Appendix C. Negotiated Rate Information Page Reference
C–2Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
Table C–2 Transfer Period Factor Field Values When PARL = 0
Code Description
00h – 09h Reserved.
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).
OCh 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).
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 greater than or equal to 50 ns).
19h – 31h Transfer period = the period factor x 4 (Fast-10 data is latched using a transfer period
of less than or equal to 196 ns and greater than or equal to 100 ns).
32h - FFh Transfer period = the period factor x 4 (Fast-5 data is latched using a transfer period
of less than or equal to 1020 ns and greater than or equal to 200 ns).
C.2 SETTINGS FOR THE QAS, DT, AND IU FIELDS
Table C-3 provides valid bit combinations for the QAS, DT, and IU fields of the INQUIRY
command’s Negotiated Rate Information Page (Section 5.11.2.7 of this manual). Only the
combinations shown in the table are valid; all other combinations are reserved.
Table C–3 Settings for the QAS, DT, and IU Fields of the Negotiated Rate Information Page
(INQUIRY Command)
QAS DT IU Description
000Selects Single Transition phases. Use ST DATA IN and ST DATA OUT phases to
transfer data
010Use DT DATA IN and DT DATA OUT phases with data group transfers.
011Use DT DATA IN and DT DATA OUT phases with information unit transfers.
111Use DT DATA IN and DT DATA OUT phases with information unit transfers and
use QAS for arbitration.