Serial Port Signal Multiplexing; Signal Multiplexing (Mx); Figure 3-3. Serial Port Signal Multiplexing - Motorola MCP750HA Series Installation And Use Manual

Serial Port Signal Multiplexing

Due to pin limitations of the J3 connector, the MCP750HA multiplexes
and de-multiplexes some signals between the MCP750HA board and the
TMCP700 transition module. This hardware function is transparent to the
software. The block diagram for the signal multiplexing is shown in
3-3:
Serial
3
Serial
4

Figure 3-3. Serial Port Signal Multiplexing

Signal Multiplexing (MX)

There are four pins that are used for the MX 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 MCP750HA board. MXSYNC# is used by the transition
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MXDO
MXSYNC#
MXCLK
MX
Function
Connector
MXDI
Block Diagram
Figure
J3
3-19
3