| 摘要 |
PURPOSE: An interface apparatus of a decoder in mobile communication terminal is provided to store inputted data at an input buffer RAM by each channel, then store again the decoded data at an output buffer RAM by each channel, and thereafter output the data to a CPU, thereby capable of implementing the interface of the decoder effectively. CONSTITUTION: An input buffer RAM interface unit(1) controls data output from a demodulator to store an input buffer RAM by each channel according to the clocks from the demodulator. The input buffer RAM(2) divides its regions for storing data by an audio channel, a common channel and an additional channel and stores the data from the demodulator according to the control of the input buffer RAM interface unit(1). A first coding controller(3) outputs a control signal for producing the data of the audio and common channels among the data stored at the RAM(2) as the input data of the demodulator. A second coding controller(4) outputs a control signal for producing the data of the additional channel among the data stored at the RAM(2) as the input data of the demodulator. The demodulator(5) reads the data from the RAM(2) and decodes in parallel. An output buffer RAM(6) divides its regions for storing data by an audio channel, a common channel and an additional channel, and stores the data decoded from the demodulator to the region by the corresponding channel. A CRC(Cyclic Redundancy Check) unit(7) checks an error of the decoded data. An SER(Symbol Error Rate) unit(8) checks a symbol error of the decoded data. A CPU read register interface unit(9) reads the data stored to the RAM(6) and then outputs the data to a CPU according to the completion of the check of CRC unit(7) and SER unit(8). A main control unit(10) controls the whole operation of each construction block.
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