Maxtor 10K III - page 265

Maxtor Atlas 10K III B-1
This appendix provides information about the INQUIRY command’s Negoti ated
Rate Information Page that is not provide d in Section 5.11.2.7. Specifically, it
provides the codes and meanings for the Tran sfer 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).
Table B-1 provides the codes and meanings allowed for the Transfer Period Fac tor
field if th e value of PARL (Parall el Protocol, bit 2 of byt e 6 of the Negotiate d Rate
Information Page) is 1.
Table B-2 provides the allowable codes when the value of PARL = 0.
Transfer Period Factor Field Values When PARL = 1
00h – 08h Reserved.
09h Transfer period = 12.5 ns (Fast-80 is latched every 12.5 ns). This code
is va lid only if the protoc ol opt io ns bits (QAS , DT, and IU) of t he pa g e
have values s elected that support double transit ion (DT) data transfers.
0Ah Transfer period = 25 ns (Fast-40 data is latched every 25 ns).
0Bh Transfer period = 30 ns (Fast-40 data is latched every 30 ns).
O Ch Tran sfer period = 5 0 ns ( Fast- 20 da ta is latched us in g a t rans fe r period
of less than or equal to 96 ns and greater than or equal to 50 ns).
0Dh – 18h Transfer period = the period factor x 4 (Fast-20 data is latched using a
transfer period of less than or equal to 96 ns and great er than or equal
to 50 ns).
19h – 31h Transfer period = the period factor x 4 (Fast-10 data is latch ed usi ng a
transfer period of l ess than or eq ual to 196 ns an d greater than or equal
to 100 ns).