A power management block is required in order to provide an overall low-power consumption
design. We have inserted two programmable processors: microcontrol unit (MCU) and digital
signal processor (DSP). We have shown both devices present; however their presence
depends on the actual target application, UE capability, and data rates supported. In fact, nothing
precludes the designer from inserting more devices as long as their cost, size, and power budgets
are obviously met. For legacy reasons the audio codec (VSELP, AMR, and so on) functions
have been inside the communication processor since terminals were originally voice centric. We
have decided to leave this functionality within this section, but different functionality partitioning
may be more desirable.
The application processor (AP) functional architecture is given in Fig. 9.19. The application
processor essentially makes use of the data pipes delivered from the communication processor.
496 CHAPTER NINE
RF
??? Power Control
??? Spectral Conversion
??? Band Select
Communications
Processor
Applications
Processor
Audio, Video,
Data I/O
??? RTOS
??? Audio Codecs
??? Protocol Stack
??? Layer-1 Signal Processing
??? Games
??? Music
??? Videos
??? OS/RTOS
??? Mobile TV
??? Applications
??? Speakers/Mic
??? Audio
??? Keypad
??? Touch Screen
??? Display
FIGURE 9.
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