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1-2 Using the SYM8953U Host Adapter
the actions of the SCSI and DMA cores. The SCRIPTS processor
executes complex SCSI bus sequences independently of the host CPU.
For more information on the SCSI SCRIPTS Instruction Set used to write
these algorithms, refer to the Symbios SYM53C895A PCI to Ultra2 SCSI
Controller Technical Manual.
This user’s guide, along with the Symbios PCI SCSI Device Management
System SDMS 4.0 User’s Guide, contains a complete library of product
information and installation instructions. With this information, the full
benefits of your SYM8953U PCI to Ultra2 SCSI Host Adapter are
available to you.
1.2 Features
This section provides a high-level overview of the PCI Interface,theSCSI
Interface, and Board Characteristics for the SYM8953U Host Adapter
board.
1.2.1 PCI Interface
• Supports 32-bit DMA bus master with 64-bit addressing
• Burstsupto133Mbytes/s(@33MHz)withzerowait-statebus
master data
• Supports universal 3.3 V and 5 V PCI bus voltage
• Supports 32-bit 33 MHz data bursts with variable burst lengths
• Bursts 2 to 128 dwords across the PCI bus
• Prefetches up to 8 dwords of SCRIPTS instructions
• Supports PCI Write and Invalidate, Read Line, and Read Multiple
commands
1.2.2 SCSI Interface
• Supports 16-bit LVD and SE signaling
• Supports SCRIPTS
– Includes 8 Kbytes RAM for SCRIPTS instruction storage
• Automatically enables LVD or SE termination