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): 38/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 38
3.1.4
Message Overview
The data path for the B-channel consists of FIFO buffer, SART, data pump and IOM-2 interface. Transmit/receive
data and configuration, status and control information is exchanged between the host and the ISAR by a set of
messages.
Buffer Configuration
Configuration setup
Host
ISAR
The host sets the priority at which each buffer's
request will be serviced by the host and the message
length at which data will be transfered between the
host and the mailbox.
Configuration request
Host
ISAR
The host can request the current configuration, i.e.
parameter settings such as base priority and message
length.
Configuration response
Host
ISAR
After a configuration request by the host, the ISAR will
respond with the current parameter settings.
Control commands
Host
ISAR
The host sends control commands to the ISAR
in order to clear or reset buffers.
Buffer Status
Status request
Host
ISAR
The host can request the current status of the buffers,
i.e. number of messages and free locations in the
buffers. Two different types of status responses can
be requested.
Status response
Host
ISAR
After a status request by the host, the ISAR will
respond with the current status information.
Status events
Host
ISAR
During data transfer the ISAR indicates to the
host, whether the buffer is able to store
another message, i.e. if new data can be
entered.
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