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Functional Description
3
Z8536 CIO Device
The Z8536 CIO device complements the Z85230 ESCC by supplying
modem control lines not provided by the Z85230 ESCC. In addition, the
Z8536 CIO device has three independent 16-bit counters/ timers. The
Z85230 receives a 5 MHz clock input.
Base Module Feature Register
The Base Module Feature Register contains the details of the
MVME2603/2604 single board computer’s configuration. It is an 8-bit
read-only register located on the base board at ISA I/O address $0802.
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.
PMC2P
∗
PMC/PMCIX slot 2 present. If set, no PCI mezzanine card (or
PCI expansion device) is installed in PMC slot 2. If cleared,
PMC/PMCIX slot 2 contains a PCI mezzanine card (or PCI
expansion device).
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.
VMEP
∗
VMEbus present. If set, there is no VMEbus interface. If
cleared, the VMEbus interface is supported.
LANP
∗
Ethernet present. If set, no Ethernet transceiver interface is
installed. If cleared, there is on-board Ethernet support.
Base Module Feature Register — Offset $0802
BIT
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
FIELD
Not Used SCCP
∗
PMC2P
∗
PMC1P
∗
VMEP
∗
Not Used
LANP
∗
SCSIP
∗
OPER
R
R
R
R
R
R
RESET
N/A
1
N/A
N/A
N/A
N/A