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1-2 Using the LSI21003
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
1.2.2 SCSI 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