4-14
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Functional Description
4
Local Bus Arbiter
The local bus arbiter implements a fixed priority (see
Connectors
The MVME177P has two 96-position DIN connectors: P1 and P2. P1 rows
A, B, C, and P2 row B provide the VMEbus interconnection. P2 rows A
and C provide the connection to the SCSI bus, serial ports, and Ethernet.
Pin assignments for the VME connectors on the MVME177P are listed in
Chapter 5.
Remote Status and Control
The remote status and control connector, J3, is a 20-pin connector located
behind the front panel of the MVME177P. It provides system designers
with flexibility in accessing critical indicator and reset functions. When the
board is enclosed in a chassis and the front panel is not visible, this
connector allows the Reset, Abort, and LED functions to be extended to
the control panel of the system, where they are visible. Alternatively, this
allows a system designer to construct a
RESET
/
ABORT
/LED panel that can
be located remotely from the MVME177P.
Table 4-3. Local Bus Arbitration Priority
Device
Priority
Note
LAN 0
Highest
Serial I/O
1
SCSI 2
...
VMEbus
3
Next Lowest
MC68060 MPU
4
Lowest
Содержание MVME177P
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