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SN74V245 Scheda tecnica(PDF) 4 Page - Texas Instruments

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Il numero della parte SN74V245
Spiegazioni elettronici  DSP-SYNC FIRST-IN, FIRST-OUT MEMORY
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SN74V245-EP
SCAS932A – DECEMBER 2012 – REVISED JANUARY 2013
www.ti.com
TERMINAL FUNCTIONS (continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
28, 29, 31, 32, 34,
36–39, 41, 42, 44,
Q0–Q17
O
Data outputs. Data outputs for an 18-bit bus.
45, 47, 48, 50, 52,
53
Read clock. When REN is low, data is read from the FIFO on a low-to-high transition of
RCLK
61
I
RCLK, if the FIFO is not empty.
Read enable. When REN is low, data is read from the FIFO on every low-to-high transition of
REN
60
I
RCLK. When REN is high, the output register holds the previous data. Data is not read from
the FIFO if EF is low.
Reset. When RS is set low, internal read and write pointers are set to the first location of the
RS
57
I
RAM array, FF and PAF go high, and PAE and EF go low. A reset is required before an
initial write after power up.
Read expansion. In the single-device or width-expansion configuration, RXI, together with FL
and WXI, determines if the mode is standard mode or FWFT mode, as well as whether the
RXI
24
I
PAE/PAF flags are synchronous or asynchronous (see Table 5). In the daisy-chain depth-
expansion configuration, RXI is connected to RXO (read expansion out) of the previous
device.
Last-location-read flag. In the depth-expansion configuration, a pulse is sent from RXO to
RXO
27
O
RXI of the next device when the last location in the FIFO is read.
VCC
22, 33, 43, 49, 56
Supply voltage. +3.3-V power-supply pins.
Write clock. When WEN is low, data is written into the FIFO on a low-to-high transition of
WCLK
19
I
WCLK if the FIFO is not full.
Write enable. When WEN is low, data is written into the FIFO on every low-to-high transition
WEN
20
I
of WCLK. When WEN is high, the FIFO holds the previous data. Data is not written into the
FIFO if FF is low.
Width expansion. In the single-device or width-expansion configuration, WXI, together with
FL and RXI, determines if the mode is standard mode or FWFT mode, as well as whether
WXI
21
I
the PAE/PAF flags are synchronous or asynchronous (see Table 5). In the daisy-chain
depth-expansion configuration, WXI is connected to WXO (write expansion out) of the
previous device.
Half-full flag. In the single-device or width-expansion configuration, the device is more than
WXO/HF
26
O
half full when HF is low. In the depth-expansion configuration, a pulse is sent from WXO to
WXI of the next device when the last location in the FIFO is written.
4
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