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User’s Guide 21020285 D
Chapter 4 Command Operation
Some Example Single Commands Page 4 - 17
6. Read the Hardware Status Port at address EE10H. Since the ENT bit of
the Status Port toggles between 0 and 1 with each Single Command
Channel Attention issue, the value returned could be 0202H or 0203H
depending on the previous value. We'll assume this is the first command
after a reset; the initial value of the ENT bit is 0. The adapter is ready if
the Status Port reads 0202H.
7. To execute the command, write a 0 to the Channel Attention Port.
8. When the command has completed, the Status Block will be written to
memory and an interrupt generated by the RF3880 adapter. Read the
Flags byte of the Status Block to determine if there are errors, or retries
associated with the command.
Figure 17 Single Command Structure in memory