Block Diagram
http://www.motorola.com/computer/literature
3-19
3
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
:
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
Serial
J3
MX
Serial
MXDO
MXSYNC#
MXCLK
MXDI
Connector
3
4
Function