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6.1. THE BASE-BAND SECTION
6.1.1. INTRODUCTION (SEE Fig. 17)
The base-band section consists of a base-band integrated circuit (BBIC), a Flash PROM and an
EEPROM.
6.1.2. THE BASE-BAND INTEGRATED CIRCUIT (BBIC)
The CICB00001367 (PMB5737 : IC6) is a CMOS device designed to handle all the audio, signal
and data processing needed in a DECT base unit. It contains a "burst mode controller" which
takes care of DECT specific physical layer and radio section control. It also contains an ADPCM
codec filter used for speech encoding and decoding in the DSP section, a general purpose
microcontroller, various other ADC's, DAC's, timers and power control circuitry.
The BBIC interfaces to its external PROM (IC5) via a data/address/control bus. It connects to the
EEPROM (IC9) via a serial interface, and a second serial interface is used during manufacture
and service to connect to an external computer.
6.1.3. FLASH PROM (SEE Fig. 18)
The 2 Mbit (IC5) Flash PROM contains the operational firmware for the microcontroller. It is
interfaced to the data/address/control bus using address lines A0 to A17, data lines D0 to D7,
and chip select (pin 30), output enable (pin 32), and write (pin 7).
6.1.4. EEPROM (SEE Fig. 18)
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