PEB 2091
PEF 2091
Overview
1.5.2
PCM 4 with FAX/Modem Features
a/b
COT or TE
Mode
a/b
®
U
IEC-Q
PEB/F 2091
SICOFI -4 µC
IOM®-2
Interface
PEB 2466
a/b
a/b
ADPCM
ISAR
PEB 7274
PSB 7110
Serial
Interface
µP
Parallel Interface
Figure 5
1.5.3
PCM 4 Application
Repeater
The IEC-Q offers several special features to allow simple and cost effective design of
repeaters. Beside the microprocessor interface, free programming of maintenance bits
and special state machines for activation and deactivation control, the following three
features are of interest
• A wake-up tone from downstream is indicated directly on DOUT. No special circuit for
wake tone detection is needed. See "Upstream Wake-Up Indication in the LT
Repeater Mode", page 143.
• A master clock is delivered on pin CLS in the NT Repeater mode. This allows reducing
power consumption to a minimum in power down. Furthermore, PLL architecture can
be simplified. See "Clocks", page 45.
• The undervoltage detection function can be used to detect power supply level drops
on the board and reduce external reset circuitry. Refer to "Undervoltage Detection",
page 92.
Semiconductor Group
24
Data Sheet 01.99
INFINEON [ Infineon ]
