參數(shù)資料
型號(hào)： IDT72281L
廠商： Integrated Device Technology, Inc.
英文描述： CMOS SuperSync FIFO
中文描述： 先進(jìn)先出的CMOS SuperSync
文件頁(yè)數(shù)： 11/26頁(yè)
文件大?。?/td> 277K
代理商： IDT72281L
11
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72281/72291
CMOS SuperSync FIFO 65,536 x 9 and 131,072 x 9
RETRANSMIT OPERATION
The Retransmt operation allows data that has already been read to be
accessed again. There are two stages: first, a setup procedure that resets
the read pointer to the first location of memory, then the actual retransmt,
which consists of reading out the memory contents, starting at the begin-
ning of memory.
Retransmt setup is initiated by holding
RT
LOW during a rising RCLK
edge.
REN
and
WEN
must be HIGH before bringing
RT
LOW. At least
one word, but no more than D– 2 words should have been written into
the FIFO between Reset (Master or Partial) and the time of Retransmt
setup. D = 65,536 for the IDT72281 and D = 131,072 for the IDT72291
in IDT Standard mode. In FWFT mode, D = 65,537 for the IDT72281
and D = 131,073 for the IDT72291.
If IDT Standard mode is selected, the FIFO will mark the beginning of
the Retransmt setup by setting
EF
LOW. The change in level will only be
noticeable if
EF
was HIGH before setup. During this period, the internal
read pointer is initialized to the first location of the RAMarray.
When
EF
goes HIGH, Retransmt setup is complete and read opera-
tions may begin starting with the first location in memory. Since IDT Stan-
dard mode is selected, every word read including the first word following
Retransmt setup requires a LOW on
REN
to enable the rising edge of
RCLK. See Figure 11,
Retransmt Timng (IDT Standard Mode)
, for the
relevant timng diagram
If FWFT mode is selected, the FIFO will mark the beginning of the
Retransmt setup by setting
OR
HIGH. During this period, the internal read
pointer is set to the first location of the RAMarray.
When
OR
goes LOW, Retransmt setup is complete; at the same time,
the contents of the first location appear on the outputs. Since FWFT mode
is selected, the first word appears on the outputs, no LOW on
REN
is
necessary. Reading all subsequent words requires a LOW on
REN
to
enable the rising edge of RCLK. See Figure 12,
Retransmt Timng (FWFT
Mode)
, for the relevant timng diagram
For either IDT Standard mode or FWFT mode, updating of the
PAE
,
HF
and
PAF
flags begin with the rising edge of RCLK that
RT
is setup.
PAE
is synchronized to RCLK, thus on the second rising edge of RCLK
after
RT
is setup, the
PAE
flag will be updated.
HF
is asynchronous, thus
the rising edge of RCLK that
RT
is setup will update
HF
.
PAF
is synchro-
nized to WCLK, thus the second rising edge of WCLK that occurs t
SKEW
after the rising edge of RCLK that
RT
is setup will update
PAF
.
RT
is
synchronized to RCLK.
相關(guān)PDF資料
PDF描述
IDT72281L10PF CMOS SuperSync FIFO
IDT72281L10PFI CMOS SuperSync FIFO
IDT72281L10TF CMOS SuperSync FIFO
IDT723612L15PF BiCMOS SyncBiFIFOO 64 x 36 x 2
IDT723612L15PQF BiCMOS SyncBiFIFOO 64 x 36 x 2
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IDT72281L10PF 功能描述:IC FIFO 32768X18 LP 10NS 64QFP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標(biāo)準(zhǔn)包裝:15 系列:74F 功能:異步 存儲(chǔ)容量:256（64 x 4） 數(shù)據(jù)速率:- 訪問(wèn)時(shí)間:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:24-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:24-PDIP 包裝:管件 其它名稱:74F433
IDT72281L10PF8 功能描述:IC FIFO 32768X18 LP 10NS 64QFP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標(biāo)準(zhǔn)包裝:15 系列:74F 功能:異步 存儲(chǔ)容量:256（64 x 4） 數(shù)據(jù)速率:- 訪問(wèn)時(shí)間:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:24-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:24-PDIP 包裝:管件 其它名稱:74F433
IDT72281L10PFG 制造商:Integrated Device Technology Inc 功能描述:IC FIFO 32768X18 LP 10NS 64QFP
IDT72281L10PFG8 制造商:Integrated Device Technology Inc 功能描述:IC FIFO 32768X18 LP 10NS 64QFP
IDT72281L10TF 功能描述:IC FIFO 32768X18 LP 10NS 64QFP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標(biāo)準(zhǔn)包裝:15 系列:74F 功能:異步 存儲(chǔ)容量:256（64 x 4） 數(shù)據(jù)速率:- 訪問(wèn)時(shí)間:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:24-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:24-PDIP 包裝:管件 其它名稱:74F433
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