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. Direct 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’s 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 interface to many codecs and ISDN devices with m-Law, a-Law, linear or transparent data formats.

Features

■ Integrated DECT base band transceiver optimized for GAP base stations according to ETS 300 175-2, 175-3 & 175-8.

■ 3.0 to 5.5 Volt operating voltage.

■ Embedded 16 bit CompactRISCTM CR16A Microprocessor with In System Emulation (ISE) mode.

■ 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 generator, 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.

■ SPITM and MICROWIRETM 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. metering, ringing and call progress tone detection.

■ 100 pin TQFP-100 package.