Maxtor Atlas 10K V B-1
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-1 provides 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-2 provides the allowable codes when the value of PARL = 0.
Table B-1 Transfer 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).
