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): 46/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 46
3.2
Buffer Configuration
3.2.1
Buffer Configuration Setup (Host
ISAR)
7
6
5
4
3
2
1
0
DPS
MSC
MDS
HIS
0
0
15
0
14
0
13
0
12
0
11
0
10
9
8
CTRL MSB
BBP
7
6
5
4
3
2
1
0
CTRL LSB
1
7
6
5
4
3
2
1
0
1. Parameter
MML
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:
configuration setup for data path 0 (DPS=00)
1001:
configuration setup for data path 1 or 2 (DPS=01 or 10)
BBP ... Buffer Base Priority
000:
001:
: :
111:
change base priority to 7 (highest priority)
priority is not changed by the configuration command
change base priority to 1 (lowest priority)
Reset value:
BBP = 4 datapaths 1 and 2 (DPS = 01, 10)
BBP = 5 datapath 0 (DPS = 00)
MML ... Maximum Message Length
The maximum message length is limited to 61 byte.
The buffer priority determines the sequence of service if more than one read buffer request for
mailbox service at the same time. In such a case the buffer with highest priority is served first and the
priority of all pending buffers is increased by one. After being served, the priority of the serviced
buffer is reset to its base value, which is selected by the above given configuration command.
So a buffer with a higher base priority will be served more often than a buffer with a lower base
priority, moreover, the higher the difference of two priority values the more often the one buffer will be
serviced first.
If the additional value (maximum message length) is omitted (CTRL LSB = 0), only the base priority
is changed. In this way the buffer base priority can be reconfigured to a different value during normal
operation without any loss of data consistency.
By changing the base priority, the current priority is reset to the new base value.
For highest throughput and best internal performance it is recommended to use the highest value for
MML.
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