Specifications

VSBC-6862 Rev 1.43
104
VMBA VME Master Bus Access RW
CS4 + $1051
This register permits to select the mode for VME bus access and release
D8 D9 D10 D11 D12 D13 D14 D15
Value
RM RL1 RL0 x x x x x
Default
1 1 1 x x x x x
With:
RL1 RL0 Request Level
0 0 Bus Request 0
0 1 Bus Request 1
1 0 Bus Request 2
1 1 Bus Request 3
RM Release Mode
0 Release On Request
1 Release When Done
VAM VME Arbiter Mode RW
CS4 + $1053
This register permits to select the arbiter mode when board is in Slot1 mode
D8 D9 D10 D11 D12 D13 D14 D15
Value VAM1 VAM0 x x x x x x
Default 0 1 x x x x x x
With:
VAM1 VAM0 Arbiter Mode
0 0 SGL: Single Level, only level 3 arbitration
0 1 PRI: Priority, the level 3 is as the higher priority
1 0 RRS: Round-Robin: the levels rotates between lines
1 1 reserved

Please modify this register when no activity on the bus.
Modifying Arbiter Mode when activity in VME bus may cause erratic results.
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