參數(shù)資料
型號: IDT72T3645L4-4BB
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 9/57頁
文件大?。?/td> 0K
描述: IC FIFO 1024X36 4-4NS 208-BGA
標準包裝: 1
系列: 72T
功能: 異步,同步
存儲容量: 36.8K(1K x 36)
數(shù)據(jù)速率: 100MHz
訪問時間: 3.4ns
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: 208-BGA
供應(yīng)商設(shè)備封裝: 208-PBGA(17x17)
包裝: 托盤
其它名稱: 72T3645L4-4BB
17
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72T3645/55/65/75/85/95/105/115/125 2.5V TeraSync
36-BIT FIFO
1K x 36, 2K x 36, 4K x 36, 8K x 36, 16K x 36, 32K x 36, 64K x 36, 128K x 36 and 256K x 36
FEBRUARY 4, 2009
PROGRAMMING FLAG OFFSETS
FullandEmptyFlagoffsetvaluesareuserprogrammable.TheIDT72T3645/
72T3655/72T3665/72T3675/72T3685/72T3695/72T36105/72T36115/
72T36125haveinternalregistersfortheseoffsets.Thereareeightdefaultoffset
valuesselectableduringMasterReset.TheseoffsetvaluesareshowninTable
2.OffsetvaluescanalsobeprogrammedintotheFIFOinoneoftwoways;serial
or parallel loading method. The selection of the loading method is done using
the
LD (Load) pin. During Master Reset, the state of the LD input determines
whether serial or parallel flag offset programming is enabled. A HIGH on
LD
duringMasterResetselectsserialloadingofoffsetvalues.ALOWon
LDduring
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
The IDT72T3645/72T3655/72T3665/72T3675/72T3685/72T3695/
72T36105/72T36115/72T36125 can be configured during the Master Reset
cycle with either synchronous or asynchronous timing for
PAFand PAEflags
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.
IDT72T3645, 72T3655
*
LD
FSEL1
FSEL0
Offsets n,m
LH
L
511
L
H
255
L
127
LH
H
63
HL
L
31
HH
L
15
HL
H
7
HH
H
3
*
LD
FSEL1
FSEL0
Program Mode
H
X
Serial(3)
L
X
Parallel(4)
IDT72T3665,72T3675,72T3685,72T3695, 72T36105,
72T36115, 72T36125
*
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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