参数资料
型号: IDT72V225L15TFI8
厂商: IDT, Integrated Device Technology Inc
文件页数: 23/25页
文件大小: 0K
描述: IC FIFO SYNC 1024X18 15NS 64QFP
标准包装: 1,250
系列: 72V
功能: 同步
存储容量: 18.4K(1K x 18)
访问时间: 15ns
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(10x10)
包装: 带卷 (TR)
其它名称: 72V225L15TFI8
7
IDT72V205/72V215/72V225/72V235/72V245 3.3V 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
ThecontentsoftheoffsetregisterscanbereadonthedataoutputlinesQ0-
Q11 when the LD pin is set LOW and REN is set LOW. Data can then be read
onthenextLOW-to-HIGHtransitionofRCLK. ThefirsttransitionofRCLKwill
presenttheemptyoffsetvaluetothedataoutputlines.ThenexttransitionofRCLK
willpresentthefulloffsetvalue.OffsetregistercontentcanbereadoutintheIDT
Standard mode only. It cannot be read in the FWFT mode.
SYNCHRONOUS vs ASYNCHRONOUS PROGRAMMABLE FLAG TIM-
ING SELECTION
The IDT72V205/72V215/72V225/72V235/72V245 can be configured
during the "Configuration at Reset" cycle described in Table 3 with either
asynchronous or synchronous timing for PAE and PAF flags.
If asynchronous PAE/PAF configuration is selected (as per Table 3), the
PAEisassertedLOWontheLOW-to-HIGHtransitionofRCLK.PAEisresetto
HIGHontheLOW-to-HIGHtransitionofWCLK.Similarly,thePAFisasserted
LOWontheLOW-to-HIGHtransitionofWCLKandPAFisresettoHIGHonthe
LOW-to-HIGHtransitionofRCLK.Fordetailtimingdiagrams,seeFigure13for
asynchronous PAE timing and Figure 14 for asynchronous PAF timing.
IfsynchronousPAE/PAFconfigurationisselected,thePAEisassertedand
updated on the rising edge of RCLK only and not WCLK. Similarly, PAF is
assertedandupdatedontherisingedgeofWCLKonlyandnotRCLK.Fordetail
timingdiagrams,seeFigure22forsynchronousPAEtimingandFigure23for
synchronousPAFtiming.
REGISTER-BUFFERED FLAG OUTPUT SELECTION
The IDT72V205/72V215/72V225/72V235/72V245 can be configured
duringthe"ConfigurationatReset"cycledescribedinTable4withsingle,double
ortripleregister-bufferedflagoutputsignals.Thevariouscombinationsavail-
able are described in Table 4 and Table 5. In general, going from single to
doubleortriplebufferedflagoutputsremovesthepossibilityofmetastableflag
indicationsonboundarystates(i.e,emptyorfullconditions).Thetrade-offisthe
addition of clock cycle delays for the respective flag to be asserted. Not all
combinationsof register-bufferedflagoutputsaresupported.Register-buffered
outputsapplytotheEmptyFlagandFullFlagonly. Partialflagsarenoteffected.
Table 4 and Table 5 summarize the options available.
Number of Words in FIFO
IDT72V205
IDT72V215
IDT72V225
IDT72V235
IDT72V245
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))(2)
257 to (512-(m+1))(2)
513 to (1,024-(m+1))(2)
1,025 to (2,048-(m+1))(2)
2,049 to (4,096-(m+1))(2)
HH
L
H
(256-m)to255
(512-m)to511
(1,024-m)to1,023
(2,048-m)to2,047
(4,096-m)to4,095
H
L
H
256
512
1,024
2,048
4,096
L
H
TABLE 1 — STATUS FLAGS FOR IDT STANDARD MODE
TABLE 2 — STATUS FLAGS FOR FWFT MODE
Number of Words in FIFO
IDT72V205
IDT72V215
IDT72V225
IDT72V235
IDT72V245
IR PAF HF PAE OR
00
0
L
H
L
H
1 to (n + 1)(1)
LH
H
L
(n + 2) to 129
(n + 2) to 257
(n + 2) to 513
(n + 2) to 1,025
(n + 2) to 2,049
L
H
L
130 to (257-(m+1))(2)
258 to (513-(m+1))(2)
514 to (1,025-(m+1))(2)
1,026 to (2,049-(m+1))(2)
2,050 to (4,097-(m+1))(2)
LH
L
(257-m) to 256
(513-m) to 512
(1,025-m) to 1,024
(2,049-m) to 2,048
(4,097-m) to 4,096
LL
L
H
L
257
513
1,025
2,049
4,097
H
L
H
L
NOTES:
1. n = Empty Offset (Default Values : IDT72V205 n = 31, IDT72V215 n = 63, IDT72V225/72V235/72V245 n = 127)
2. m = Full Offset (Default Values : IDT72V205 m = 31, IDT72V215 m = 63, IDT72V225/72V235/72V245 m = 127)
NOTES:
1. n = Empty Offset (Default Values : IDT72V205 n = 31, IDT72V215 n = 63, IDT72V225/72V235/72V245 n = 127)
2. m = Full Offset (Default Values : IDT72V205 m = 31, IDT72V215 m = 63, IDT72V225/72V235/72V245 m = 127)
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