代行动电话处理器通讯需求电话处理器通讯需求.PDFVIP

Using Low-Power Dual-Port for Inter Processor Communication in the Next Generation Mobile Handsets 運用低功耗雙埠運用低功耗雙埠RAM 運運用低功耗雙埠用低功耗雙埠 滿足滿足下一下一世代行動世代行動電話電話處理器通訊需求處理器通訊需求 滿足滿足下一下一世世代行動代行動電話電話處理器通訊需求處理器通訊需求 Cypress 數據通訊部門資深應用工程師 Danny Tseng TI 無線應用小組技術應用工程師Lawrence Wong TI 無線終端事業部行動電話系統資深系統設計師以及系統暨軟體技術長Hung Vuong Executive Summary The convergence of mobile phones and other consumer-driven devices such as PDAs, MP3 players, digital still and video cameras is progressing rapidly as evidenced by recent introductions of phones like the Motorola ROKR and Palm Treo™. Consequently, the demand for processing power is increasing exponentially in these high- performance, low-power devices, and it becomes inevitable for mobile handset manufacturers to start adopting a dual processor architecture. In the case of a PDA or smart phone, the two processing elements are typically a baseband processor and an application processor. The two processors operate independently, performing specialized tasks in the mobile phone architecture. The baseband processor acts as an RF modem, while the application processor runs the operating system and handles other multimedia features. High level operating systems, such as Linux, Symbian™ and Windows® CE/Mobile, usually require a powerful application processor that also manages the audio, video, and other wireless features such as Wi-Fi® and Bluetooth®. In 2G and 2.5G, the two processors are interconnected by a traditional serial interface, either UART or SPI. These serial standards provide a low-bandwidth solution typically not exceeding 1Mbps in throughput; just enough for low data rate traffic. However, with the proliferation of 3G/3.5G networks, the multimedia rich content boosts the inter- processor communication bandwidth requirement significantly. As a result, the use of conventional