pef20320 Infineon Technologies Corporation, pef20320 Datasheet - Page 140

• Manufacturer Part Number: pef20320
• Description: Multichannel Network Interface Controller For Hdlc With 32 Channels
• Manufacturer: Infineon Technologies Corporation

User’s Manual
4.2.2
The interrupt queue is specified as a kind of block (queue), starting on a start address
(programmable) with a defined length (programmable). Both, the start address and the
queue length are programmable in the Interrupt Queue Specification of the Control and
Configuration Section.
Figure 78
The minimum queue size is 16 long words; the maximum queue size is 4096 long words.
For each interrupt arising, the MUNICH32 writes the interrupt information into the
interrupt queue, will increment the pointer to the next address in this block automatically
and will generate an interrupt pulse at each interrupt occasion. It is up to the processor
to read the interrupt informations out of the interrupt queue. If the MUNICH32 arrives at
the end of the interrupt queue, it will jump to the start address of the interrupt block again
(cyclic queue) and completely overwrite the previous information.
Therefore the length of the interrupt queue should be calculated so, that the MUNICH32
will not overwrite information which was not yet read by the processor.
START ADDRESS
(Interrupt Queue
Address)
31
15
0
0
30
14
0
0
Interrupt Queue Specification
29
13
0
0
28
12
0
0
27
11
0
0
interrupt information long word (n+1)x16
interrupt information long word 1
interrupt information long word 2
26
10
interrupt information long word 3
0
0
Interrupt Queue Address
Interrupt Queue Address
25
0
9
0
24
0
8
0
140
.
.
.
23
overwrite
0
7
22
0
6
Detailed Register Description
21
0
5
20
0
4
length =
(n + 1)
where 0
n
19
0
3
18
16 long words
0
2
n
PEB 20320
255
17
0
1
01.2000
16
0
0