Specifications

BIOS Configuration
3 3
3-17
Arbitration Priority:
Use this option to set the arbitration priority. Possible values are 0, 1, 2, and 3, with a
value of 0 indicating the highest priority. This determines which VMEbus request
signal the EPC-8 uses when it accesses the VMEbus.
Arbitration Mode:
Use this option to select the arbitration mode. Possible values are ‘‘Round Robin’’ or
‘‘Priority.’’ This determines how the EPC-8 performs bus arbitration when it is the
VMEbus Slot-1 controller. If round-robin is selected, the four bus request lines have
equal priority. If Priority is selected, bus request 0 has highest priority.
Bus Release:
Use this option to select the Bus Release mechanism. Possible values are RONR
(VXI) and ROR (VME).
ULA:
Use this option to select the unique logical address (ULA). Possible values range from
00 through FF.
The logical address controls where in the VME A16SD space the EPC-8 extended
registers are mapped. If the ULA=0, the registers are at C000. If the ULA=FF, the
registers are at FFF0. In general, the registers map to [C000 + (ULA*20)] (all
numbers in hexadecimal).
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