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SCSI Commands

Quantum DLT 8000 Tape System 5-79

MODE SELECT Command (6) / (10) (15h) / (55h) (continued)

Table 5–38 Mode Parameter Block Descriptor — Field Descriptions (continued)

Field Name Description

Block Length This field specifies the length, in bytes, of each logical block transferred

over the SCSI bus. A block length of 0 indicates that the length is variable

(specified in the I/O command). Any value other than 0 indicates the

number of bytes per block to use for READ, WRITE, and VERIFY

commands that specify a “fixed” bit of 1 (i.e., fixed block mode) which

also causes the transfer length in the command descriptor block to be

defined as a block count. If fixed bit is not equal to 1, this field is

ignored.

5.9.1.3 Mode Page Descriptors

Following the MODE SELECT command’s Mode Parameter Block Descriptor are the

MODE SELECT pages, each of which sets a different device parameter. Each mode page

has a 2-byte header that identifies the page code and indicates the number of bytes in

that page.

Bit

Byte

7 6 5 4 3 2 1 0

0 PS (0) 0 Page Code

1 Additional Page Length

2 - n Page-Defined or Vendor Unique Parameter List

Figure 5–40 MODE SELECT Page Descriptor — Data Format

Table 5–39 MODE SELECT Page Descriptor — Field Descriptions

Field Name Description

PS Parameters Savable. For the MODE SELECT (6) (10) commands, this

field is reserved (0).

Additional Page Length Indicates number of bytes in that page (not including bytes 0 and 1).

Page-Defined or Vendor

Unique Parameter List

Information in this field depends on the mode page. Refer to Sections

5.9.2 through 5.9.9.

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Quantum DLT 8000 Manual Pagina 223