參數(shù)資料
型號: IDT72265L25PFB
廠商: Integrated Device Technology, Inc.
英文描述: Bi-Directional Triode Thyristor Planar Silicon
中文描述: 的CMOS SUPERSYNC FIFOO 8192 × 18,16,384 × 18
文件頁數(shù): 28/30頁
文件大?。?/td> 394K
代理商: IDT72265L25PFB
28
MILITARY AND COMMERCIAL TEMPERATURE RANGES
IDT72255/72265 SyncFIFO
8,192 x 18, 16,384 x 18
OPERATING CONFIGURATIONS
SINGLE DEVICE CONFIGURATION
A single IDT72255/72265 may be used when the applica-
tion requirements are for 8,192/16,384 words or less. The
IDT72255/72265 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.
Figure 21. Block Diagram of Single 8,192x18/16,384x18 Synchronous FIFO
WIDTH EXPANSION CONFIGURATION
Word width may be increased simply by connecting to-
gether the control signals of multiple devices. Status flags can
be detected from any one device. The exceptions are the
EF
and
FF
functions in IDT Standard mode and the
IR
and
OR
functions in FWFT mode. Because of variations in skew
between RCLK and WCLK, it is possible for
EF
/
FF
deassertion
and
IR
/
OR
assertion to vary by one cycle between FIFOs. In
IDT Standard mode, such problems can be avoided by creat-
ing composite flags, that is, ANDing
EF
of every FIFO, and
separately ANDing
FF
of every FIFO. In FWFT mode, com-
posite flags can be created by ORing
OR
of every FIFO, and
separately ORing
IR
of every FIFO. Figure 22 demonstrates
an 36-word width by using two IDT72255/72265s. Any word
width can be attained by adding additional IDT72255/72265s.
DATA OUT (Q
0
- Q
17
)
DATA IN (D
0
- D
17
)
MASTER RESET (
MRS
)
READ CLOCK (RCLK)
READ ENABLE (
REN
)
OUTPUT ENABLE (
OE
)
EMPTY FLAG/OUTPUT READY (
EF
/
OR
)
PROGRAMMABLE ALMOST EMPTY (
PAE
)
WRITE CLOCK (WCLK)
WRITE ENABLE (
WEN
)
LOAD (
LD
)
FULL FLAG/INPUT READY (
FF
/
IR
)
PROGRAMMABLE ALMOST FULL (
PAF
)
IDT
72255/
72265
PARTIAL RESET (
PRS
)
FIRST WORD FALL THROUGH/SERIAL INPUT
(FWFT/SI)
RETRANSMIT (
RT
)
3037 drw 24
HALF FULL FLAG (
HF
)
FREQUENCY SELECT (FS)
SERIAL ENABLE(
SEN
)
相關(guān)PDF資料
PDF描述
IDT72265L25TF Bi-Directional Triode Thyristor Planar Silicon; Package: TO-220F; No of Pins: 3; Container: Rail
IDT72265L25TFB High Conductance Low Leakage Diode; Package: SOT-23; No of Pins: 3; Container: Tape & Reel
IDT72265L12TFB CMOS SUPERSYNC FIFOO 8,192 x 18, 16,384 x 18
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