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Symbios SYM8953U PCI to Ultra2 SCSI Host Adapter 1-1
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Chapter 1
Using the SYM8953U
Host Adapter
This chapter describes the SYM8953U Host Adapter interface to PCI
computer systems and includes these topics:
• Section 1.1, “General Description,” page 1-1
• Section 1.2, “Features,” page 1-2
• Section 1.3, “Interface Descriptions,” page 1-3
1.1 General Description
The LSI Logic Corporation Symbios
®
SYM8953U PCI to Ultra2 SCSI
Host Adapter board provides an Ultra2 SCSI interface to PCI computer
systems. It is referred to as the SYM8953U throughout this guide.
Installing this adapter in your PCI system allows connection of up to 15
SCSI devices.
The SYM8953U board is a 16-bit, Low Voltage Differential (LVD)/Single-
Ended (SE) SCSI solution for your computer. This board also supports
legacy Fast SCSI and Ultra SCSI devices, and the newest LVD Ultra2
SCSI devices. It is also backwards compatible with existing wide SCSI
applications for the SYM8251S and SYM8751SP/E host adapters.
Symbios SCSI Device Management System (SDMS™) software
operates the board. SCSI software provided by other vendors that works
with the SYM53C895A chip can also be used. BIOS support for this
adapter is incorporated on the board in a Flash memory device. The
SYM8953U host adapter has a serial EEPROM device for storing the
user’s SCSI bus configuration.
The SYM53C895A chip also contains a SCSI SCRIPTS™ processor that
permits both DMA and SCSI commands to be fetched from host memory
or internal SCRIPTS RAM. Algorithms written in SCSI SCRIPTS control