PEB4266T-V1.2 Datasheet, PDF (68/374 Pages) Infineon Technologies AG – Dual Channel Subscriber Line Interface Concept

DuSLIC
Functional Description
The glow lamp circuit also requires a resistor (R_MW) and a lamp (MW Lamp) built into the
phone. When activated, the lamp must be able to either blink or remain on constantly.
In non-DuSLIC-E/-E2/-P solutions, the telephone ringer may respond briefly if the signal
slope is too steep; behavior that is not desirable. The integrated ramp generator of the
DuSLIC-E/-E2/-P can be programmed to increase the voltage slowly, to ensure that the
lamp is activated and not the ringer.
To activate the Message Waiting function of DuSLIC-E/-E2/-P, the following steps
should be performed:
1. Activating Ring Pause mode by setting the M0-M2 bits
2. Select Ring Offset RO2 by setting the bits in register LMCR3
3. Enable the ramp generator by setting bit RAMP-EN in register LMCR2
4. Switch between the Ring Offsets RO3 and RO2 in register LMCR3 to flash the lamp
on and off (see Figure 34).
The values for RO2 and RO3 must first be programmed in the CRAM to the appropriate
values so that the lamp will flash on and off.
V_TR
V_HIGH
Lamp On
RO 3
V_LOW
Power Down
State
Ring Pause
State
Lamp Off
RO 2
t
RNG-OFFSET Bits
11
10
Figure 34 Timing Diagram
t
ezm14067
2.10
Three-party Conferencing in DuSLIC-E/-E2/-P
Each DuSLIC-E/-E2/-P channel has a three-party conferencing facility implemented
which consist of four PCM registers, adders and gain stages in the microprogram and
the corresponding control registers (see Figure 35). Cascading DuSLIC-E/-E2/-P
channels allows Multi-party Conferencing as well.
Preliminary Data Sheet
68
DS3, 2003-07-11