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参数资料
| 型号： | IDT723676L15PF |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 4/39页 |
| 文件大小： | 0K |
| 描述： | IC FIFO SYNC 16384X36 128QFP |
| 标准包装： | 36 |
| 系列： | 7200 |
| 功能： | 同步 |
| 存储容量： | 576K（16K x 36） |
| 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： | 128-LQFP |
| 供应商设备封装： | 128-TQFP（14x20） |
| 包装： | 托盘 |
| 其它名称： | 723676L15PF |
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12
IDT723656/723666/723676 CMOS TRIPLE BUS SyncFIFOTM WITH
BUS MATCHING 2,048 x 36 x 2, 4,096 x 36 x 2 and 8,192 x 36 x 2
COMMERCIALTEMPERATURERANGE
FS2
FS1/
SEN
FS0/SD
MRS1
MRS2
X1 AND Y1 REGlSTERS(1)
X2 AND Y2 REGlSTERS(2)
HH
H
↑
X64
X
HH
H
X
↑
X64
HH
L
↑
X16
X
HH
L
X
↑
X16
HL
H
↑
X8
X
HL
H
X
↑
X8
LH
H
↑
X
256
X
LH
H
X
↑
X
256
LL
H
↑
X
1,024
X
LL
H
X
↑
X
1,024
LH
L
↑↑
Serial programming via SD
HL
L
↑↑
Parallel programming via Port A(3,5)
LL
L
↑↑
IP Mode(4, 5)
Once the Master Reset (
MRS1, MRS2) input is HIGH, a LOW on the BE/
FWFTinputduringthenextLOW-to-HIGHtransitionofCLKA(forFIFO1)and
CLKC (for FIFO2) will select FWFT mode. This mode uses the Output Ready
function (ORA, ORB) to indicate whether or not there is valid data at the data
outputs (A0-A35 or B0-B17). It also uses the Input Ready function (IRA, IRC)
to indicate whether or not the FIFO memory has any free space for writing. In
theFWFTmode,thefirstwordwrittentoanemptyFIFOgoesdirectlytothedata
outputs, no read request necessary. Subsequent words must be accessed by
performing a formal read operation.
Following Master Reset, the level applied to the BE/
FWFT inputtochoose
the desired timing mode must remain static throughout FIFO operation. Refer
to Figure 4 (FIFO1 Master Reset) and Figure 5 (FIFO2 Master Reset) for First
Word Fall Through select timing diagrams.
PROGRAMMING THE ALMOST-EMPTY AND ALMOST-FULL FLAGS
FourregistersintheseFIFOsareusedtoholdtheoffsetvaluesfortheAlmost-
EmptyandAlmost-Fullflags. ThePortBAlmost-Emptyflag(
AEB)Offsetregister
is labeled X1 and the Port A Almost-Empty flag (
AEA)Offsetregisterislabeled
X2. The Port A Almost-Full flag (
AFA)OffsetregisterislabeledY1andthePort
CAlmost-Fullflag(
AFC)OffsetregisterislabeledY2. Theindexofeachregister
namecorrespondstoitsFIFOnumber. TheOffsetregisterscanbeloadedwith
preset values during the reset of a FIFO, programmed in parallel using the
FIFO’s Port A data inputs, or programmed in serial using the Serial Data (SD)
input (see Table 1).
FS0/SD, FS1/
SEN and FS2 function the same way in both IDT Standard
and FWFT modes.
— PRESET VALUES
ToloadaFIFO’sAlmost-EmptyflagandAlmost-FullflagOffsetregisterswith
oneofthefivepresetvalueslistedinTable1,theflagselectinputsmustbeHIGH
or LOW during a master reset. For example, to load the preset value of 64 into
X1andY1,FS0,FS1andFS2mustbeHIGHwhenFlFO1reset(
MRS1)returns
HIGH. Flag Offset registers associated with FIFO2 are loaded with one of the
preset values in the same way with FIFO2 Master Reset (
MRS2) toggled
simultaneously with FIFO1 Master Reset (
MRS1). ForrelevantPresetvalue
loading timing diagrams, see Figure 4 and 5.
— PARALLEL LOAD FROM PORT A
To program the X1, X2, Y1, and Y2 registers from Port A, perform a Master
Reset on both FlFOs simultaneously with FS2 HIGH or LOW, FS0 and FS1
LOWduringtheLOW-to-HIGHtransitionof
MRS1andMRS2. ThestateofFS2
atthispointofresetwilldeterminewhethertheparallelprogrammingmethodhas
Interspersed Parity or Non-Interspersed Parity. Refer to Table 1 for Flag
Programming Flag Offset setup . It is important to note that once parallel
programming has been selected during a Master Reset by holding both FS0
& FS1 LOW, these inputs must remain LOW during all subsequent FIFO
operation. They can only be toggled HIGH when future Master Resets are
performed and other programming methods are desired.
After this reset is complete, the first four writes to FIFO1 do not store data in
RAM but load the Offset registers in the order Y1, X1, Y2, X2. For Non-
InterspersedParitymodethePortAdatainputsusedbytheOffsetregistersare
(A10-A0), (A11-A0), or (A12-A0) for the IDT723656, IDT723666, or
IDT723676, respectively. For Interspersed Parity mode the Port A data inputs
used by the Offset registers are (A11-A9, A7-A0), (A12-A9, A7-A0), or (A13-
A9, A7-A0) for the IDT723656, IDT723666, or IDT723676, respectively. The
highest numbered input is used as the most significant bit of the binary number
ineachcase. Validprogrammingvaluesfortheregistersrangefrom1to2,044
for the IDT723656; 1 to 4,092 for the IDT723666; and 1 to 8,188 for the
IDT723676. AfteralltheOffsetregistersareprogrammedfromPortA,thePort
C Full/Input Ready flag (
FFC/IRC)issetHIGH,andbothFIFOsbeginnormal
operation. Refer to Figure 8 for a timing diagram illustration for parallel
programming of the flag offset values.
INTERSPERSED PARITY
Interspersed Parity is selected during a Master Reset of the FIFO. Refer to
Table 1 for the set-up configuration of Interspersed Parity. The Interspersed
Parity function allows the user to select the location of the parity bits in the word
loadedintotheparallelport(A0-An)duringprogrammingoftheflagoffsetvalues.
TABLE 1 —
—
— FLAG PROGRAMMING
NOTES:
1. X1 register holds the offset for
AEB; Y1 register holds the offset for AFA.
2. X2 register holds the offset for
AEA; Y2 register holds the offset for AFC.
3. When this method of parallel programming is selected, Port A will assume Non-Interspersed Parity.
4. When IP Mode is selected, only parallel programming of the offset values via Port A, can be performed and Port A will assume Interspersed Parity.
5. IF parallel programming is selected during a Master Reset, then FS0 & FS1 must remain LOW during FIFO operation.
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