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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SM5907AF датащи(PDF) 20 Page - Nippon Precision Circuits Inc |
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SM5907AF датащи(HTML) 20 Page - Nippon Precision Circuits Inc |
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20 / 30 page  NIPPON PRECISION CIRCUITS-20 SM5907AF Shock-proof mode is the mode that realizes shock- proof operation using external DRAM. Shock-proof mode is invoked by setting MSON=H in microcon- troller command 80H. This mode comprises the following 3 sequences. Shock-proof operation overview - Encode sequence 1. Input data from a signal processor IC is stored in internal buffers. 2. Encoder starts after a fixed number of data have been received. 3. The encoder, after the most suitable predicting filter type and quantization steps have been deter- mined, performs ADPCM encoding and then writes to external DRAM. - Decode sequence 1. Reads compressed data stored in external buffer RAM at rate fs. 2. Decoder starts, using the predicting filter type and quantization levels used when encoded. 3. Outputs the result. - Compare-connect sequence 1. Encoding immediately stops when either external buffer RAM overflows or when a CD read error occurs due to shock vibrations. 2. Then, using microcontroller command 80H, the compare-connect start command is executed and compare-connect sequence starts. 3. Compares data re-read from the CD with the pro- cessed final valid data stored in RAM (confirms its correctness). 4. As soon as the comparison detects conforming data, compare-connect sequence stops and encode sequence re-starts, connecting the data directly behind previous valid data. |
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