PSB7115 Datasheet, PDF (89/264 Pages) Siemens Semiconductor Group – Enhanced ISDN Data Access Controller ISAR 34

PSB 7115
Operational Description
3.3.3
Buffer Status Event (ISAR 34 → Host)
There are two message types for status events from the buffer:
• Status event that is related to a certain buffer (see chapter 3.3.3.1)
• Indication for buffer available - general code for all buffers (see chapter 3.3.3.2)
3.3.3.1
:
IIS
Buffer Specific Status Event (ISAR 34 → Host)
7
6
5
4
3
2
DPS
MSC
1
0
MDS
CTRL MSB
15
14
13
12
11
10
9
8
STEV
CTRL LSB
7
6
5
4
3
2
1
0
0
DPS …
MSC …
MDS …
STEV …
Datapath selection
00:
path 0
01:
path 1
10:
path 2
11:
path 3
Message coding
The message coding is different for datapath 0 and datapath 1, 2, 3.
1111: status event from datapath 0 (DPS = 00)
1010: status event from datapath 1, 2 or 3 (DPS = 01, 10 or 11)
Message destination/source
The source coding is different for datapath 0 and datapath 1, 2, 3.
10:
message is originated from the buffer (for DPS = 00)
00:
message is originated from the buffer (for DPS = 01, 10 or 11)
Status Event Code
1Fh:
Transmit Buffer Overflow
2Fh:
Receive Buffer Overflow
Semiconductor Group
89
02.98