Negotiated Rate Information; Transfer Period Factor Field - Maxtor ATLAS 15K II Product Manual

NEGOTIATED RATE INFORMATION PAGE
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
00h – 07h
08h
09h
0Ah
0Bh
OCh
Reserved.
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.
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.
Transfer period = 25 ns (Fast-40 or Ultra2 data is latched every 25 ns).
Transfer period = 30 ns (Fast-40 data is latched every 30 ns).
Transfer period = 50 ns (Fast-20 data is latched using a transfer period
of less than or equal to 96 ns and greater than or equal to 50 ns).
Appendix B
REFERENCE
Description
Maxtor Atlas 15K II
B-1