參數(shù)資料
型號: IDT72T7295L10BB
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 7/53頁
文件大?。?/td> 0K
描述: IC FIFO 32768X72 10NS 324-BGA
標準包裝: 1
系列: 72T
訪問時間: 10ns
電源電壓: 2.375 V ~ 2.625 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 324-BGA
供應商設備封裝: 324-PBGA(19x19)
包裝: 托盤
其它名稱: 72T7295L10BB
15
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72T7285/72T7295/72T72105/72T72115 2.5V TeraSync
72-BIT FIFO
16,384 x 72, 32,768 x 72, 65,536 x 72, 131,072 x 72
PROGRAMMING FLAG OFFSETS
FullandEmptyFlagoffsetvaluesareuserprogrammable.TheIDT72T7285/
72T7295/72T72105/72T72115haveinternalregistersfortheseoffsets.There
are eight default offset values selectable during Master Reset. These offset
values are shown in Table 2. Offset values can also be programmed into the
FIFO in one of two ways; serial or parallel loading method. The selection of the
loadingmethodisdoneusingthe
LD(Load)pin.DuringMasterReset,thestate
of the
LDinputdetermineswhetherserialorparallelflagoffsetprogrammingis
enabled. A HIGH on
LD during Master Reset selects serial loading of offset
values. A LOW on
LD during Master Reset selects parallel loading of offset
values.
In addition to loading offset values into the FIFO, it is also possible to read
the current offset values. Offset values can be read via the parallel output port
Q0-Qn, regardless of the programming mode selected (serial or parallel). It is
not possible to read the offset values in serial fashion.
Figure3,ProgrammableFlagOffsetProgrammingSequence,summaries
thecontrolpinsandsequenceforbothserialandparallelprogrammingmodes.
For a more detailed description, see discussion that follows.
The offset registers may be programmed (and reprogrammed) any time
after Master Reset, regardless of whether serial or parallel programming has
been selected. Valid programming ranges are from 0 to D-1.
SYNCHRONOUS vs ASYNCHRONOUS PROGRAMMABLE FLAG
TIMING SELECTION
TheIDT72T7285/72T7295/72T72105/72T72115canbeconfiguredduring
theMasterResetcyclewitheithersynchronousorasynchronoustimingfor
PAF
and
PAE flags by use of the PFM pin.
If synchronous
PAF/PAE configuration is selected (PFM, HIGH during
MRS),thePAFisassertedandupdatedontherisingedgeofWCLKonlyand
not RCLK. Similarly,
PAEisassertedandupdatedontherisingedgeofRCLK
onlyandnotWCLK.Fordetailtimingdiagrams,seeFigure23forsynchronous
PAF timing and Figure 24 for synchronous PAE timing.
If asynchronous
PAF/PAE configuration is selected (PFM, LOW during
MRS),thePAFisassertedLOWontheLOW-to-HIGHtransitionofWCLKand
PAFisresettoHIGHontheLOW-to-HIGHtransitionofRCLK. Similarly,PAE
isassertedLOWontheLOW-to-HIGHtransitionofRCLK.
PAEisresettoHIGH
on the LOW-to-HIGH transition of WCLK. For detail timing diagrams, see
Figure 25 for asynchronous
PAFtimingandFigure26forasynchronousPAE
timing.
IDT72T7285,72T7295,72T72105,72T72115
*
LD
FSEL1
FSEL0
Offsets n,m
H
L
1,023
LH
L
511
L
H
255
L
127
LH
H
63
HH
L
31
HL
H
15
HH
H
7
*
LD
FSEL1
FSEL0
Program Mode
H
X
Serial(3)
L
X
Parallel(4)
*THIS PIN MUST BE HIGH AFTER MASTER RESET TO WRITE
OR READ DATA TO/FROM THE FIFO MEMORY.
TABLE 2 — DEFAULT PROGRAMMABLE
FLAG OFFSETS
NOTES:
1. n = empty offset for
PAE.
2. m = full offset for
PAF.
3. As well as selecting serial programming mode, one of the default values will also
be loaded depending on the state of FSEL0 & FSEL1.
4. As well as selecting parallel programming mode, one of the default values will
also be loaded depending on the state of FSEL0 & FSEL1.
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