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AD0-AD7
nINT1
RESET
nRD
nWR
A15
AD0-AD2, D3-D7
nCS
nRESET IN
nRD/nDS
nWR/DIR
nINTR
A2/BALE
ALE
A0/nMUX
XTAL1
XTAL2
X
T
A
L
1
X
T
A
L
2
GND
RXIN
nPULSE1
nPULSE2
nTXEN
27 pF
27 pF
8051
FIGURE 2 - MULTIPLEXED, 8051-LIKE BUS INTERFACE WITH RS-485 INTERFACE
RXIN
nPULSE1
nPULSE2
TXEN
GND
+5V
100 Ohm
BACKPLANE CONFIGURATION
FIGURE A
COM20020
Differential Driver
Configuration
Media Interface
may be replaced
with Figure A, B or C.
RXIN
nPULSE1
FIGURE B
Receiver
HFD3212-002
2
+5V
7
6
Transmitter
HFE4211-014
+5V
3
2 Fiber Interface
*
(ST Connectors)
2
6
7
NOTE: COM20020 must be in backplane mode
75176B or
Equiv.