IDT74FCT162952BTPV 반도체 회로 부품 판매점
16-BIT TRI-PORT BUS EXCHANGER
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 Integrated Device Technology |
16-BIT TRI-PORT
BUS EXCHANGER
IDT73720/A
Integrated Device Technology, Inc.
FEATURES:
• High-speed 16-bit bus exchange for interbus communica-
tion in the following environments:
— Multi-way interleaving memory
— Multiplexed address and data busses
• Direct interface to R3051 family RISChipSet™
— R3051™ family of integrated RISController™ CPUs
— R3721 DRAM controller
• Data path for read and write operations
• Low noise 12mA TTL level outputs
• Bidirectional 3-bus architecture: X, Y, Z
— One CPU bus: X
— Two (interleaved or banked) memory busses:Y & Z
— Each bus can be independently latched
• Byte control on all three busses
• Source terminated outputs for low noise and undershoot
control
• 68-pin PLCC and 80-pin PQFP package
• High-performance CMOS technology.
FUNCTIONAL BLOCK DIAGRAM
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.
LEXY
LEYX
88
OEXL
OEYL
8
Y-WRITE
LATCH
16
8
Y-READ
LATCH
16
8
OEYU
16
8
Y0:7
Y8:15
(Even Path)
X0:7
X8:15
8
M
U
16 X
8
OEXU
OEXL
OEYU
OEYL
OEZU
OEZL
BUS CONTROL
PATH
T/R
OEU
OEL
LEZX
LEXZ
OEXU
88
16
16
Z-READ
LATCH
16 OEZL
8
8
Z-WRITE
LATCH
16
8
OEZU
NOTE:
Figure 1. 73720 Block Diagram
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* . OEL*
8
Z0:7
Z8:15
(Odd Path)
2527 drw 01
RISChipSet, RISController, R305x, R3051, R3052 are trademarks and the IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
AUGUST 1995
©1995 Integrated Device Technology, Inc.
11.5
DSC-2046/6
1
IDT73720/A 16-BIT TRI-PORT BUS EXCHANGER
PIN CONFIGURATIONS
COMMERCIAL TEMPERATURE RANGE
GND
X8
X9
X10
X11
X12
X13
X14
X15
GND
VCC
PATH
OEU
LEYX
LEZX
Y0
Y1
9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
10 60
11 Pin 1 59
12 Designator 58
13 57
14 56
15 55
16 54
17 53
18 J68-1 52
19 51
20 50
21 49
22 48
23 47
24 46
25 45
26 44
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
Z9
Z8
Z7
Z6
Z5
Z4
Z3
Z2
Z1
Z0
GND
VCC
LEXZ
OEL
LEXY
T/R
GND
PLCC
TOP VIEW
2527 drw 02
GND
NC
NC
X8
X9
X10
X11
X12
X13
X14
X15
GND
VCC
PATH
OEU
LEYX
LEZX
Y0
Y1
GND
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
1 60
2 Pin 1
3 Designator
4
59
58
57
5 56
6 55
7 54
8 53
9 52
10
PQ80-1
11
51
50
12 49
13 48
14 47
15 46
16 45
17 44
18 43
19 42
20
21
22
23 24
25
26 27 28
29
30
31
32
33 34
35
36
37
38
39
4041
GND
Z9
Z8
Z7
Z6
Z5
Z4
Z3
Z2
Z1
Z0
GND
VCC
LEXZ
OEL
LEXY
T/R
NC
NC
GND
PQFP
TOP VIEW
11.5
2527 drw 03
2
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