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AL_PA
This sub-section describes the addresses (AL_PA) used on the loop.
AL_PA is a 8-bit character and when encoded to 10 bits, AL_PA has an equal number of ones
or zeros to maintain neutral running disparity.
Table 1.11 shows the AL_PA values and the priority used on the loop.
Details of AL_PA is described in Table 1.9.
Values (hex)
00
01-EF
F0
F1-F6
F7, F8
others
Most common method for the disk drive will be to have the backpanel provide a hard assigned
address.
If the drive failed to obtain a hard assigned address, the drive would obtain the address by soft
assigned method. For details, refer to sub-section (5).
Table 1.11 AL_PA value/priority
Highest priority and assigned for FL_port.
The drive does not assume the existence of this value on the loop.
(because of assuming private loop)
126 valid NL_Port address
01 (highest priority) < ===== > EF (Lowest priority)
Has no priority and used for fairness algorithm and for Loop
Initialization process
not used
reserved for Loop initialization
not used
C141-E054-02EN
Priority & Use
1 - 19
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