SimpleTech ZeusIOPS manual Mode Sense CDB, Code Field Descriptions

MODE SENSE (6) COMMAND (1Ah)

The MODE SENSE (6) command provides a means for a target to report parameters to the initiator. It is a complementary to the MODE SELECT (6) command. See Tables 19 and 20.

Table 19. Mode Sense CDB

Bit	7		6	5	4	3	2	1	0
Byte
0					Operation Code (1Ah)
1	Logical Unit Number (RSVD)				Reserve	DBD		Reserved
2		PC				Page Code
3					Reserved
4					Allocation Length
5					Control

A Disable Block Descriptors (DBD) bit of zero indicates that the target may return zero or more block descriptors in the returned MODE SENSE data, at the target's discretion. A DBD bit of one specifies that the target shall not return any block descriptors in the returned MODE SENSE data. The page control (PC) field defines the type of mode parameter values to be returned in the mode pages. The page code specifies which mode page to return.

Table 20. Page Code Field Descriptions

Page Code	Description	Subclause
00h	Vendor-specific (does not require page format)
01h - 1Fh	See specific device-types
20h - 3Eh	Vendor-specific (page format required)
3Fh	Return all mode pages

ZeusIOPS 3.5-Inch Fibre Channel Solid State Drive Product Manual Rev. 1.0 43