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(qiáng)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): 153/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 153
Host Interrupt Acknowledge Bit
Read
Address 50h
7
-
6
-
5
-
4
-
3
-
2
-
1
-
0
HIA
HIA ... Host Interrupt Acknowledge
When transfering a message to the ISAR mailbox, the final write access to the host interrupt
register will automatically set the HIA bit. The ISAR will reset HIA as soon as the ISAR is
capable to accept another message.
Mailbox I/O data
Write / Read
Address 4Ch
7
6
5
4
3
2
1
0
The mailbox contains configuration, status and control information in addition to the control
register MSB as well as transmit and receive data. The number of bytes in the mailbox is
indicated in the control register LSB.
Mailbox write address
Write / Read
Address 4Ch
7
6
5
4
3
2
1
0
This register indicates the current write address on the mailbox buffer.
Before any data is written to the mailbox , the write address must be reset to 0 by the host.
For any access to mailbox I/O data, the address pointer will be autoincremented and does not
need to be programmed. This is the recommended way for sequential, fast access to the
mailbox.
For random access, the host has to reprogram the write address pointer.
Mailbox read address
Write / Read
Address 48h
7
6
5
4
3
2
1
0
This register indicates the current read address on the mailbox buffer.
Before the mailbox contents of a message are read, the read address must be reset to 0 by
the host. For any access to mailbox I/O data, the address pointer will be autoincremented and
does not need to be programmed. This is the recommended way for sequential, fast access to
the mailbox.
For random access, the host has to reprogram the read address pointer.
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