1.2 Features

This section provides a high level overview of the PCI Interface, the SCSI Interface, and Board Characteristics for the LSI21003.

1.2.1 PCI Interface

The PCI interface includes these features:

•True PCI multifunction controller for maximum performance

•32-bit (33 MHz) DMA bus master

•Bursts up to 128 Dwords across the PCI Bus

•Zero wait-state bus master data bursts up to 110 Mbytes/s (@ 33 MHz)

•Prefetches up to 8 Dwords of SCRIPTS™ instructions

•PCI Universal 3.3 V/5 V bus support

•Supports PCI write and invalidate, read line, and read multiple commands

1.2.2SCSI Interface

The SCSI interface includes these features:

•Two separate SCSI channels

•Ultra160 SCSI LVD synchronous transfers as fast as 160 Mbytes/s (Channel B)

•Wide Ultra SCSI SE synchronous transfers as fast as 40 Mbytes/s (Channel A)

•SCSI synchronous offset up to 31

•Supports variable block size and scatter/gather data transfers

•16-bit SE/LVD

•Four connectors:

–50-pin high density for the external Channel A

–50-pin narrow (ribbon) for internal Channel A

–68-pin high density for internal Channels A and B

1-2

Using the LSI21003