Programming 59
network
interrupts
are
pending,
examine
bits
07,
02,
01
and
00
in
the
LISR
register.
3.3.12 Interrupt 2 Sender Data FIFO
Interrupt
2
Sender
Data
FIFO
(ISD2)
BAR2
(Offset
$28):
A
32
‐
bit
FIFO
functioning
just
like
ISD1,
except
it
responds
only
to
type
2
network
interrupts.
3.3.13 Interrupt 2 Sender ID FIFO
Interrupt
2
Sender
ID
FIFO
(SID2)
BAR2
(Offset
$2C):
An
8
‐
bit
FIFO
functioning
just
like
SID1,
except
it
responds
only
to
type
2
network
interrupts.
3.3.14 Interrupt 3 Sender Data FIFO
Interrupt
3
Sender
Data
FIFO
(ISD3)
BAR2
(Offset
$30):
A
32
‐
bit
FIFO
functioning
just
like
ISD1,
except
it
responds
only
to
type
3
network
interrupts.
3.3.15 Interrupt 3 Sender ID FIFO
Interrupt
3
Sender
ID
FIFO
(SID3)
BAR2
(Offset
$34):
An
8
‐
bit
FIFO
functioning
just
like
SID1,
except
it
responds
only
to
type
3
network
interrupts.
3.3.16 Interrupt 4 Sender Data FIFO
Interrupt
4
Sender
Data
FIFO
(ISD4)
BAR2
(Offset
$38):
A
32
‐
bit
FIFO
functioning
just
like
ISD1,
except
it
responds
only
to
type
4
network
interrupts.
3.3.17 Interrupt 4 Sender ID FIFO
Interrupt
4
Sender
ID
FIFO
(SID4)
BAR2
(Offset
$3C):
An
8
‐
bit
FIFO
functioning
just
like
SID1,
except
it
responds
only
to
type
4
network
interrupts.