Panasonic KX-FC971CX-S Service Manual page 93

KX-FC971CX-S / KX-FGA521CX-S
7.7.6.1. Digital Block Diagram
Digital board is incruding 2 systems. One is the BBIC system, BBIC controls CDL (FHSS) and all analog signals (Telephone,
CID and TAM) excepting Fax communications. Another one is Z80 ASIC system for mechanical functions: Copy, Fax and UI
(LCD/Key). And serial interface (UART) connects both systems.
Each system includes own Flash Memory for software program. Flash memory IC23 in the BBIC system is for both software and
voice data of TAM functions (message REC/PLAY, voice prompt). EEPROM IC22 in the BBIC sysytem is for software
parameter for CDL, Telephone and TAM functions.
Flash memory IC16 in the ASIC system is for software and also for user memory (settings, Phone book, CID memory) DRAM
IC17 in the ASIC system is for work memory and also for fax memory.
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