Model 466-1 Adapter
30 VMEbus Adapter Card Configuration
4.7 Bus Grant And Bus Request Jumpers
The
Bus Grant
(
BGO-BGI
) jumper block and the
Bus Request
(
BR
) jumper
block establish the VMEbus adapter card
Bus Grant
and
Request
levels.
If the VMEbus system has a system controller, the adapter card can be
configured to use any of the four bus request/bus grant levels. If there is no
system controller in the VMEbus system, the Model 466-1 adapter can be set
to become a single-level arbiter on level three or a four-level arbiter in priority
or round-robin mode.
The
ARB
jumper enables the arbitration feature of the adapter card to
drive the four bus grant lines (BGxIN) and bus clear (BCLR).
The
P/R
jumper selects the arbitration mode. When the jumper is OUT,
priority arbitration is selected. When the jumper is IN, round-robin
arbitration is selected.
If the adapter card is to be system controller, it must be installed in slot 1
of the VMEbus chassis. Jumpers 4 (SYSCLK Drive) and 5 (SYSRESET
Drive) in the
SYS
block should be installed. Jumper 6 (TIMEOUT)
should also be installed unless another module provides TIMEOUT. See
also
SYS
block diagram and description of jumpers in section 3.4.1.
If the VMEbus adapter card
is to be the system controller
, configure the
jumpers as follows:
Jumper IN: -------
Jumper OUT:
3
2
1
0
0
1
2
3
ARB
P/R
Содержание 466-1
Страница 1: ...Model 466 1 Adapter Hardware Manual Connects a SBus Computer to a VMEbus System...
Страница 2: ...Model 466 1 Adapter ii...
Страница 24: ...Model 466 1 Adapter 14 Adapter Functions...
Страница 52: ...Model 466 1 Adapter 42 VMEbus Adapter Card Configuration...
Страница 70: ...Model 466 1 Adapter 60 CSR Accessed From The SBus...
Страница 88: ...Model 466 1 Adapter 78 Common Problems And Solutions...
Страница 106: ...Model 466 1 Adapter 96 Jumper Configuration Worksheets...
Страница 107: ...Model 466 1 Adapter Jumper Configuration Worksheets 97 D 1 SBus Adapter Card Worksheet J1...
Страница 108: ...Model 466 1 Adapter 98 Jumper Configuration Worksheets...
Страница 110: ...Model 466 1 Adapter 100 Jumper Configuration Worksheets...