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参数资料
| 型号： | IDT72V3680L10PF8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 9/46页 |
| 文件大小： | 0K |
| 描述： | IC FIFO SS 16384X36 10NS 128TQFP |
| 标准包装： | 1,000 |
| 系列： | 72V |
| 功能： | 异步，同步 |
| 存储容量： | 576K（16K x 36） |
| 数据速率： | 100MHz |
| 访问时间： | 10ns |
| 电源电压： | 3.15 V ~ 3.45 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-LQFP |
| 供应商设备封装： | 128-TQFP（14x20） |
| 包装： | 带卷 (TR) |
| 其它名称： | 72V3680L10PF8 |
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17
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72V3640/50/60/70/80/90 3.3V HIGH DENSITY SUPERSYNC IITM 36-BIT FIFO
1,024 x 36, 2,048 x 36, 4,096 x 36, 8,192 x 36, 16,384 x 36 and 32,768 x 36
OCTOBER 22, 2008
SERIAL PROGRAMMING MODE
If Serial Programming mode has been selected, as described above, then
programmingof
PAEandPAFvaluescanbeachievedbyusingacombination
ofthe
LD,SEN,WCLKandSIinputpins.ProgrammingPAEandPAFproceeds
as follows: when
LD and SEN are set LOW, data on the SI input are written,
onebitforeachWCLKrisingedge,startingwiththeEmptyOffsetLSBandending
with the Full Offset MSB. A total of 20 bits for the IDT72V3640, 22 bits for the
IDT72V3650, 24 bits for the IDT72V3660, 26 bits for the IDT72V3670, 28 bits
for the IDT72V3680 and 30 bits for the IDT72V3690. See Figure 15, Serial
LoadingofProgrammableFlagRegisters,forthetimingdiagramforthismode.
Using the serial method, individual registers cannot be programmed
selectively.
PAEandPAFcanshowavalidstatusonlyafterthecompleteset
of bits (for all offset registers) has been entered. The registers can be
reprogrammed as long as the complete set of new offset bits is entered. When
LD is LOW and SEN is HIGH, no serial write to the registers can occur.
Write operations to the FIFO are allowed before and during the serial
programming sequence. In this case, the programming of all offset bits does
not have to occur at once. A select number of bits can be written to the SI input
and then, by bringing
LDandSENHIGH,datacanbewrittentoFIFOmemory
via Dn by toggling
WEN. When WEN is brought HIGH with LD and SEN
restored to a LOW, the next offset bit in sequence is written to the registers via
SI. Ifaninterruptionofserialprogrammingisdesired,itissufficienteithertoset
LDLOWanddeactivateSENortosetSENLOWanddeactivateLD. OnceLD
and
SENarebothrestoredtoaLOWlevel,serialoffsetprogrammingcontinues.
From the time serial programming has begun, neither programmable flag
will be valid until the full set of bits required to fill all the offset registers has been
written. MeasuringfromtherisingWCLKedgethatachievestheabovecriteria;
PAFwillbevalidaftertwomorerisingWCLKedgesplustPAF,PAEwillbevalid
after the next two rising RCLK edges plus tPAE plus tSKEW2.
ItisonlypossibletoreadtheflagoffsetvaluesviatheparalleloutputportQn.
PARALLEL MODE
IfParallelProgrammingmodehasbeenselected,asdescribedabove,then
programmingof
PAEandPAFvaluescanbeachievedbyusingacombination
of the
LD, WCLK , WEN and Dn input pins. Programming PAE and PAF
proceedsasfollows:
LDandWENmustbesetLOW.Forx36bitinputbuswidth,
dataontheinputsDnarewrittenintotheEmptyOffsetRegisteronthefirstLOW-
to-HIGH transition of WCLK. Upon the second LOW-to-HIGH transition of
WCLK,dataarewrittenintotheFullOffsetRegister.ThethirdtransitionofWCLK
writes, once again, to the Empty Offset Register. For x18 bit input bus width,
dataontheinputsDnarewrittenintotheEmptyOffsetRegisterLSBonthefirst
LOW-to-HIGH transition of WCLK. Upon the 2nd LOW-to-HIGH transition of
WCLKdataarewrittenintotheEmptyOffsetRegisterMSB.Thethirdtransition
ofWCLKwritestotheFullOffsetRegisterLSB,thefourthtransitionofWCLKthen
writes to the Full Offset Register MSB. The fifth transition of WCLK writes once
againtotheEmptyOffsetRegisterLSB. Atotaloffourwritestotheoffsetregisters
is required to load values using a x18 input bus width. For an input bus width
ofx9bits,atotalofsixwritecyclestotheoffsetregistersisrequiredtoloadvalues.
See Figure 3, Programmable Flag Offset Programming Sequence. See
Figure 16, Parallel Loading of Programmable Flag Registers, for the timing
diagram for this mode.
Theactofwritingoffsetsinparallelemploysadedicatedwriteoffsetregister
pointer. The act of reading offsets employs a dedicated read offset register
pointer. The two pointers operate independently; however, a read and a write
shouldnotbeperformedsimultaneouslytotheoffsetregisters. AMasterReset
initializes both pointers to the Empty Offset (LSB) register. A Partial Reset has
no effect on the position of these pointers.
