.
Figure 15. Block Diagram of 64 x 18, 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18, 4,096 x 18, 8,192 x 18
Synchronous FIFO Used in a Width Expansion Configuration
OPERATINGCONFIGURATIONS
SINGLE DEVICE CONFIGURATION
AsingleIDT72421/72201/72211/72221/72231/72241/72251maybeused
when the application requirements are for 64/256/512/1,024/2,048/4,096/
8,192wordsorless.WhentheseFIFOsareinaSingleDeviceConfiguration,
the Read Enable 2 (REN2) control input can be grounded (see Figure 14). In
thisconfiguration,theWriteEnable2/Load(WEN2/LD)pinissetLOWatReset
so that the pin operates as a control to load and read the programmable flag
offsets.
WIDTH EXPANSION CONFIGURATION
Wordwidthmaybeincreasedsimplybyconnectingthecorrespondinginput
controlssignalsofmultipledevices. Acompositeflagshouldbecreatedforeach
oftheendpointstatusflags(EFandFF). Thepartialstatusflags(AEandAF)
can be detected from any one device. Figure 15 demonstrates a 18-bit word
width by using two IDT72421/72201/72211/72221/72231/72241/72251s.
AnywordwidthcanbeattainedbyaddingadditionalIDT72421/72201/72211/
72221/72231/72241/72251s.
When these FIFOs are in a Width Expansion Configuration, the Read
Enable 2 (REN2) control input can be grounded (see Figure 15). In this
Figure 14. Block Diagram of Single 64 x 9, 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9, 8,192 x 9 Synchronous FIFO
DATA OUT (Q0 - Q8)
DATA IN (D0 - D8)
RESET (
RS)
READ CLOCK (RCLK)
READ ENABLE 1 (
REN1)
OUTPUT ENABLE (
OE)
EMPTY FLAG (
EF)
PROGRAMMABLE ALMOST-EMPTY (
PAE)
READ ENABLE 2 (
REN2)
WRITE CLOCK (WCLK)
WRITE ENABLE 1 (
WEN1)
WRITE ENABLE 2/LOAD (WEN2/
LD)
FULL FLAG (
FF)
PROGRAMMABLE ALMOST-FULL (
PAF)
IDT
72421
72201
72211
72221
72231
72241
72251
2655 drw 16
DATA IN (D)
WRITE CLOCK (WCLK)
18
9
RESET (
RS)
READ CLOCK (RCLK)
DATA OUT (Q)
9
18
READ ENABLE 2 (
REN2)
READ ENABLE 2 (
REN2)
WRITE ENABLE1 (
WEN1)
FULL FLAG (
FF) #1
PROGRAMMABLE (
PAF)
PROGRAMMABLE (
PAE)
EMPTY FLAG (
EF) #2
OUTPUT ENABLE (
OE)
READ ENABLE1 (
REN1)
9
WRITE ENABLE2/LOAD (WEN2/
LD)
IDT
72421
72201
72211
72221
72231
72241
72251
FULL FLAG (
FF) #2
EMPTY FLAG (
EF) #1
RESET (
RS)
IDT
72421
72201
72211
72221
72231
72241
72251
2655 drw 17
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