Commands90
Sub-page 04h—Report Transfer Capabilities
Transceiver Mode The current bus mode:
Code Bus Mode
00b Unknown
01b SE
10b LVD
11b HVD (Note that this will never be reported since the drive will
not operate on an HVD bus)
Sent PCOMP_EN The value of the PCOMP_EN bit sent. This will be set if PCOMP_EN has
been negotiated successfully.
Received PCOMP_EN The value of the PCOMP_EN bit received. This will be set if PCOMP_EN has
been negotiated successfully.
7 6 5 4 3 2 1 0
0 Minimum Transfer Period Factor (08h)
1 Reserved (0)
2 Maximum Req-Ack Offset (40h)
3 Maximum transfer Width Exponent (1)
4 Protocol Option Bits Supported (C3h)
5
Reserved (0)
7
Minimum Transfer Period Factor 08h The smallest value of the transfer period factor supported. For
Gen 3 SCSI, this is 8, in other words, FAST160.
Maximum Req/Ack Offset 40h The maximum value for the Req/Ack offset. For Gen 3 SCSI, this
is 64 (40h).
Maximum Transfer Width
Exponent
1 The maximum width supported. For Gen 3 SCSI, this is 1.
Protocol Option Bits Supported C3h. The protocol options supported. The value of C3h indicates that
PCOMP_EN, RTI, DT_REQ and IU_REQ are supported and
RD_STRM, WR_FLOW, HOLD_MCS and QAS_REQ are not.
See the Protocol Options Bits field on sub-page 03h (Negotiated
Settings) on page 89 for details of the bits.
