Appendix B NEGOTIATED RATE INFORMATION PAGE REFERENCE

This appendix provides information about the INQUIRY command’s Negotiated Rate Information Page that is not provided in Section 5.11.2.7. Specifically, it provides the codes and meanings for the Transfer Period Factor field (byte 4) and a table that explains the allowable settings for the QAS, DT, and IU fields (bits 2, 1, and 0, respectively, of byte 7).

B.1 TRANSFER PERIOD FACTOR FIELD

 

Table B-1provides the codes and meanings allowed for the Transfer Period Factor

 

field if the value of PARL (Parallel Protocol, bit 2 of byte 6 of the Negotiated Rate

 

Information Page) is 1.

 

Table B-2provides the allowable codes when the value of PARL = 0.

 

Table B-1Transfer Period Factor Field Values When PARL = 1

Code

 

Description

 

 

 

00h – 07h

 

Reserved.

 

 

 

08h

 

Transfer period=6.25ns (Fast160 or U320 is latched every 6.25 ns)

 

 

This code is valid only if the protocol options bits (QAS,DT and IU) of

 

 

the page have values selected that support double transition (DT) Trans-

 

 

fers.

 

 

 

00h – 08h

 

Transfer Period=6.25ns (Fast160 or U320 is latched every 6.25 ns)

 

 

This code is valid only if the protocol options bits (QAS,DT and IU) of

 

 

the page have values selected that support double transition (DT) Trans-

 

 

fers.

 

 

 

09h

 

Transfer period = 12.5 ns (Fast-80 or U160 is latched every 12.5 ns).

 

 

This code is valid only if the protocol options bits (QAS, DT, and IU) of

 

 

the page have values selected that support double transition (DT) data

 

 

transfers.

 

 

 

0Ah

 

Transfer period = 25 ns (Fast-40 or Ultra2 data is latched every 25 ns).

 

 

 

0Bh

 

Transfer period = 30 ns (Fast-40 data is latched every 30 ns).

 

 

 

Maxtor Atlas 10K V B-1