Motorola LA-5137 Руководство по интеграции - Страница 14
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3-2 LA-5137 Compact Flash Adapter Integration Guide
3.3 Microprocessor Control
The baseband and MAC chip contains an ARM946E processor core and the SRAM required for implementing
the Media Access Control (MAC) functionality. The embedded firmware runs the 802.11 MAC layer control.
The MAC control sends and receives packets and transfers data to and from the CF interface to the host
computer of the handheld device.
3.4 Frequency Generation
The MAC & Baseband chip has the voltage-controlled oscillator (VCO) required for the design. The VCO
operates in one of the two ranges: 9648 to 9936 MHz (4X channel frequency for low-band) or 9900 to 11,800
MHz (2X channel frequency for high band). The Synthesizer circuit uses the 40 MHz crystal oscillator to phase
lock the VCO to produce accurate channel frequency for the radio. The frequency range in the low-band is
covered in two MHz steps (1 MHz at the channel frequency) and in the high-band the LO frequency is covered
in five MHz steps (2.5 MHz at the channel frequency).