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Channel In terf ace
7942 and 7946
Table 2-1. Device Command Summary (continued)
DESCRIBE
(GENERAL PURPOSE)
FUNCTION:
Directs the device to return information about itself.
OPCODE:
FORMAT:
No variables or parameters
INITIALIZE MEDIA
(GENERAL PURPOSE)
FUNCTION:
OPCODE:
FORMAT:
Initializes all the data fields of
the currently selected
unit.
<00110111>
<OOOOOCWZ>Pl
< P2
P1
=
initialize options byte
Options for disc media:
CWZ
000
Retain both factory (primary) and field
(secondary) spares
CWZ
001
Retain factory spares only
CWZ
010
Retain no spares (f
0
r CE use only)
P2
=
Block interleave byte
SET RPS
(COMPLEMENTARY)
FUNCTION:
OPCODE:
FORMAT:
2-6
Sets time-to-target and window-size time intervals for RPS
data transfers. The command is accepted but the RPS function
is not implemented.
<00111001>
< TIME 1>
< TIME 2 >
TIME 1
TIME 2
time-to-target in hundreds of microseconds
window size in hundreds of microseconds
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