The addressable memory is divided into four ranges

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Unformatted text preview: 13.3 The OneCTM VWS22100 GSM chip The OneC VWS22100, developed by VLSI Technology, Inc., is a system-on-chip design for a GSM mobile telephone handset. With the addition of external program and data memory and a suitable radio module it provides all the functions required in a handset. An example of a GSM handset that uses the OneC VWS22100 integrated baseband device is the Samsung SGH2400, a dual-band (GSM 900/1800) handset with hands-free voice-activated dialling, shown in Figure 13.4 on page 353. VWS22100 organization The system architecture of the OneC VWS22100 is typical of a controller used in today's mobile phone handsets, incorporating an ARM7TDMI core as a general-purpose controller handling the user interface and certain GSM protocol layers and a DSP core to handle the baseband signal processing aided by some special-purpose signal processing hardware blocks. It is illustrated in Figure 13.5 on page 354. The DSP subsystem (shown in the shaded rectangle in Figure 13.5) is based around the 16-bit Oak DSP core. It performs all the real-time signal processing functions which include: voice coding; equalization; DSP subsystem The OneCTM VWS22100 GSM chip 353 Figure 13.4 Samsung's SGH2400 GSM handset uses the OneC VWS22100. channel coding; echo cancellation; noise suppression; voice recognition; data compression. ARM7TDMI subsystem The ARM7TDMI core is responsible for the system control functions which include: the user interface software; the GSM protocol stack; power management; driving the peripheral interfaces; running some data applications. Duty allocation The split of tasks between the ARM and Oak cores can be illustrated by examining some of the details in Figure 13.5. 354 Embedded ARM Applications Figure 13.5 OneC VWS22100 GSM chip organization. The audio and radio interfaces (on the left of the figure) are connected to both processing systems. The ARM system sets the gains of the amplifiers, controlling the radio transmission power level and the frequency synthesizers, causing the ringer to inform the user of an incom...
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