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LSI53C875A PCI to Ultra SCSI Controller 1-1
Chapter 1
General Description
Chapter 1 is divided into the following sections:
• Section 1.1, “New Features in the LSI53C875A”
• Section 1.2, “Benefits of Ultra SCSI”
• Section 1.3, “TolerANT
®
Technology”
• Section 1.4, “LSI53C875A Benefits Summary”
The LSI53C875A PCI to Ultra SCSI Controller brings Ultra SCSI
performance to host adapter, workstation, and general computer designs,
making it easy to add a high-performance SCSI bus to any PCI system.
It supports Ultra SCSI transfer rates with Single-Ended (SE) signaling for
SCSI devices.
The LSI53C875A has a local memory bus for local storage of the
device’s BIOS ROM in flash memory or standard EEPROMs. The
LSI53C875A supports programming of local flash memory for updates to
BIOS. Chapter 6, “Electrical Specifications,” has the chip package and
BGA specifications. Appendix B, “External Memory Interface Diagram
Examples,” has system diagrams showing the connections of the
LSI53C875A with an external ROM or flash memory.
The LSI53C875A integrates a high-performance SCSI core, a 64-bit PCI
bus master DMA core, and the LSI Logic SCSI SCRIPTS™ processor to
meet the flexibility requirements of SCSI-3 and Ultra SCSI standards. It
implements multithreaded I/O algorithms with a minimum of processor
intervention, solving the protocol overhead problems of previous
intelligent and nonintelligent adapter designs.
Figure 1.1 illustrates a typical LSI53C875A system and Figure 1.2
illustrates a typical LSI53C875A board application.