Avago Technologies LSI20160 - Manual (Page 109)

Using the SDMS Windows 2000 Drivers 5-5
Copyright © 1993–2001 by LSI Logic Corporation. All rights reserved.
5.2.2 Description
The SYMC8XX.SYS , SYM_HI.SYS , SYM_895A.SYS , and SYM_U3.SYS drivers
meet the Microsoft specification for miniport drivers. Miniport drivers
allow the connection of SCSI devices including disk drives, CD-ROMs,
and tape drives for PCI-based machines. To support a new SCSI device,
the Windows 2000 architecture requires that a class driver for that type
device be present (usually supplied by Microsoft, or possibly by the
peripheral manufacturer). No changes to these drivers are required.
The SYMC8XX.SYS , SYM_HI.SYS , SYM_895A.SYS , and SYM_U3.SYS drivers
described by this document support Windows 2000 only. The
SYM_895A.SYS driver is available for Windows 2000 only.
Note: The SYM_HI.SYS driver for Windows NT 4.0 supports the
LSI53C895A (LSI8953U). Additionally, there are other
versions of the
SYMC8XX.SYS , SYM_HI.SYS , and SYM_U3.SYS
drivers that are supported under Windows NT 4.0.
A Windows application passes SCSI commands directly to the SCSI
devices by using the SCSI pass-through facility (refer to the Microsoft
Windows 2000 documentation for details). This facility allows applications
to directly control and access SCSI devices by filling in a data structure
and calling into the port or class driver.
The SYMC8XX.SYS , SYM_HI.SYS , and SYM_895A.SYS drivers support Ultra
SCSI protocol. This protocol provides twice the raw data transfer rate of
Fast SCSI for disk drives and LSI Logic host adapters that support Ultra
SCSI. These drivers also support Ultra2 protocol, providing quadruple
the raw data transfer rate of Fast SCSI.
The SYM_U3.SYS driver supports Ultra160 SCSI protocol providing
speeds up to 160 Mbytes/s data transfer rates using double transition
clocking. Ultra160 also provides CRC, PPR, and Domain Validation. The
Ultra160 SCSI protocol performs 80 megatransfers per second resulting
in approximately double the synchronous data transfer rates of Ultra2
SCSI.
Caution: Ultra SCSI requires more stringent SCSI bus cabling
setups than Fast SCSI, Ultra2, and Ultra160 SCSI require
LVD termination.