Semaphore Register 2; Vme Geographical Address Register (Vgar); Z85230 Escc And Z8536 Cio Registers And Port Pins - Motorola MVME2600 Series Reference Manual

Board Description and Memory Maps
1

Semaphore Register 2

REG
BIT SD7
FIELD
OPER
RESET 0

VME Geographical Address Register (VGAR)

REG
BIT SD7
FIELD
OPER
RESET X

Z85230 ESCC and Z8536 CIO Registers and Port Pins

1-44
The Semaphore Register 2 is an 8-bit register located at ISA I/O address
x1005. The Universe 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.
Semaphore Register 2 - Offset $1005
SD6 SD5
0 0
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.
VME Geographical Address Register - Offset $1006
SD6 SD5
GAP#
X X
The Z85230 ESCC is used to provide the two sync/async serial ports on
some MVME2600/2700 series models. The PCLK which can be used to
derived the baud rates, is 10 MHz. Refer to the SCC User's Manual for
programming information on the Z85230 ESCC device.
SD4 SD3 SD2
SEM2
R/W
0 0
SD4 SD3 SD2
GA4# GA3# GA2#
READ ONLY
X X
SD1 SD0
0 0 0
SD1 SD0
GA1# GA0#
X X X