Figure 14-21. 80960Jx System With 80960 Local Bus, Pci Local Bus And Local Bus For High End Microprocessor - Intel i960 Jx Developer's Manual

EXTERNAL BUS
Buses such as the PCI (Peripheral Component Interconnect) local bus connect to the 80960 bus
through a bridge chip, which employs DMA, FIFOs and mailboxes for bus-to-bus communication.
The PCI local bus can connect shared buffer memory and high performance I/O devices. The
bandwidth of the PCI local bus is particularly appropriate for bridge interfacing to high-end
processors such as the Pentium (R) microprocessor, as illustrated in Figure 14-21. In this way, the
i960Jx can improve the performance of complex systems such as servers by sparing the main
system CPU and its local memory the task of buffering low-level I/O.
Base
i960 Jx Local
Memory I/O
Processor
80960 Local Bus
High-Perf
Cache
Bridge
I/O
Memory
PCI Local Bus
High-End Local Base
Bridge
CPU Memory I/O
Microprocessor Local Bus
Figure 14-21. 80960Jx System with 80960 Local Bus, PCI Local Bus and Local Bus for High
End Microprocessor
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