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): 48/164頁
文件大小: 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 48
3.2.3
Buffer Configuration Response (ISAR
Host)
The ISAR provides the configuration data, which was requested by the host, via the mailbox. The
coding is similar to the configuration setup.
7
6
5
4
3
2
1
0
DPS
MSC
MDS
IIS
0
0
15
-
14
-
13
-
12
-
11
-
10
9
8
CTRL MSB
BBP
7
6
5
4
3
2
1
0
CTRL LSB
2
7
6
5
4
3
2
1
0
1. Parameter
MML
7
6
5
4
3
2
1
0
2. Parameter
MPL
DSP ... 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:
configuration response from datapath 0 (DPS=00)
1001:
configuration response from datapath 1 or 2 (DPS=01 or 10)
BBP ... Current Buffer Base Priority
000: not used
001: base priority of 1 (lowest priority)
: :
111: base priority of 7 (highest priority)
MML ... Currently Selected Maximum Message Length
MML contains the maximum message length that has been configured by the host.
If this value has not been programmed by the host, MML contains the reset value for the
maximum possible message length.
MPL ... Maximum Possible Message Length
MPL contains the maximum possible message length that can be configured.
MPL is 29 for data path 0 and 61 for data paths 1 and 2.
In receive direction the ISAR gathers all received data words from the SART up to the selected
message length, before the message is passed to the mailbox. Messages of reduced length may be
passed on certain events such like error conditions or HDLC frame end (see 3.5.1 SART Status
Events with Receive Data).
In transmit direction it's the responsibility of the host that transmit messages do not exceed the
selected message length, to avoid a buffer overflow and loss of data.
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