TRANSCEIVER 800 MHz MTP700 Portable Radio / Detailed Service Manual 4.2 - 21
External Host Memories
The RedCap2 Address bus is a 22-bit wide (0:21) and RedCap2 Data Bus is a 16-bit
wide (0:15).
RedCap2 uses two types of memories:
Flash Memory
The Flash memory is dedicated to the application software. This memory has a 16-bit
wide data bus. The Flash memory is 4 Mega x 16-bit (ie 64 MBits density). When
addressing the Flash memory location, the processor reads into its 16-bit wide data bus.
Apart from storing radio firmware, the Flash also stores the Radio CodePlug (Customer
related information) such as telephone numbers, addresses, etc.
SRAM Memory
This 512k x 16-bit Static RAM is used for Data storage.
Serial Peripheral Interface (SPI)
The RedCap2 uses the SPI protocol (Serial Peripheral Interface) to communicate with RF
IC's (WPIC, ODCT, ESCORT), GCAP3 IC and the display driver.
The protocol is built upon 4 lines [MOSI(Tx), MISO(Rx), CS, CLK)].
The RF IC's are connected to SPIA module, while GCAP3 and the display are connected
via SPIB module.
The Display Module, based on the display driver (i.e. Samsung KS0741) uses a serial
interface.
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