LG -P940 Service Manual page 41

3. TECHNICAL BRIEF
• Supports idle request/acknowledge protocol
• Buffers for transmit/receive operations
• DMA requests (one per direction) link with the 32-bit register
• Up to four transmit channels
• Four serializers implemented
• Support of disconnect protocol
Multichannel Buffered Serial Port
There are three McBSP instantiations: McBSP1 through McBSP3. They provide a full-duplex direct serial interface
between the ABE and external devices, such as other modems, BT chips, or codecs. Because of its versatility, a
McBSP can accommodate a wide range of peripherals and clocked frame-oriented protocols (I2S, PCM, TDM).
List of recommended usage per McBSP:
• MCBSP1: BT voice/audio data
• MCBSP2: Digital baseband (DBB) voice data
• MCBSP3: MIDI FM data
The McBSP has the following features:
• Interconnect slave interface (internal interconnect) supports:
– 32-bit data bus width
– 8-, 16-, and 32- bit access
– 10-bit address bus width
– Burst not supported
– WNP
• Buffers for transmit/receive operations: 128/128 32-bit words (McBSP1, 2, 3)
• Interrupts configurable in legacy mode (two requests) or PRCM-compliant (one request)
• DMA requests (one per direction) triggered with programmable FIFO thresholds
• Multidrop support
• Serial interface description
• Four-pin configuration (McBSP1, 2, 3)
• Full-duplex communication
• Multichannel selection modes
• Support to enable or block transfers in each channel
• Up to 128 channels for transmission and for reception
• Supported protocols
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