Panasonic EB-GD90 Technical Manual

Also see for EB-GD90: Operating instructions

Contents

http://cxema.ruGEMINIMCUK981201G8 Section 7 Issue ATechnical Guide – 31 – Revision 07 GEMINI7.1 IntroductionGemini contains the DSP, CPU and GSM timing functions and many peripheral functions. The software for the DSP iscontained in masked ROM.7.2 Functional DescriptionFigure 7.1: GEMINI Block Diagram7.2.1 Digital Signal ProcessorThe Digital Signal Processor (DSP) core is compatible with the Texas Instruments TMS350C5xx family of DSPs. Included inthe DSP core is an interface to the CPU by a shared memory interface.The DSP memory is also located within GEMINI. The ROM code size is determined by the size of the software.7.2.2 CPUThe CPU is an ARM7 32 bit RISC CPU with 16 bit instruction set. The CPU is designed to access 32 bit memory andperipherals; a further module within the GEMINI chip allows access to 8 or 16 bit memory.For 120 ns access FLASH and RAM a 13 MHz clock gives 1 wait state access to both devices.Memory Access TimesClock Speed Memory Access Time Additional Access time per wait state19.5 MHz 41 ns 51 ns13 MHz 67 ns 77 ns9.75 MHz 91 ns 102 ns6.5 MHz 144 ns 154 ns4.875 MHz 194 ns 204 ns3.75 MHz 298 ns 308 nsGSMTDMATIMERTPU DSPCORESIMI/FJTAGDSP ROMDSP RAMIRQ MEMI/FSERIAL I/FI/OPWMUARTARMINTERFACE TIMERSSPEECHINTERFACEBASEBANDINTERFACE10087-1