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Qualcomm MSM Chip-sets

Most HTC devices have at their core Qualcomm System-on-Chip (SoC) Mobile Station Modem (MSM) integrated circuits. These are based on Advanced RISC Machines Ltd. (ARM) micro-processor and supporting systems designs. In most Smart Phone devices the SoC consists of two ARM micro-processors, one to manage the communications hardware (radio transmitters) and the other to manage the user applications and interface. These are generally known as the modem (or radio or baseband ) processor and the applications (or apps ) processor. These processors may not be identical since their functions are different. Peripheral Communications The MSM SoC contains a large number of integrated controllers and peripherals, all of which need to communicate with one or all micro-processors. Data Mover Direct Memory Access (DMA) controllers set-up and supervise direct transfers of large blocks of data directly to or from a peripheral out of or into Random Access Memory (RAM). DMA releases th