TLH10747 – 17

FIGURE 7b Phase 1 Arbitration State Diagram

Note 1

Idle Bus Arbitration during Phase 1 is not an internal state of the Arbitration Controller It is shown in this state diagram only to give a better understanding

of Phase 1 arbitration

Note 2

One bit on the parallel data bus is driven by external logic (the arbitration controller only drives the IBA

CMPT output) only if IBA is supported by the

module Note that the arbitration controller does not require AS

DS

DI

Note 3

If a module does not want IBA to select a new master external logic around the arbitration controller will drive di

This transition is shown in this diagram

to allow a clearer understanding of how IBA relates to normal arbitration

Note 4

Note 5

These Requests must have occurred before APO was asserted or they will not compete until the next arbitration cycle

Note 6

Note 7

All conditions shown above the Phase 1 state must be completed before driving ARO

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