參數(shù)資料
型號: PSB7110
廠商: SIEMENS AG
英文描述: Enhanced ISDN Data Access Controller ISAR
中文描述: 增強綜合業(yè)務(wù)數(shù)字網(wǎng)的數(shù)據(jù)接入控制器專家組
文件頁數(shù): 52/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 52
3.3.2
Buffer Status Response (ISAR
Host)
The ISAR returns status information about the buffers if requested by the host (see 3.2.1).
7
6
5
4
3
2
1
0
DPS
MSC
MDS
IIS
15
-
14
-
13
-
12
-
11
10
9
8
CTRL MSB
RDM3
RDM2
RDM1
RDM0
7
6
5
4
3
2
1
0
CTRL LSB
6
7
6
5
4
3
2
1
0
1. Parameter
NBRL
7
6
5
4
3
2
1
0
2. Parameter
NBRM
7
6
5
4
3
2
1
0
3. Parameter
NMR
7
6
5
4
3
2
1
0
4. Parameter
NBTL
7
6
5
4
3
2
1
0
5. Parameter
NBTM
7
6
5
4
3
2
1
0
6. Parameter
NMT
DPS ... Datapath selection
00:
01:
10:
path 0
path 1
path 2
MSC ... Message coding
The message coding is different for datapath 0 and datapath 1, 2.
1111:
status response from datapath 0 (DPS=00)
1011:
status response from datapath 1 or 2 (DPS=01 or 10)
MDS ... Message destination/source
The source coding is different for datapath 0 and datapath 1, 2.
01:
message is originated from the buffer (for DPS=00)
00:
message is originated from the buffer (for DPS=01 or 10)
RDM3, RDM2, RDM1, RDM0 ... Request for next Data Message from Channel 3, 2, 1 or 0
If RDM0, RDM1 or RDM2 is set, the corresponding channel 0, 1 or 2 requests for a new data
message from the host, i.e. there is enough free buffer space for another message.
RDM3 is always set to "1". It is currently not supported but reserved for further use.
NBRL ... Number of free bytes in the receive buffer - LSB
NBRM ... Number of free bytes in the receive buffer - MSB
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