LSI LSI22915A, Руководство пользователя, Страница: 16 / 50

1-4 Describing the LSI22915A
Version 1.3 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
1.2.6 Double Transition (DT) Clocking
DT clocking is used to achieve Ultra160 data transfer speed. DT clocking
means transferring data on both rising and falling edges of the request
and acknowledge signals. DT clocking doubles data transfer speeds
without increasing the clock rate.
1.2.7 Cyclic Redundancy Check (CRC)
Ultra160 SCSI includes CRC, which offers higher levels of data reliability
by ensuring complete integrity of transferred data. CRC is a 32-bit
scheme, referred to as CRC-32. CRC is guaranteed to detect all single
bit errors, any two bits in error, or any combination of errors within a
single 32-bit range.
1.2.8 Asynchronous Information Protection (AIP)
The LSI53C1010 also supports AIP, which protects all nondata phases,
including command, status, and messages. CRC, along with AIP,
provides end-to-end protection of the SCSI I/O.
1.3 SureLINK
™
Ultra160 SCSI Domain Validation Benefits
SureLINK Domain Validation represents the 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 Domain Validation controls the manageability enhancements
in the LSI53C1010 PCI to Dual Channel Ultra160 SCSI controller. Fully
integrated in the SDMS software solution, SureLINK technology provides
Domain Validation at boot time, as well as throughout system operation.