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IDT73720APQF Datasheet

  • IDT73720APQF

  • 16-BIT TRI-PORT BUS EXCHANGER

  • 78.86KB

  • 8頁

  • IDT

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16-BIT TRI-PORT
BUS EXCHANGER
Integrated Device Technology, Inc.
IDT73720/A
FEATURES:
鈥?High-speed 16-bit bus exchange for interbus communica-
tion in the following environments:
鈥?Multi-way interleaving memory
鈥?Multiplexed address and data busses
鈥?Direct interface to R3051 family RISChipSet鈩?/div>
鈥?R3051鈩?family of integrated RISController鈩?CPUs
鈥?R3721 DRAM controller
鈥?Data path for read and write operations
鈥?Low noise 12mA TTL level outputs
鈥?Bidirectional 3-bus architecture: X, Y, Z
鈥?One CPU bus: X
鈥?Two (interleaved or banked) memory busses:Y & Z
鈥?Each bus can be independently latched
鈥?Byte control on all three busses
鈥?Source terminated outputs for low noise and undershoot
control
鈥?68-pin PLCC and 80-pin PQFP package
鈥?High-performance CMOS technology.
DESCRIPTION:
The IDT73720/A Bus Exchanger is a high speed 16-bit bus
exchange device intended for inter-bus communication in
interleaved memory systems and high performance multi-
plexed address and data busses.
The Bus Exchanger is responsible for interfacing between
the CPU A/D bus (CPU address/data bus) and multiple
memory data busses.
The 73720/A uses a three bus architecture (X, Y, Z), with
control signals suitable for simple transfer between the CPU
bus (X) and either memory bus (Y or Z). The Bus Exchanger
features independent read and write latches for each memory
bus, thus supporting a variety of memory strategies. All three
ports support byte enable to independently enable upper and
lower bytes.
FUNCTIONAL BLOCK DIAGRAM
OEYL
8
LEXY
Y-WRITE
LATCH
16
8
8
LEYX
8
8
OEXL
X
0:7
X
8:15
OEXU
8
8
M
U
16 X
OEXU
OEXL
OEYU
OEYL
OEZU
OEZL
16
Z-READ
LATCH
16
8
Z-WRITE
LATCH
16
8
OEZU
NOTE:
1. Logic equations for bus control:
OEXU = T/
R
* .
OEU
*; OEXL = T/
R
* .
OEL
*; OEYU = T/
R
. PATH .
OEU
*
OEYL = T/
R
. PATH .
OEL
*; OEZU = T/
R
. PATH* .
OEU
*; OEZL = T/
R
. PATH* .
Figure 1. 73720 Block Diagram
Y
0:7
Y
8:15
8
(Even Path)
16
Y-READ
LATCH
OEYU
16
PATH
BUS CONTROL
T/R
OEU
OEL
8
8
LEZX
OEZL
8
8
Z
0:7
Z
8:15
(Odd Path)
2527 drw 01
16
LEXZ
OEL
*
RISChipSet, RISController, R305x, R3051, R3052 are trademarks and the IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
漏1995
Integrated Device Technology, Inc.
AUGUST 1995
11.5
DSC-2046/6
1

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