Enable Mailbox Out Available Interrupt (Operation Code 05) - Adaptec AHA-1740A Technical Reference Manual

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Byte Description
01 Special Options Identification
The value in this byte indicates
what special options are
supported on the AHA-
1740A/1742A/1744 host
adapter. Other host adapters
use other values in this byte.
02 Firmware Revision Level (First
byte)
This value indicates an ASCII
value from 0-9, that indicates
the first digit of the firmware
base code revision installed in
the AHA-1740A/1742A/1744.
03 Firmware Revision Level
(Second byte)
This value indicates an ASCII
value from 0-9, that indicates
the second digit of the firmware
base code revision installed in
the AHA-1740A/1742A/1744.
After completing this command, HACC will be asserted, indicating normal
completion.

Enable Mailbox Out Available Interrupt (Operation Code 05)

The Enable Mailbox Out Available Interrupt command specifies that a Mailbox Out
Available interrupt should be generated whenever a Mailbox Out entry has been
cleared by the host adapter. One byte of outbound data is transmitted to indicate
whether the interrupt should be enabled or disabled.
Byte 0
After completing this command, HACC will NOT be asserted to avoid generating ad-
ditional interrupts. If the data byte is neither 00 nor 01, INVDCMD will be asserted
indicating an invalid command. In this case, HACC will also be asserted.
The Mailbox Out Available interrupt is normally intended to be used by the host as
an indicator that a Mailbox Out entry is available. This function should only be en-
abled if all Mailbox Out entries have been found full by the host. It should be dis-
abled soon afterward. If used in other ways, the interrupt may generate a large
number of relatively useless interrupt handling activities.
5-4
Enable/Disable Parameter: The Enable/Disable parameter byte must
be either 00h or 01h. If the Enable/Disable parameter byte is 00h,
the Mailbox Out Available interrupt is not returned. If the Enable/
Disable parameter byte is 01h, the Mailbox Out Available interrupt
is returned as soon as a Mailbox Out has been cleared by the host
adapter.
AHA-1740A/1742A/1744
Value Meaning
41h ('0' ASCII) Board is standard model
All Others Reserved