Logic User's Guide Symbios SYM8953U PCI to Ultra2 SCSI Host Adapter

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
Interface Descriptions 1-3
• Contains external 68-pin High Density (HD) and internal 68-pin HD
latching connectors
• Performs wide Ultra2 SCSI LVD synchronous transfers up to
80 Mbytes/s
• Supports SCSI synchronous offset up to 31
• Provides SCSI termination power (TERMPWR) source with
autoresetting circuit protection device
• Supports SCSI Configured AutoMatically (SCAM) Level 1 Capability
(Set “OFF” by default)
• Utilizes flash ROM for BIOS storage for up to 256 Kbytes
• Supports variable block size and scatter/gather data transfers
• Performs complex SCSI bus sequences without interrupts, including
restore data pointers
• Has serial EEPROM for user configuration utility
• Has SCSI bus activity LED connector and on-board LED
1.2.3 Board Characteristics
• PCI board dimensions,
152.4 x 88.90 mm (6.00 x 3.5 inches)
• PCI Universal 32-bit card edge connector
• HD 68-pin external connector
• HD 68-pin internal connector
A mechanical drawing showing board dimensions and component layout
is located in Appendix A, “Technical Specifications”.
1.3 Interface Descriptions
This section provides a more detailed explanation about the PCI
Interface, the SCSI Interface, Ultra2 SCSI Technology, and LVD Link™
=
Technology.