Avago Technologies LSI53C1010R - Manual (Page 23)

Benefits of SURElink (Ultra160 SCSI Domain Validation) Technology 1-5
Version 2.2 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
1.3 Benefits of SURElink (Ultra160 SCSI Domain Validation)
Technology
SURElink technology represents the very latest SCSI interconnect
management solution. It ensures robust and low risk Ultra160 SCSI
implementations by extending the domain validation guidelines
documented in the ANSI T10 SPI-3 specifications. Domain validation
verifies that the system is capable of transferring data at Ultra160
speeds, allowing it to renegotiate to lower speed and bus width if
necessary. SURElink technology is the software control for the
manageability enhancements in the LSI53C1010R. Fully integrated in the
SDMS™ (Storage Device Management System) software solution,
SURElink technology provides domain validation at boot time as well as
throughout system operation. SURElink technology extends to the
Desktop Management Interface (DMI)-based System Management
components of the SDMS software solution, providing the network
administrator remote management capability.
SURElink domain validation provides three levels of integrity checking:
Basic (level 1), Enhanced (level 2), and Margined (level 3). The basic check
consists of an inquiry command to detect gross problems. The enhanced
check sends a known data pattern using the Read and Write Buffer
commands to detect additional problems. Margined check verifies that the
physical parameters have some degree of margin. By varying LVD drive
strength and REQ/ACK timing characteristics, level 3 verifies that no errors
occur on the transfers. These altered signals are only used during the
diagnostic check and not during normal system operation. If errors occur
with any of these checks, the system can drop back to a lower transmission
speed, on a per-target basis, to ensure robust system operation.
1.4 Benefits of LVDlink Technology
The LSI53C1010R supports LVD through LVDlink technology. This
signaling technology increases the reliability of SCSI data transfers over
longer distances than are supported by SE SCSI. The low current output
of LVD allows the I/O transceivers to be integrated directly onto the chip.
LVD provides the reliability of High Voltage Differential (HVD) SCSI without
the added cost of external differential transceivers. Ultra160 SCSI with LVD