Motorola MVME1X7P - Manual (Page 72)

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Programming Issues
1
15. The final byte of the area is reserved for a checksum (as defined in
the Debugging Package User’s Manual for MVME167Bug and
MVME177Bug, and the Debugging Package for Motorola 68K
CISC CPUs User’s Manual) for security and data integrity of the
configuration area of the NVRAM. This data is stored in
hexadecimal format.
Interrupt Acknowledge Map
The local bus distinguishes interrupt acknowledge cycles from other
cycles by placing the binary value %11 on TT1-TT0. It also specifies the
level that is being acknowledged using TM2-TM0. The interrupt handler
selects which device within that level is being acknowledged.
VMEbus Memory Map
This section describes the mapping of local resources as viewed by
VMEbus masters. Default addresses for the slave, master, and GCSR
address decoders are provided by the ENV command.
VMEbus Accesses to the Local Bus
The VMEchip2 includes a user-programmable map decoder for the
VMEbus-to-local-bus interface. The map decoder allows you to program
the starting and ending address and the modifiers to which the
MVME1X7P responds.
VMEbus Short I/O Memory Map
The VMEchip2 includes a user-programmable map decoder for the GCSR.
The GCSR map decoder allows you to program the starting address of the
GCSR in the VMEbus short I/O space.