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參數(shù)資料
| 型號(hào)： | SYM22902 |
| 英文描述： | SYM22902 PCI to Ultra2 SCSI Dual Channel low profile PCI host adapter user＇s guide v1.0 |
| 中文描述： | SYM22902 PCI到Ultra2的SCSI雙通道高PCI主機(jī)適配器用戶(hù)指南1.0版 |
| 文件頁(yè)數(shù)： | 16/88頁(yè) |
| 文件大?。?/td> | 1211K |
| 代理商： | SYM22902 |
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1-6
Using the SYM22902 Low Profile PCI Host Adapter
1.4 TolerANT
Technology
The SYM53C896 features TolerANT technology, which includes active
negation on the SCSI drivers and input signal filtering on the SCSI
receivers. Active negation causes the SCSI Request, Acknowledge,
Data, and Parity signals to be actively driven HIGH rather than passively
pulled up by terminators. Active negation is enabled by setting bit 7 in
the SCSI Test Three (STEST3) register. Refer to the LSI Logic
Symbios
SYM53C896 PCI to Dual Channel Ultra2 SCSI Multifunction Controller
Technical Manual
for specific register information.
TolerANT receiver technology improves data integrity in unreliable
cabling environments, where other devices would be subject to data
corruption. TolerANT receivers filter the SCSI bus signals to eliminate
unwanted transitions, without the long signal delay associated with
RC-type input filters. This improved driver and receiver technology helps
eliminate double clocking of data, the single biggest reliability issue with
SCSI operations. TolerANT input signal filtering is a built-in feature of the
SYM53C896 and all LSI Logic fast SCSI, Ultra SCSI, and Ultra2 SCSI
devices.
The benefits of TolerANT technology include increased immunity to noise
when the signal is going HIGH, better performance due to balanced duty
cycles, and improved fast SCSI transfer rates. In addition, TolerANT SCSI
devices do not cause glitches on the SCSI bus at power-up or
power-down, so other devices on the bus are also protected from data
corruption. When it is used with the LVD Link transceivers, TolerANT
technology provides excellent signal quality and data reliability in real
world cabling environments. TolerANT technology is compatible with both
the Alternative One and Alternative Two termination schemes proposed
by the American National Standards Institute.
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