參數(shù)資料
型號: PSB21911
廠商: SIEMENS A G
元件分類: 數(shù)字傳輸電路
英文描述: ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
中文描述: DATACOM, ISDN ECHO CANCELLER
文件頁數(shù): 86/164頁
文件大?。?/td> 1401K
代理商: PSB21911
PSB 21911
PSF 21911
Access to IOM-2 Channels
Semiconductor Group
86
11.97
2.6.4.1
Monitor Channel Protocol
The PI allows to program the IEC-Q TE Monitor channel in the way known from the PEB
2070 ICC.
The Monitor channel operates on an asynchronousbasis. While data transfers on the
IOM-bus occur synchronized to frame sync FSC, the flow of data is controlled by a
handshake procedure using the Monitor Channel Receive (MR) and Monitor Channel
Transmit (MX) bits. For example: data is placed onto the Monitor channel and the MX bit
is activated. This data will be transmitted repeatedly once per 8-kHz frame until the
transfer is acknowledged via the MR bit.
The microprocessor may either enforce a "1" (idle) in MR, MX by setting the control bit
MOCR:MRC or MOCR:MXC to "0", or enable the control of these bits internally by the
IEC-Q TE according to the Monitor channel protocol. Thus, before a data exchange can
begin, the control bits MRC or MXC should be set to "1" by the microprocessor.
The Monitor channel protocol is illustrated in
figure 30
. The relevant control and status
bits for transmission and reception are:
Monitor Transmit Bits
Register
MOCR
Bit
MXC
MXE
MDA
MAB
MAC
control / status
control
Function
MX Bit Control
Transmit Interrupt Enable
Data Acknowledged
Data Abort
Transmission Active
MOSR
status
STAR
Monitor Receive Bits
Register
MOCR
Bit
MRC
MRE
MDR
MER
control / status
control
Function
MR Bit Control
Receive Interrupt Enable
Data Received
End of Reception
MOSR
status
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