psf21911 ETC-unknow, psf21911 Datasheet - Page 86

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Semiconductor Group
2.6.4.1
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 asynchronous basis. 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
MOSR
STAR
Monitor Receive Bits
Register
MOCR
MOSR
Monitor Channel Protocol
MDA
MDR
Bit
MXC
MXE
MAB
MAC
Bit
MRC
MRE
MER
control / status
status
control / status
status
control
control
86
Data Acknowledged
Function
MX Bit Control
Transmit Interrupt Enable
Data Abort
Transmission Active
Function
MR Bit Control
Receive Interrupt Enable
Data Received
End of Reception
Access to IOM-2 Channels
PSB 21911
PSF 21911
11.97