SC14422 Complete Baseband Processor for DECT Base Stations
PRELIMINARY
March 1998
SC14422
Complete Baseband Processor for DECT Base Stations
General Description
Preliminary document version 1.1.
The SC14422 is a 3.0 Volt CMOS IC optimized to handle
all the audio, signal and data processing needed within a
DECT basestation. An ADPCM transcoder, a very low
power CODEC and Analog Frontend are integrated. Di-
rect connections towards analog or ISDN line interface.
The SC14422 is designed to be compatible with many
radio interfaces. A dedicated TDMA controller handles all
physical layer slot formats and radio control.
The integrated National Semiconductor鈥檚 standard
CR16A processor core with external Program memory
(Flash or ROM) takes care of all the higher protocol stack.
Programmable I/O ports can be configured as chip selects
for I/O expanders, Serial Flash memory, interrupt source
or I/O. A digital serial interface can be configured to inter-
face to many codecs and ISDN devices with
碌
-Law, a-Law,
linear or transparent data formats.
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2k + 4kbyte Data Memory.
Two full duplex 32 kbits/sec ADPCM transcoder.
14-bit linear CODEC with programmable gain
Serial interface to external codecs and ISDN interface
circuits.
Echo canceller, two echo suppressors, DTMF genera-
tor, sidetone and artificial echo loss.
On-chip gaussian Modulator.
Peak hold ADC for RSSI measurement
Three input 8 bit successive approximation ADC.
On board programmable Dedicated Instruction Proces-
sor (DIP) for all TDMA based events.
Protected and unprotected half, full and double slot B-
fields D00, D08, D32 and D80
Standard DECT encryption with different keys for
different MAC-connections.
6 MAC connections can be handled simultaneously.
Flexible three wire interface to radio front synthesizer.
Three general purpose I/O ports with programmable in-
terrupts.
General purpose full duplex UART.
SPI
TM
and MICROWIRE
TM
interfaces.
Two general purpose timers and watchdog timer.
Programmable chip selects to 8 bit wide ROM, SRAM
NAND Flash Memory and I/O expanders.
Capture timer for frequency measurement for e.g. me-
tering, ringing and call progress tone detection.
100 pin TQFP-100 package.
Features
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Integrated DECT base band transceiver optimized for
GAP base stations according to ETS 300 175-2, 175-3
& 175-8.
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3.0 to 5.5 Volt operating voltage.
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Embedded 16 bit CompactRISC
TM
CR16A Microproc-
essor with In System Emulation (ISE) mode.
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System Diagram
SC14401
SC14402
SC14422
ISDN or
PSTN
PSTN
Interface
ISDN
SC14401
SC14402
SC14402
4220030
SPI
TM
is a trademark of Motorola, MICROWIRE
TM
and CompactRISC
TM
are trademarks of National Semiconductor Corporation
Copyright 1998 National Semiconductor Corp.
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