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): 34/164頁
文件大小: 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 34
3.1.2
Message Transfer from Host to ISAR
The procedure to write a message to the ISAR mailbox is shown in figure 16.
The mechanism to access the ISAR mailbox is the same for all messages, which are:
Configuration setup
Configuration request
Status request
Control commands
Control commands along with transmit data
WRITE MESSAGE TO
ISAR MAILBOX
Read HIA-bit
Mailbox access
permitted (HIA=0)
Write to
CTRL MSB
Write to CTRL LSB
(= number n of
parameters)
No
Yes
Write parameter to
mailbox
Another parameter
necessary (n>0)
Write host interrupt
status byte to
HIS-regsiter (adr. 50h)
No
Yes
Done
n := n - 1
Indicates the new message
in the mailbox to the ISAR
Reset write address
register to 0
Figure 16 Write message transfer
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