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IDT72V255LA Datasheet(PDF) 11 Page - Integrated Device Technology

Part # IDT72V255LA
Description  3.3 VOLT CMOS SuperSync FIFO
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT72V255LA Datasheet(HTML) 11 Page - Integrated Device Technology

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IDT72V255LA/72V265LA 3.3 VOLT CMOS SuperSync FIFO™
8,192 x 18, 16,384 x 18
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
If FWFT mode is selected, the FIFO will mark the beginning of the
Retransmit setup by setting OR HIGH. During this period, the internal read
pointer is set to the first location of the RAM array.
When OR goes LOW, Retransmit 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, Retransmit Timing (FWFT
Mode), for the relevant timing 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 synchronized to
WCLK, thus the second rising edge of WCLK that occurs tSKEW after the
rising edge of RCLK that RT is setup will update PAF. RT is synchronized to
RCLK.


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