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SN74V3650-6PEU Datasheet(PDF) 5 Page - Texas Instruments

No. de pieza SN74V3650-6PEU
Descripción Electrónicos  102436, 204836, 409636, 819236, 1638436, 32768 횞 36 3.3-V CMOS FIRST-IN, FIRST-OUT MEMORIES
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

SN74V3650-6PEU Datasheet(HTML) 5 Page - Texas Instruments

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SN74V3640, SN74V3650, SN74V3660, SN74V3670, SN74V3680, SN74V3690
1024
× 36, 2048 × 36, 4096 × 36, 8192 × 36, 16384 × 36, 32768 × 36
3.3-V CMOS FIRST-IN, FIRST-OUT MEMORIES
SCAS668A – NOVEMBER 2001 – REVISED MARCH 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
If the asynchronous PAE/PAF configuration is selected, PAE is asserted low on the low-to-high transition of
RCLK. PAE is reset to high on the low-to-high transition of WCLK. Similarly, PAF is asserted low on the
low-to-high transition of WCLK, and PAF is reset to high on the low-to-high transition of RCLK.
If the synchronous PAE/PAF configuration is selected , the PAE is asserted and updated on the rising edge of
RCLK only, and not WCLK. Similarly, PAF is asserted and updated on the rising edge of WCLK only, and not
RCLK. The mode desired is configured during master reset by the state of the programmable flag mode (PFM).
The retransmit function allows data to be reread from the FIFO more than once. A low on the retransmit (RT)
input during a rising RCLK edge initiates a retransmit operation by setting the read pointer to the first location
of the memory array. Zero-latency retransmit timing mode can be selected using the retransmit timing mode
(RM). During master reset, a low on RM selects zero-latency retransmit. A high on RM during master reset
selects normal latency.
If zero-latency retransmit operation is selected, the first data word to be retransmitted is placed on the output
register, with respect to the same RCLK edge that initiated the retransmit, if RT is low.
See Figures 11 and 12 for normal latency retransmit timing. See Figures 13 and 14 for zero-latency retransmit
timing.
The devices can be configured with different input and output bus widths (see Table 1).
Table 1. Bus-Matching Configuration Modes
BM
IW
OW
WRITE-PORT
WIDTH
READ-PORT
WIDTH
L
L
L
×36
×36
H
L
L
×36
×18
H
L
H
×36
×9
H
H
L
×18
×36
H
H
H
×9
×36
† Logic levels during master reset
A big-endian/little-endian data word format is provided. This function is useful when data is written into the FIFO
in long-word (
×36/×18) format and read out of the FIFO in small-word (×18/×9) format. If big-endian mode is
selected, the most-significant byte (MSB) (word) of the long word written into the FIFO is read out of the FIFO
first, followed by the least-significant byte (LSB). If little-endian format is selected, the LSB of the long word
written into the FIFO is read out first, followed by the MSB. The mode desired is configured during master reset
by the state of the big-endian/little-endian (BE) pin (see Figure 4 for the bus-matching byte arrangement).
The interspersed/noninterspersed parity (IP) bit function allows the user to select the parity bit in the word loaded
into the parallel port (D0–Dn) when programming the flag offsets. If interspersed-parity mode is selected, the
FIFO assumes that the parity bit is located in bit positions D8, D17, D26, and D35 during the parallel
programming of the flag offsets. If noninterspersed-parity mode is selected, D8, D17, and D26 are assumed
to be valid bits, and D32, D33, D34, and D35 are ignored. Interspersed parity mode is selected during master
reset by the state of the IP input. Interspersed parity control has an effect only during parallel programming of
the offset registers. It does not affect data written to and read from the FIFO.
The SN74V3640, SN74V3650, SN74V3660, SN74V3670, SN74V3680, and SN74V3690 are fabricated using
high-speed submicron CMOS technology, and are characterized for operation from 0
°C to 70°C.


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