IDT72V3640/50/60/70/80/90 3.3V HIGH DENSITY SUPERSYNC IITM
參數(shù)資料
型號(hào)： IDT72V3640L6PF8
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 4/46頁
文件大?。?/td> 0K
描述： IC FIFO SS 1024X36 6NS 128-TQFP
標(biāo)準(zhǔn)包裝： 1,000
系列： 72V
功能： 異步，同步
存儲(chǔ)容量： 36.8K（1K x 36）
數(shù)據(jù)速率： 166MHz
訪問時(shí)間： 4ns
電源電壓： 3.15 V ~ 3.45 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 128-LQFP
供應(yīng)商設(shè)備封裝： 128-TQFP（14x20）
包裝： 帶卷 (TR)
其它名稱： 72V3640L6PF8
12
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
If the FIFO is full, the first read operation will cause
FF to go HIGH.
Subsequentreadoperationswillcause
PAFandHFtogoHIGHattheconditions
described in Table 3. If further read operations occur, without write operations,
PAE will go LOW when there are n words in the FIFO, where n is the empty
offsetvalue.ContinuingreadoperationswillcausetheFIFOtobecomeempty.
When the last word has been read from the FIFO, the
EFwillgoLOWinhibiting
further read operations.
REN is ignored when the FIFO is empty.
When configured in IDT Standard mode, the
EFandFFoutputsaredouble
register-bufferedoutputs.
Relevant timing diagrams for IDT Standard mode can be found in Figure
7,8,11 and 13.
FIRST WORD FALL THROUGH MODE (FWFT)
In this mode, the status flags,
IR, PAF, HF, PAE, and OR operate in the
manner outlined in Table 4. To write data into to the FIFO,
WENmustbeLOW.
DatapresentedtotheDATAINlineswillbeclockedintotheFIFOonsubsequent
transitions of WCLK. After the first write is performed, the Output Ready (
OR)
flag will go LOW. Subsequent writes will continue to fill up the FIFO.
PAEwillgo
HIGH after n + 2 words have been loaded into the FIFO, where n is the empty
offsetvalue.ThedefaultsettingforthesevaluesarestatedinthefootnoteofTable
2. This parameter is also user programmable. See section on Programmable
Flag Offset Loading.
If one continued to write data into the FIFO, and we assumed no read
operationsweretakingplace,the
HFwouldtoggletoLOWoncethe514thword
for the IDT72V3640, 1,026th word for the IDT72V3650, 2,050th word for the
IDT72V3660, 4,098th word for the IDT72V3670, 8,194th word for the
IDT72V3680,16,386thwordfortheIDT72V3690,respectivelywaswritteninto
the FIFO. Continuing to write data into the FIFO will cause the
PAFtogoLOW.
Again, if no reads are performed, the
PAF will goLOW after (1,025-m) writes
for the IDT72V3640, (2,049-m) writes for the IDT72V3650, (4,097-m) writes
for the IDT72V3660 and (8,193-m) writes for the IDT72V3670, (16,385-m)
writes for the IDT72V3680 and (32,769-m) writes for the IDT72V3690, where
m is the full offset value. The default setting for these values are stated in the
footnote of Table 2.
WhentheFIFOisfull,theInputReady(
IR)flagwillgoHIGH,inhibitingfurther
write operations. If no reads are performed after a reset,
IR willgoHIGHafter
D writes to the FIFO. D = 1,025 writes for the IDT72V3640, 2,049 writes for
the IDT72V3650, 4,097 writes for the IDT72V3660 and 8,193 writes for the
IDT72V3670,16,385 writes for the IDT72V3680 and 32,769 writes for the
IDT72V3690, respectively. Note that the additional word in FWFT mode is due
to the capacity of the memory plus output register.
If the FIFO is full, the first read operation will cause the
IR flag to go LOW.
Subsequent read operations will cause the
PAF and HF to go HIGH at the
conditions described in Table 4. If further read operations occur, without write
operations,the
PAEwillgoLOWwhentherearen+1wordsintheFIFO,where
n is the empty offset value. Continuing read operations will cause the FIFO to
become empty. When the last word has been read from the FIFO,
OR will go
HIGHinhibitingfurtherreadoperations.
