Universe Configuration Registers
6-11
6.2.5 Miscellaneous Control Register
The Universe Miscellaneous Control Register, MISC_CTL, at hex offset 404
16
defines VMEbus arbitration characteristics, software reset options, and other mis-
cellaneous parameters.
VRM
VMEbus request mode.
Binary 0=demand, 1=fair.
VREL
VMEbus release mode.
Binary 0=release when done, 1=release upon request.
VOWN
VME ownership bit. (VMEbus masters should not set this bit.)
Binary 0=release VMEbus, 1=acquire and hold VMEbus.
VOWN_ACK
VME ownership bit acknowledge (synchronized to PCI clock).
Binary 0=not owned, 1=acquired and held due to VOWN. (Read only.)
PABS
PCI aligned burst size. This determines the PCI address boundary where
the Universe breaks up a PCI transaction.
Binary 00=32 bytes, 01=64 bytes, 10=128 bytes, all others=reserved.
BUS_NO
PCI bus number. If the bus number of the PCI address equals this value,
the configuration cycle is Type 0. Otherwise, it is Type 1.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
VBTO
Rsv.
VARB
VARBTO
SW_
LRST
SW_
SRST
Rsv.
BI
ENGBI
RE-
SCIND
SYS-
CON
V64-
AUTO
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
Register Map 6-4. Universe Miscellaneous Control, MISC_CTL
VBTO
VMEbus timeout in microseconds. (SYSCON support)
Binary 0000=disabled, 0001=16µs, 0010=32µs, 0011=64µs (default),
0100=128µs, 0101=256µs, 0110=512µs, 0111=1024µs,
all others=reserved.
VARB
VMEbus arbitration mode. (SYSCON support)
Binary 0=round robin, 1=priority.
Содержание BajaPPC-750
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