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): 26/164頁
文件大小: 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 26
Receive direction
For data transfer from the ISAR to the host, the following protocol at the host should be used. Additionally the
internal procedure at the ISAR is shown as well.
ISAR
HOST
*
read IIA-bit,
wait until IIA=0 (indicates that the host can
receive another message)
write to ISAR control word and
to mailbox
write command to IIS-register,
that causes setting of IIA-bit and INT-line
polling for IIA=0 (see first entry)
*
*
*
*
receives interrupt request from INT-line or poll
STA bit periodically
read IIS-register, ISAR control word
reset mailbox write address to 0 (only if data is
read from the mailbox)
read mailbox contents
write IIA=0 (indicates that the host has read all
mailbox registers, i.e. the ISAR may start a new
data transfer)
*
*
IIS
IIA
ISAR Interrupt Status
ISAR Interrupt Acknowledge
In receive direction, an interrupt is generated by the ISAR if enabled (MSK=1) or the host can poll the interrupt status
in the STA bit if the interrupt is masked (MSK=0). The host reads the ISAR Interrupt Status register (IIS) and the
ISAR control word as well as the mailbox if necessary. After data processing is completed, the mailbox is released by
the host when resetting the Interrupt Acknowledge Bit (IIA).
The most significant byte of the ISAR control word is used to transfer additional control, configuration or status data.
The least significant byte is used to indicate the number of valid bytes in the mailbox.
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