User`s guide

EK–KZPBA–UG. B01 1–1
1
Overview
This chapter provides an overview of the KZPBA–CA PCI-to-Ultra SCSI Host Adapter.
The KZPBA–CA is an ultra wide single-ended host adapter.
1.1 Introduction
The KZPBA–CA host adapter module provides the interface between the host
computer’s PCI bus and internal and/or external SCSI devices. The KZPBA–CA
combines a powerful Reduced Instruction Set Computing (RISC) processor, a
SCSI executive processor, and a PCI local bus interface on a single chip.
The KZPBA–CA is a leading edge host adapter that supports bootable devices
and provides a powerful multi-tasking interface. The SCSI bus can be connected
to disk drives, CD-ROM drives, scanners, tape drives, and other SCSI devices.
More than one KZPBA–CA host adapter can be installed in the same host
computer. Each host adapter and its associated SCSI devices form a separate
SCSI bus.
The RISC processor minimizes the overhead of the host computer’s
microprocessor by transferring data directly into the host computer’s memory. It
also manages the actual data transfers between the host computer and the SCSI
devices without involving the host computer’s microprocessor.
The SCSI processor negotiates with each device on the SCSI bus to establish the
data transfer rate between the host adapter and each SCSI device. It also
automates SCSI command processing and significantly reduces the number of
interrupts and command overhead.
The KZPBA–CA is capable of 32-bit bus master data transfers, including PCI
enhanced data transfer commands. The host adapter supports all SCSI-2 and
SCSI-3 functions.