Action Codes - IBM DCAS-32160 - Ultrastar 2.1 GB Hard Drive Specifications

10.4 Action codes

The following Action codes are supported.
First quintet Second quintet
11000b
10001b
10100b
others
note. cc is the count of zero bits in nnn.
Figure 134. Action codes
Assign ID An action code is valid if the check bits are correct and both quintets are received. ID assign-
ment action codes shall also specify an ID that the device can support. Isolated device(s) perform a valid
action code when it is received. Transfer cycles after a valid action code and preceding the next synchro-
nization pattern shall be ignored.
Clear priority flag This action code instructs the isolated device(s) to clear the priority flag. This function
is typically used when the SCAM initiator wishes to defer the assignment of an ID to the isolated
device(s) until a later function sequence.
Locate On and Off These action codes instruct the isolated device(s) to provide assistance for user or
service personnel to physically locate the device. Locate on shall make the led turned on and Locate off
shall make the led turned off.
Description
ccnnnb Assign ID 00nnnb
ccnnnb Assign ID 01000b
11000b Clear priority flag
10010b Locate on
01011b Locate off
others Reserved
Reserved
183
SCAM