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|  MIL-D-81347C(AS)
TABLE 1-3. PRIORITY OF EVENTS
Action When Processed
Function Title
Function Priority
As specified under the instruction
Forced Instruction Request (occurs
All three are first
definition.
whenever instructions 13 (k=1,3)
priority
or 17 (k=2) occur).
Program jump to address 00000
Program Fault Fast Interrupt
or 00540 depending upon auto-
(occurs from an illegal function
matic recovery switch setting.
code).
Increment the contents of address
Additive Real-time clock Update
00160 by one.
request (occurs once every cycle
of the additive real-time clock).
Stores the External Interrupt
External Interrupt (occurs when
Word at address 00520 plus chan-
an external device sets the Exter-
(Channel dependent)
nel number and sets the External
nal Interrupt Request line).
1/0 interrupt.
Performs an External Function
External Function (occurs when
Buffer using the buffer control
an external device sets the Exter-
(Channel dependent)
, word at address 00140 plus chan-
nal Function Request line).
nel number.
Performs an Output Buffer using
4-5*
Output Data Request (occurs when
the buffer control word at address
an external device sets the Output
(Channel dependent)
00120 plus channel number.
Data Request line).
5-4*
Performs an Input Buffer using the
Input Data Request
buffer control word at address
l Each time either 4 or 5 is de-
(Channel dependent)
00100 plus channel number.
tected they shall reverse their
priority.
Program jump to Intercomputer
Intercomputer time-out I/O
Time-Out entrance register at
Interrupt (occurs when the trans-
(Channel dependent)
address 00600 plus channel num-
mitting computer has held a word
ber.
in an output register for the time
specified without receiving an
Acknowledge).
Program jump to External Inter-
External 1/0 interrupt (occurs
rupt Entrance register at address
when an External Interrupt function
(Channel dependent)
00020 plus channel number.
priority 2, is processed).
Program jump to the External
External function monitor 1/0
Function Monitor Interrupt en-
interrupt (occurs when an External
(Channel dependent)
trance register at address 00500
Function buffer with monitor ter-
plus channel number.
minates).
Program jump to the Output Moni-
Output data monitor 1/0 interrupt
tor Interrupt entrance register at
(Channel dependent)
(occurs when an output data buffer
address 00060 plus channel num-
with monitor terminates).
ber.
333
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