M2488 PRODUCT GUIDE
MEDIA CHANGER COMMANDS
March 1997
CG00000-011503 REV. A
6-9
MODE SELECT Parameter Header
The four bytes of the Mode Parameter Header are shown in Table 6-6.
The block descriptor is not supported for the Medium Changer so its length must be specified as
00h.
Page Descriptors
Following the parameter list header are the MODE SELECT pages.
If the initiator sends an incorrect length in the Page Length field or sends page fields with values
that are not supported by the target or are not changeable, the target returns a CHECK CONDI-
TION status with the sense key field set to ILLEGAL REQUEST in the sense data. In this case, no
parameters are changed by this command.
Table 6-6. MODE SELECT Mode Parameter Header
BITS
BYTES
7
6
5
4
3
2
1
0
0
Reserved
1
Reserved
2
Reserved
3
Block Descriptor Length (00h)
Table 6-7. Page Descriptors
BITS
BYTES
7
6
5
4
3
2
1
0
0
PS=0
Reserved
Page Code
1
Additional Page Length
2-N
Page Defined or Vendor Unique Parameter Bytes
Table 6-8. Page Descriptor Field Description
BYTE
BIT
VALUE
DESCRIPTION
0
0-5
The Page Code field identifies the format and parameters for that page. For Medium
Changer LUNs, this controller supports page 1Dh (Element Address Assignments),
1Eh (Transport Geometry Parameters), 1Fh (Device Capabilities Page), and 00h
(Vendor Unique Parameters)
0
7
0
When using a MODE SELECT command, the PS (Parameters Savable) bit is
reserved and must be zero.
1
0-7
The additional page length indicates the number of bytes in that page. The additional
page length field value does not include bytes 0 and 1 of that page (the page code
and additional page length fields, respectively).
Содержание M2488
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Страница 57: ...M2488 PRODUCT GUIDE INSTALLATION INSTRUCTIONS April 1997 CG00000 011503 REV A 1 31 Figure 1 25 Replace Covers ...
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