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”

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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.

LSI53C875A PCI to Ultra SCSI Controller

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LSI 53C875A technical manual Chapter General Description