Write operations to the FIFO are allowed before and during the parallel
programmingsequence.Inthiscase,theprogrammingofalloffsetregistersdoes
not have to occur at one time. One, two or more offset registers can be written
and then by bringing
LDHIGH,writeoperationscanberedirectedtotheFIFO
memory. When
LDissetLOWagain,andWENisLOW,thenextoffsetregister
in sequence is written to. As an alternative to holding
WENLOWandtoggling
LD, parallel programming can also be interrupted by setting LD LOW and
toggling
WEN.
Note that the status of a programmable flag (
PAEor PAF)outputisinvalid
during the programming process. From the time parallel programming has
begun, a programmable flag output will not be valid until the appropriate offset
word has been written to the register(s) pertaining to that flag. Measuring from
the rising WCLK edge that achieves the above criteria;
PAF will be valid after
twomorerisingWCLKedgesplustPAF,
PAEwillbevalidafterthenexttworising
RCLK edges plus tPAE plus tSKEW2.
The act of reading the offset registers employs a dedicated read offset
register pointer. The contents of the offset registers can be read on the Q0-Qn
pins when
LDissetLOWandRENissetLOW.Forx36outputbuswidth,data
are read via Qn from the Empty Offset Register on the first LOW-to-HIGH
transitionofRCLK.UponthesecondLOW-to-HIGHtransitionofRCLK,dataare
readfromtheFullOffsetRegister.ThethirdtransitionofRCLKreads,onceagain,
from the Empty Offset Register. For x18 output bus width, a total of four read
cycles are required to obtain the values of the offset registers. Starting with the
EmptyOffsetRegisterLSBandfinishingwiththeFullOffsetRegisterMSB.For
x9 output bus width, a total of six read cycles must be performed on the offset
registers. See Figure 3, Programmable Flag Offset Programming Sequence.
See Figure 17, Parallel Read of Programmable Flag Registers, for the timing
diagram for this mode.
It is permissible to interrupt the offset register read sequence with reads or
writes to the FIFO. The interruption is accomplished by deasserting
REN,LD,
or both together. When
REN and LD are restored to a LOW level, reading of
theoffsetregisterscontinueswhereitleftoff.Itshouldbenoted,andcareshould
be taken from the fact that when a parallel read of the flag offsets is performed,
the data word that was present on the output lines Qn will be overwritten.
Parallel reading of the offset registers is always permitted regardless of
which timing mode (IDT Standard or FWFT modes) has been selected.
RETRANSMIT OPERATION
The Retransmit operation allows data that has already been read to be
accessed again. There are 2 modes of Retransmit operation, normal latency
and zero latency. There are two stages to Retransmit: first, a setup procedure
that resets the read pointer to the first location of memory, then the actual
retransmit, which consists of reading out the memory contents, starting at the
beginning of memory.
Retransmitsetupisinitiatedbyholding
RTLOWduringarisingRCLKedge.
REN and WEN must be HIGH before bringing RT LOW. When zero latency
is utilized,
REN does not need to be HIGH before bringing RT LOW. At least
twowords,butnomorethanD-2wordsshouldhavebeenwrittenintotheFIFO,
and read from the FIFO, between Reset (Master or Partial) and the time of
Retransmit setup. D = 1,024 for the IDT72V3640, 2,048 for the IDT72V3650,
4,096 for the IDT72V3660, 8,192 for the IDT72V3670, 16,384 for the
IDT72V3680 and 32,768 for the IDT72V3690. In FWFT mode, D = 1,025 for
the IDT72V2640, 2,049 for the IDT72V3650, 4,097 for the IDT72V3660, 8,193
fortheIDT72V3670,16,385fortheIDT72V3680and32,769fortheIDT72V3690.
If IDT Standard mode is selected, the FIFO will mark the beginning of the
Retransmitsetupbysetting
EFLOW. Thechangeinlevelwillonlybenoticeable
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT72V3680L10PFI | 制造商:Integrated Device Technology Inc 功能描述: |
| IDT72V3680L15PF | 功能描述:IC FIFO SS 16384X36 15NS 128TQFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:15 系列:74F 功能:异步 存储容量:256（64 x 4） 数据速率:- 访问时间:- 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:24-DIP（0.300"，7.62mm） 供应商设备封装:24-PDIP 包装:管件 其它名称:74F433 |
| IDT72V3680L15PF8 | 功能描述:IC FIFO SS 16384X36 15NS 128TQFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:15 系列:74F 功能:异步 存储容量:256（64 x 4） 数据速率:- 访问时间:- 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:24-DIP（0.300"，7.62mm） 供应商设备封装:24-PDIP 包装:管件 其它名称:74F433 |
| IDT72V3680L15PFI | 功能描述:IC FIFO SS 16384X36 15NS 128TQFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:15 系列:74F 功能:异步 存储容量:256（64 x 4） 数据速率:- 访问时间:- 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:24-DIP（0.300"，7.62mm） 供应商设备封装:24-PDIP 包装:管件 其它名称:74F433 |
| IDT72V3680L15PFI8 | 功能描述:IC FIFO SS 16384X36 15NS 128TQFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:15 系列:74F 功能:异步 存储容量:256（64 x 4） 数据速率:- 访问时间:- 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:24-DIP（0.300"，7.62mm） 供应商设备封装:24-PDIP 包装:管件 其它名称:74F433 |
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