I/O Signal Multiplexing (Iomx); Figure 6-2. Serial Port Signal Multiplexing - Motorola MCPN750A Installation And Use Manual

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Serial
1
2
Serial
2
2
Serial
3
2
Serial
4

Figure 6-2. Serial Port Signal Multiplexing

I/O Signal Multiplexing (IOMX)

There are four pins that are used for the IOMX function: MXCLK,
MXSYNC#, MXDO, and MXDI. MXCLK is the 10 MHz bit clock for the
time-multiplexed data lines MXDO and MXDI. MXSYNC# is asserted for
one bit time at Time Slot 15 by the MCPN750A board. MXSYNC# is used
by the transition module to synchronize with the MCPN750A board.
MXDO is the time-multiplexed output line from the main board and
MXDI is the time-multiplexed line from the transition module. A 16-to-1
multiplexing scheme is used with 10 MHz bit rate. Sixteen Time Slots are
defined and allocated as follows:
http://www.motorola.com/computer/literature
4
4
4
4
MXDO
MXSYNC#
MXCLK
IOMX
Connector
Function
MXDI
Block Diagram
J3
6
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