Chapter 5. Mode Select-15H; Command Description - Spectra Logic Spectra S50 User Manual

5 Mode Select—15h

Command Description

The MODE SELECT command allows the initiator to change device parameters of the library.
An initiator uses these parameters to configure the library after power-up or a bus
device reset message. The library parameters that can be set with MODE SELECT are as
follows:
• Element Address Assignments Page (1Dh) has these changeable bits:
• Bytes 2,3
• Bytes 6,7
• Bytes 10,11
• Bytes 14,15
• Transport Geometry Page (1Eh) has no changeable bits
• Device Capabilities Page (1Fh) has no changeable bits
If requested, by setting the SP (save pages) bit in the command descriptor, the library
saves applicable mode parameters to nonvolatile RAM and automatically reloads them
when it initializes, following a reset or power-up.
Any changed parameters apply to all initiators in a multi-initiator environment. If mode
parameters are changed, the library generates a UNIT ATTENTION to all initiators, except the
one that issued the MODE SELECT command, with sense information to indicate that mode
parameters have changed.
Note:
Before issuing any MODE SELECT command, issue a MODE SENSE
command with the Page Code field set to 3Fh, so the T-Series or
50-Series library returns all mode pages, and the Page Control field
set to 01h, so the library indicates which fields are changeable.
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