Base Module Feature Register; Serial Port Signal Multiplexing - Motorola MCP750 Installation And Use Manual

Functional Description

Base Module Feature Register

3
BIT
FIELD Not Used SCCP
OPER
RESET

Serial Port Signal Multiplexing

3-14
The Base Module Feature Register contains the details of the MCP750
single-board computer's configuration. It is an 8-bit read-only register
located on the base board at ISA I/O address $0802.
Base Module Feature Register — Offset $0802
SD7 SD6 SD5
Not Used PMC1P
R R R
1 N/A 1
SCCP Z85230 ESCC present. If set, there is no on-board synchronous
serial support (the ESCC is not present). If cleared, the Z85230 ESCC is
installed and there is on-board support for synchronous serial
communication.
PMC1P PMC slot 1 present. If set, no PCI mezzanine card is installed in
PMC slot 1. If cleared, PMC slot 1 contains a PCI mezzanine card.
LANP Ethernet present. If set, no Ethernet transceiver interface is
installed. If cleared, there is on-board Ethernet support.
Due to pin limitations of the J3 connector, the MCP750 multiplexes and
de-multiplexes some signals between the MCP750 board and the
TMCP700 transition module. This hardware function is transparent to the
software. The block diagram for the signal multiplexing is shown in the
Figure 3-2:
SD4 SD3 SD2
Not Used Not Used
R R R
N/A 1 1
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SD1 SD0
LANP Not Used
R R
N/A 1