PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 103

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

4.1.4.1
The PI allows to program the IEC-Q 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
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 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 43. The relevant control and status
bits for transmission and reception are:
Table 16
Register
MOCR
MOSR
STAR
Table 17
Register
MOCR
MOSR
Semiconductor Group
®
-2-bus occur synchronized to frame sync FSC, the flow of data is controlled by a
Monitor Channel Protocol
Monitor Transmit Bits
Monitor Receive Bits
Bit
MRC
MRE
MDR
MER
Bit
MXC
MXE
MDA
MAB
MAC
control / status
control
status
control / status
control
status
103
Function
MX Bit Control
Transmit Interrupt Enable
Data Acknowledged
Data Abort
Transmission Active
Function
MR Bit Control
Receive Interrupt Enable
Data Received
End of Reception
Operational Description
Data Sheet 01.99
PEB 2091
PEF 2091