Vela 2000-0600, Installation And User Manual

Page: 118 / 179

108 CineCast HD Version 2.6 Installation and User Manual
SCSI Command Error Conditions
Sense Data Error Codes
After Power-up, SCSI Reset, or Bus Device Reset
The Vela HD MPEG-2 decoder will respond only with SCSI Status Check Condition
without transfer of data to any SCSI command except
INQUIRY
and
REQUEST SENSE
.
The host adapter (initiator), after seeing the check condition, should respond by
performing a
REQUEST SENSE
. Per the SCSI-2 recommendations, the initiator should
renegotiate for synchronous data transfers and wide transfers. This is done to
enable hot swap capability and proper negotiation for Sync and Wide data.
NOTE: Hot swap is not addressed within the SCSI-2 specification.
After the above, the decoder will respond to the
INQUIRY
,
REQUEST SENSE
, and
TEST
UNIT READY
commands. The decoder will return the Check Condition SCSI Status to
TEST UNIT READY
or any other SCSI command. The host must see the Check Condi-
tion and perform
REQUEST SENSE
at which time the sense data will be:
“Unit Attention, Power On, Reset, or Bus Device Reset Occurred
”
After the initiator has seen the Unit Attention, all valid SCSI commands become
operational. While the decoder is still initializing video and audio hardware for the
DECODER
(45h) command,
MPEG PLAY
(A5h),
MPEG WRITE
(2Ah), and
TEST UNIT
READY
(00h), the decoder will return:
“Not Ready, Logical Unit is in Process of Becoming Ready
”
SCSI Command Error Conditions
The listing below includes the possible values of SCSI Status and sense data on a
SCSI command basis. In addition to the sense values listed below, the decoder
may return other sense values which relate to playback status and MPEG error
reporting. Refer to “Error Reporting,” page 125.
SCSI Status Check Condition
Sense Key 6h
Additional Sense Code and Qualifier 2900h
SCSI Status Check Condition
Sense Key 2h
Additional Sense Code and Qualifier 0401h