Fujitsu M2488 manual Block Descriptor Field Description, Descriptor 49. Page Descriptors

TAPE UNIT SCSI COMMANDS

M2488 PRODUCT GUIDE

Table 4-48.

Block Descriptor Field Description (Continued)

BYTE

BIT

VALUE

DESCRIPTION

5-7

The Block Length field specifies the length in bytes of each logical block

described by the block descriptor. A block length of 0 indicates the length

is variable. Reference the READ BLOCK LIMITS command description

for the minimum and maximum block lengths supported.

Page Descriptor:

Table 4-49. Page Descriptors

BITS

BYTES

7

6

5

4

3

2

1

0

0

PS=0

Reserved

Page Code

1

Additional Page Length (see section 5-2 on page 5-1)

2 - N

Page Defined or Vendor Unique Parameter Bytes

Table 4-50. Page Descriptor Field Description

BYTE	BIT	VALUE		DESCRIPTION
0	0-5			Following the block descriptor (if supplied) are MODE SELECT pages.
				The Page Code field identifies the format and parameters for that page.
				This controller supports pages 01h (Error Recovery and Reporting), 02h
				(Disconnect/Reconnect control), 0Ah (Control Mode Page), 10h (Device
				Configuration Parameters) and 00h (Vendor Unique Parameters).
0	7		0h	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). If
				the initiator does not set this value to the value that is returned for the page
				by the MODE SENSE command, the target will present CHECK CONDI-
				TION status with the sense key set to ILLEGAL REQUEST and the addi-
				tional sense code set to INVALID FIELD IN PARAMETER LIST.

If the initiator sends page fields with values that are not supported by the target or are not Change- able, the target returns a CHECK CONDITION status with the sense key field set to ILLEGAL REQUEST in the sense data. In this case, no parameters are changed by this command.

More information on the MODE SELECT command can be found in paragraph 5-2 on page 5-1.

4-54 CG00000-011503 REV. A April 1997