Mylex DAC960PG, Installation Manual

Page: 25 / 106

Manual No. 771971 2-1
Chapter 2
Functional Description
Overview
Figure 2-1. System Diagram
Controller Components
The I960 RP Processor
The Intel 80960RP processor chip is the heart of the DAC960PG controller.
The i960 RP is a CPU that arbitrates the primary and secondary PCI busses,
the Ultra-SCSI interface, cache memory control, firmware control, and
NVRAM data; thereby freeing the host’s CPU for other tasks.
The RP of the i960 RP designation represents the part of the chip that
contains an interface between the primary PCI bus (PCI connection to host)
and the secondary PCI bus. The secondary PCI bus is routed to one, two, or
three Mylex BA-81C15 PCI to Ultra SCSI Host Adapter Chips (one chip for
each Ultra-SCSI channel).
The i960 RP contains a memory controller that is used to control the
firmware flash EEPROM and the NVRAM. The i960’s memory controller is
not used to control the cache memory in this application.