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DESCRIPTION AND OPERATION
MODULE DESCRIPTION
2 - 2
WBPEEUI240759A0
®
the operation of the module without having to physically
replace discrete components.
•
Four megabytes DRAM for microprocessor use. The mem-
ory is a 72-pin SIMM DRAM module mounted on the circuit
board.
Ethernet Interface (P8)
The Ethernet interface consists of onboard isolation transform-
ers, a transceiver, and a DC/DC converter which allows for
direct 10Base2 thinwire connection. The EDI module connects
to Ethernet LAN through the BNC connector (P8) located on the
front panel.
Ethernet (P3)
The EDI module has a built-in Ethernet coprocessor. The mod-
ule can connect to 10Base5 thickwire network by connecting
an IKEDI01 cable from the P3 connector to an external MAU
with a 15-pin, D-type connector.
X-Bus Interface
The I/O expander bus interface circuitry consists mainly of a
custom integrated circuit found on all INFI 90 OPEN I/O mod-
ules. All the control logic and communication protocol are built
into the integrated circuit. This circuit provides the following
functions:
•
Address comparison and detection.
•
Function code latching and decoding.
•
Read strobe generation.
•
Data line filtering of bus signals.
•
On-board bus drivers.
It manages the requests for data coming from the MFP module
and the data exchange between the EDI module and MFP mod-
Figure 2-1. Block Diagram
T01290A
LED
DRIVERS
X-BUS
INTERFACE
I/O EXPANDER
BUS (P2)
CONTROL
LOGIC
DATA BUS
SWITCHES
(S1 TO S6)
ETHERNET
INTERFACE
ETHERNET
BNC (P8)
MODULE
POWER
+5 VDC,
+15 VDC (P1)
RS-232-C PORT (P5)
ETHERNET (P3)
MEMORY
CPU
MFT
STOP/
RESET