Panasonic EB-GD67 Service Manual

Also see for EB-GD67: Operating instructions

TECHNICAL DESCRIPTIONIssue 1 Section 4 MMCD020801C8Revision 0 – 10 – Service Manual4.4. Baseband Overview4.4.1 IntroductionThe Baseband circuits of the phone are required to perform the following functions:• Equalisation• Channel coding / decoding• Speech coding / decoding• Data Encryption• Layer 1, 2 and 3 software tasks• Man Machine interface (MMI)• System Interface• SIM Interface and Management• Audio and Tone Generation• Power supply and battery management• RF power control• Synchronisation• Real time clockFigure 4.3: Baseband Block DiagramThe GD67 Baseband is built around a GSM chipset developed by Texas Instruments. The chipset comprises two chips,CALYPSO and IOTA. The highly integrated nature of the chips means that each contain a large number of functions.CALYPSO is a signal processing device with DSP and CPU. The DSP performs channel and speech encoder/decoder tasks,together with equalisation and encryption. The CPU runs layer 1, 2, and 3 software, controls the MMI, SIM and systeminterfaces, real time clock, and battery and power management. CALYPSO also controls IOTA.IOTA provides frame timing, A/D conversion, RF power control, audio interfacing including tone generation, and basebandpower supplies.FLASH+SRAMU640LCDKEYPADVIBRATEMOTORSIM CARDU600CALYPSOU620IOTADISCRETEACCESSORYINTERFACEI/OCONNECTOR BATTERYRFI/FPERSONALHANDSFREESPEAKERMICI AND Q LINESPOWER RAMP SIGNALRF DIGITAL CONTROL LINESBASEBAND INTERFACEVOICEBAND INTERFACEMCU INTERFACESIM INTERFACEAFC10566-1RTC(32 kHz)BACK-LIGHTS+ T -MELODYGENERATORCS0, CS1CS3uWIRE I/FINT1,INT2U751U750