Motorola MVME172 - Manual (Page 112)

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VMEchip2
2
A32 When this bit is high, the second map decoder responds to
VMEbus A32 (extended) access cycles. When this bit is
low, the second map decoder does not respond to
VMEbus A32 access cycles.
USR When this bit is high, the second map decoder responds to
VMEbus user (non-privileged) access cycles. When this
bit is low, the second map decoder does not responded to
VMEbus user access cycles.
SUP When this bit is high, the second map decoder responds to
VMEbus supervisory access cycles. When this bit is low,
the second map decoder does not respond to VMEbus
supervisory access cycles.