The Education of MassiveProng (Pt 3 of 275) (001/634) (587/634)

by external PCI masters are controlled by external request/grant
signals. Arbitration is based on a fair rotation scheme and allows for
one master agent to be assigned as a super agent. The arbiter supports
locked cycles by implementing a PCI bus lock.

The PPU contains an internal wholly on-chip fast-AT bus 904 that is
similar to the ISA bus. However, the on-chip fast-AT bus is
dynamically programmable and runs at higher than typical ISA bus
speeds. Fast-AT bus speeds, for IDE accesses and non-IDE accesses, can
be independently programmed to run at 1/2, 1/3, or 1/4 the PCI clock
.