IDT72261 IDT [Integrated Device Technology], IDT72261 Datasheet - Page 28

• Manufacturer Part Number: IDT72261
• Description: CMOS SUPERSYNC FIFOO 16,384 x 9, 32,768 x 9
• Manufacturer: IDT [Integrated Device Technology]

IDT72261/72271 SyncFIFO
16,384 x 9, 32,768 x 9
WIDTH EXPANSION CONFIGURATION
gether the control signals of multiple devices. Status flags can
be detected from any one device. The exceptions are the
and
functions in FWFT mode. Because of variations in skew
between RCLK and WCLK, it is possible for
and
OPERATING CONFIGURATIONS
SINGLE DEVICE CONFIGURATION
Word width may be increased simply by connecting to-
A single IDT72261/722171 may be used when the applica-
IR
FF
/
OR
functions in IDT Standard mode and the
assertion to vary by one cycle between FIFOs. In
FIRST WORD FALL THROUGH/SERIAL INPUT
PROGRAMMABLE ALMOST FULL (
FULL FLAG/INPUT READY (
Figure 21. Block Diagram of Single 16,384x9/32,768x9 Synchronous FIFO
WRITE CLOCK (WCLK)
WRITE ENABLE (
SERIAL ENABLE(
DATA IN (D
PARTIAL RESET (
EF
/
FF
LOAD (
(FWFT/SI)
deassertion
IR
0
FF
WEN
SEN
PAF
and
- D
LD
/
FREQUENCY SELECT (FS)
IR
8
)
)
)
)
)
)
OR
EF
PRS
72261/
72271
tion requirements are for 16,384/32,768 words or less. The
IDT72261/72271 can always be used in Single Device Con-
figuration, whether IDT Standard Mode or FWFT Mode has
been selected. No special set up procedure is necessary.
)
IDT Standard mode, such problems can be avoided by creat-
ing composite flags, that is, ANDing
separately ANDing
posite flags can be created by ORing
separately ORing
an 18-word width by using two IDT72261/72271s. Any word
width can be attained by adding additional IDT7226172271s.
IDT
MASTER RESET (
RETRANSMIT (
READ CLOCK (RCLK)
READ ENABLE (
DATA OUT (Q
EMPTY FLAG/OUTPUT READY (
PROGRAMMABLE ALMOST EMPTY (
HALF FULL FLAG (
OUTPUT ENABLE (
MILITARY AND COMMERCIAL TEMPERATURE RANGES
IR
FF
MRS
of every FIFO. Figure 22 demonstrates
of every FIFO. In FWFT mode, com-
0
)
RT
- Q
REN
)
8
HF
)
OE
)
)
)
EF
OR
of every FIFO, and
EF
of every FIFO, and
3036 drw 24
/
OR
PAE
)
)
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