RENisignoredwhentheFIFOisempty.
When configured in FWFT mode, the
OR flag output is triple register-
buffered, and the
IRflag output is double register-buffered.
Relevant timing diagrams for FWFT mode can be found in Figure 9, 10, 12,
and 14.
FUNCTIONALDESCRIPTION
TIMING MODES: IDT STANDARD vs FIRST WORD FALL THROUGH
(FWFT) MODE
The IDT72V3640/72V3650/72V3660/72V3670/72V3680/72V3690 sup-
port two different timing modes of operation: IDT Standard mode or First Word
Fall Through (FWFT) mode. The selection of which mode will operate is
determined during Master Reset, by the state of the FWFT/SI input.
If, at the time of Master Reset, FWFT/SI is LOW, then IDT Standard mode
will be selected. This mode uses the Empty Flag (
EF) to indicate whether or
not there are any words present in the FIFO. It also uses the Full Flag function
(
FF) to indicate whether or not the FIFO has any free space for writing. In IDT
Standard mode, every word read from the FIFO, including the first, must be
requested using the Read Enable (
REN) and RCLK.
If, at the time of Master Reset, FWFT/SI is HIGH, then FWFT mode will be
selected. This mode uses Output Ready (
OR)toindicatewhetherornotthere
is valid data at the data outputs (Qn). It also uses Input Ready (
IR) to indicate
whether or not the FIFO has any free space for writing. In the FWFT mode,
thefirstwordwrittentoanemptyFIFOgoesdirectlytoQnafterthreeRCLKrising
edges,
REN = LOW is not necessary. Subsequent words must be accessed
using the Read Enable (
REN) and RCLK.
Varioussignals,bothinputandoutputsignalsoperatedifferentlydepending
on which timing mode is in effect.
IDT STANDARD MODE
In this mode, the status flags,
FF, PAF, HF, PAE, and EF operate in the
manner outlined in Table 3. To write data into to the FIFO, Write Enable (
WEN)
mustbeLOW.DatapresentedtotheDATAINlineswillbeclockedintotheFIFO
on subsequent transitions of the Write Clock (WCLK). After the first write is
performed, the Empty Flag (
EF)willgoHIGH.Subsequentwriteswillcontinue
to fill up the FIFO. The Programmable Almost-Empty flag (
PAE)willgoHIGH
after n + 1 words have been loaded into the FIFO, where n is the empty offset
value. The default setting for these values are stated in the footnote of Table 2.
Thisparameterisalsouserprogrammable.SeesectiononProgrammableFlag
OffsetLoading.
If one continued to write data into the FIFO, and we assumed no read
operationsweretakingplace,theHalf-Fullflag(
HF)wouldtoggletoLOWonce
the 513rd word for IDT72V3640, 1,025th word for IDT72V3650, 2,049th word
for IDT72V3660, 4,097th word for IDT72V3670, 8,193th word for the
IDT72V3680 and 16,385th word for the IDT72V3690, respectively was written
intotheFIFO. ContinuingtowritedataintotheFIFOwillcausetheProgrammable
Almost-Full flag (
PAF) to go LOW. Again, if no reads are performed, the PAF
willgoLOWafter(1,024-m)writesfortheIDT72V3640,(2,048-m)writesforthe
IDT72V3650, (4,096-m) writes for the IDT72V3660, (8,192-m) writes for the
IDT72V3670, (16,384-m) writes for the IDT72V3680 and (32,768-m) writes
for the IDT72V3690. The offset “m” is the full offset value. The default setting
forthesevaluesarestatedinthefootnoteofTable2.Thisparameterisalsouser
programmable. See section on Programmable Flag Offset Loading.
When the FIFO is full, the Full Flag (
FF)willgoLOW,inhibitingfurtherwrite
operations. Ifnoreadsareperformedafterareset,
FFwillgoLOWafterDwrites
to the FIFO. D = 1,024 writes for the IDT72V3640, 2,048 writes for the
IDT72V3650,4,096writesfortheIDT72V3660,8,192writesfortheIDT72V3670,
16,384 writes for the IDT72V3680 and 32,768 writes for the IDT72V3690,
respectively.
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