Altera Embedded Peripherals IP - Manual (Page 279)

Table 28-8: The VIC_CONFIG Register Map
Bits Field Name Access Reset
Value
Description
0:2
VEC_SIZE
R/W 0 The vector size field.
VEC_SIZE
specifies the number of bytes
in each vector table entry.
VEC_SIZE
is encoded as log2
(number of words) - 2. Namely:
0—4 bytes per vector table entry
1—8 bytes per vector table entry
2—16 bytes per vector table entry
3—32 bytes per vector table entry
4—64 bytes per vector table entry
5—128 bytes per vector table entry
6—256 bytes per vector table entry
7—512 bytes per vector table entry
3
DC
R/W 0 The daisy chain field.
DC
serves the following purposes:
Enables and disables the daisy chain input interface, if present.
Write a 1 to enable the daisy chain interface; write a 0 to
disable it.
Detects the presence of the daisy chain input interface. To
detect, write a 1 to
DC
and then read
DC
. A return value of 1
means the daisy chain interface is present; 0 means the daisy
chain interface is not present.
4:31 Reserved
Table 28-9: The VIC_STATUS Register Map
Bits Field Name Access Reset
Value
Description
0:5
HI_PRI_IRQ
R 0 The highest priority interrupt field.
HI_PRI_IRQ
contains the
IRQ number of the active interrupt with the highest RIL.
When there is no active interrupt (
IP
is 0), reading from this
field returns 0.
When the daisy chain input is enabled and it is the highest
priority interrupt, then the value read from this field is 32.
Bit 5 always reads back 0 when the daisy chain input is not
present.
6:3
0
Reserved
31
IP
R 0 The interrupt pending field.
IP
indicates when there is an
interrupt ready to be serviced. A 1 indicates an interrupt is
pending; a 0 indicates no interrupt is pending.
28-10 Register Maps
UG-01085
2014.24.07
Altera Corporation Vectored Interrupt Controller Core
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