LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 17

• Manufacturer Part Number: LSI53C875
• Description: PCI to Ultra SCSI I/O Processor
• Manufacturer: LSI Logic

A block diagram of the LSI53C875 is pictured in
Figure 1.2
External
The LSI53C875 integrates a high-performance SCSI core, a 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 is
designed to implement multithreaded I/O algorithms with a minimum of
processor intervention, solving the protocol overhead problems of
previous intelligent and nonintelligent adapter designs.
The LSI53C875 is fully supported by the LSI Logic Storage Device
Management System (SDMS™), a software package that supports the
Advanced SCSI Protocol Interface (ASPI) and the ANSI Common
Access Method (CAM). SDMS software provides BIOS and driver
support for hard disk, tape, removable media products, and CD-ROM
under the major PC operating systems.
Memory
Memory
Memory
Control
Local
Bus
536 Bytes
LSI53C875 Chip Block Diagram
FIFO
Data
PCI Master and Slave Control Block
SCSI FIFO and SCSI Control Block
Processor
SCRIPTS
SCSI
SCSI Bus
PCI
TolerANT Drivers and Receivers
Operating
Registers
Configuration
Figure
Registers
1.2.
SCRIPTS
RAM
1-3