1. System Overview The MT6218B is a highly integrated single chip solution for GSM/GPRS phone. Based on 32 -bit ARM7EJ-STM RISC processor, MT6218B features not only high performance GPRS Class 12 MODEM but is also designed with support for the wireless multi-media applications, such as advanced display engine, hardware JPEG decoder, synthesis audio with 64-tone polyphony, digital audio playback, Java acceleration, MMS and etc. Additionally, MT6218B provides varieties of advanced interfaces for functionality extensions, like 8-port external memory interface, 3-port 8-bit parallel interface, NAND Flash, IrDA, USB and MMC/SD/MS/MS Pro. The typical application can be shown as Figure 1.