Hardware manual

EUROCOM-17-5xx 3 Programmers Reference
Hardware Manual 83
3.18.1 Local Interrupt
Sources
The EUROCOM-17-5xx has eight local interrupt sources connected to six
VIC inputs (LIRQ1, LIRQ3 to LIRQ7).
Table49: Local Interrupt Sources
The system CIO and user CIO interrupt can be programmed to LIRQ6 or
LIRQ4 independently. If programmed to LIRQ4, the VIC must be
programmed to supply the vector. For more information, see Section3.6
‘CIO Counter/Timers’. The default setting is shown in Table49: ‘Local
Interrupt Sources’.
The video controller interrupt can be programmed to LIRQ4 or can be
disabled.
1. Can be programmed to LIRQ4. In this case the VIC must supply the vector, and the
video controller interrupt is disabled.
2. These levels are not changeable (i.e. fixed in hardware), all other levels are
programmable via VIC register. Also all vectors delivered by the VIC are
programmable.
3. Can be disabled by software.
Device VIC Input Level Vector Supplied by
ILACC LIRQ7 3 $47 VIC
System CIO LIRQ6 5
1)
$xx CIO
User CIO LIRQ6 5
1)
$xx CIO
Serial I/O LIRQ6 5
2)
$xx CL-CD2401
LEB LIRQ5 2
2)
$xx IPIN
Video Controller (FRAMEIN) LIRQ4 4
3)
$44 VIC
SCSI Controller LIRQ3 2 $43 VIC
VIC Timer LIRQ2 6 $42 VIC
Keyboard Controller LIRQ1 1 $41 VIC
VIC ACFAIL - 7 $48 VIC
VIC Failed Write Post - 7 $49 VIC
VIC Arbitration Time-out - 7 $4A VIC
VIC SYSFAIL - 7 $4B VIC
VIC Interrupter IACK - 1 $4C VIC
VIC DMA - 1 $4D VIC
VIC ICMS0..ICMS3 - 5 $1C - $1F VIC
VIC ICGS0..ICGS3 - 7 $10 - $13 VIC