Maxtor 10K V ユーザーズマニュアル

6-12  Maxtor Atlas 10K V

This is an open-loop method of compensating for some of the signal loss that is most 
severe on the first part of a signal’s transition.

FRC is used to improve integrity of the clock signal by removing inter-symbol 
interference (ISI). By having a clock running at a constant neutralized. The free 
running clock is restricted for use with DT information unit transfers at 320 megabytes 
per second.

Skew compensation of data signals relative to the clock signal; an Ultra320 SCSI 
device can establish skew compensation simultaneously for each of the received 
transitions on the data lines so that they occur at the correct time relative to the clock.

IUT (or “IU Transfers,” also known as “packetized transfers”) is a method to 
encapsulate non-data information (like commands sent from the initiator to the target 
and status sent from the target to the initiator) into packets and transfer those packets 
at the maximum negotiated data rate of up to 320 megabytes per second. A method 
to transfer packets for a number of I/O processes without an intervening physical 
disconnection. A method to minimize overhead by eliminating several bus phase 
changes per I/O process.

The Maxtor Atlas 10K V SCA low voltage differential (LVD) disk drives are designed 
for use in “Hot Swap” applications within a properly designed and configured SCSI 
system. With care, system integrators can design storage arrays and/or SCSI buses 
using Maxtor Atlas 10K V disk drives that are “Hot Swap Case 4" tolerant.

Case 4 is defined as follows:

• Devices are powered and the bus may have active I/O processes 

ongoing, but the device being removed or inserted must be idle (no 
ongoing I/O processes during the insertion/removal).

• Ground connections to the drive must be made and maintained for 1 

millisecond before, during, and 1 millisecond after the insertion/
removal. The SCA-2 connector used on the Maxtor Atlas 10K V disk 
drive meets this requirement.

• Device circuitry connected to bus pins must remain “glitch” free during 

power up or power down. 

Note:

In a multimode environment, any insertion or removal that changes 
the bus mode causes a transceiver mode change reset event.