参数资料
型号: IDT72285L10PFG
厂商: IDT, Integrated Device Technology Inc
文件页数: 16/25页
文件大小: 0K
描述: IC FIFO 65536X18 10NS 64TQFP
标准包装: 90
系列: 7200
功能: 同步
存储容量: 1.1M(65K x 18)
访问时间: 10ns
电源电压: 4.5 V ~ 5.5 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(14x14)
包装: 托盘
23
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72275/72285
CMOS SuperSync FIFO 32,768 x 18 and 65,536 x 18
NOTES:
1. Use an AND gate in IDT Standard mode, an OR gate in FWFT mode.
2. Do not connect any output control signals directly together.
3. FIFO #1 and FIFO #2 must be the same depth, but may be different word widths.
OPTIONAL CONFIGURATIONS
WIDTH EXPANSION CONFIGURATION
Word width may be increased simply by connecting together 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
Figure 19. Block Diagram of 32,768 x 36 and 65,536 x 36 Width Expansion
problems can be avoided by creating composite flags, that is, ANDing EF of
every FIFO, and separately ANDing FF of every FIFO. In FWFT mode,
composite flags can be created by ORing OR of every FIFO, and separately
ORing IR of every FIFO.
Figure19,BlockDiagramof32,768x36and65,536x36WidthExpansion
demonstratesawidthexpansionusingtwoIDT72275/72285devices. D0-D17
from each device form a 36-bit wide input bus and Q0-Q17 from each device
form a 36-bit wide output bus. Any word width can be attained by adding
additionalIDT72275/72285devices.
WRITE CLOCK (WCLK)
m + n
m
n
MASTER RESET (
MRS)
READ CLOCK (RCLK)
DATA OUT
n
m + n
WRITE ENABLE (
WEN)
FULL FLAG/INPUT READY (
FF/IR)
PROGRAMMABLE (
PAF)
PROGRAMMABLE (
PAE)
EMPTY FLAG/OUTPUT READY (
EF/OR) #2
OUTPUT ENABLE (
OE)
READ ENABLE (
REN)
m
LOAD (
LD)
IDT
72275
72285
EMPTY FLAG/OUTPUT READY (
EF/OR) #1
PARTIAL RESET (
PRS)
IDT
72275
72285
4674 drw 22
FULL FLAG/INPUT READY (
FF/IR) #2
HALF-FULL FLAG (
HF)
FIRST WORD FALL THROUGH/
SERIAL INPUT (FWFT/SI)
RETRANSMIT (
RT)
#1
FIFO
#2
GATE
(1)
GATE
(1)
D0 - Dm
DATA IN
Dm+1 - Dn
Q0 - Qm
Qm+1 - Qn
FIFO
#1
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