Motorola MVME2400 Series Service Manual Page 56

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Board Description and Memory Maps
1
Semaphore Register 2
The Semaphore Register 2 is an 8-bit register located at ISA I/O address
x1005. The Universe II ASIC is programmed so that this register can be
accessible from the VMEbus. This register can only be updated if bit 7 is
low or if the new value has the most significant bit cleared. When bit 7 is
high, this register will not latch in the new value if the new value has the
most significant bit set.
VME Geographical Address Register (VGAR)
The VME Geographical Address Register is an 8-bit read-only register
located at ISA I/O address x1006. This register reflects the states of the
geographical address pins at the 5-row, 160-pin P1 connector.
REG Semaphore Register 2 - Offset $1005
BIT SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0
FIELD SEM2
OPER R/W
RESET 00000000
REG VME Geographical Address Register - Offset $1006
BIT SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0
FIELD GAP# GA4# GA3# GA2# GA1# GA0#
OPER READ ONLY
RESET XXXXXXXX
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