System90IXS Bus Configuration Rules
Bus configuration rules are required for a numbez of reasons. Rules are required to ensure a balance of
system resources that minimize perfonnance bottlenecks. Rules are required to ensure that each module
is installed in a bus slot with enough priority to prevent module starvation in the event of bus resource
overload. Rules are required by cabling restraints that require that certain modules JlC.in$talled .in certain
slots. And rules are required to ensure that the power supply is not overloadc(L '.~".'
This paper covers configuration rules that deal with the balancing of system',iesoW'ces. and the assignment
of modules to ess and esslXA Bus slots.
The Bus Arbiter allocates ess or eSS/XA Bus resources to requesters according to requester priority.
The priority of a requester is determined by the bus slot it|