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CMX608 Datasheet(PDF) 45 Page - CML Microcircuits |
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CMX608 Datasheet(HTML) 45 Page - CML Microcircuits |
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45 / 70 page  RALCWI Vocoder CMX608/CMX618/CMX638 2014 CML Microsystems Plc 45 D/608_18_38/11 ENCFRAME register address $30 7 6 5 4 3 2 1 0 Encoded Frame This read only register contains the encoded speech data frames. This is a byte wide streaming register containing up to 36 bytes of data. The amount of data to be read depends on how the device has been configured with the VCFG register ($07). Bit 7 is the msb. This register should be read whenever the VDA bit is set in the status register. This indicates that a frame of vocoded speech is now available. Whilst it is not necessary to read this data out immediately, it must be read before another frame of vocoded speech is produced. The frequency of frames is also dependant on the configuration. The following table shows the amount of data that needs to be read, and the frequency of production against the configuration setting: VCFG Register Description of packet ENCFRAME 7 6 5 4 3 2 1 0 Byte Count Prod. every x x x 0 0 1 0 1 2400bps 1x20ms frame 6 20ms x x x 0 0 1 1 0 2400bps 2x20ms frames 12 40ms x x x 0 0 1 1 1 2400bps 3x20ms frames 18 60ms x x x 0 0 1 0 0 2400bps 4x20ms frames 24 80ms x x x 0 1 0 0 1 2750bps 1x20ms frame 7 20ms x x x 0 1 0 1 0 2750bps 2x20ms frames 14 40ms x x x 0 1 0 1 1 2750bps 3x20ms frames 21 60ms x x x 0 1 0 0 0 2750bps 4x20ms frames 28 80ms x x x 1 0 1 1 1 2400bps 3x20ms frames with FEC 27 60ms x x x 1 1 0 1 1 2750bps 3x20ms frames with FEC 27 60ms x x x 1 0 1 0 0 2400bps 4x20ms frames with FEC 36 80ms x x x 1 1 0 0 0 2750bps 4x20ms frames with FEC 36 80ms Table 7 Encoder Packet Description This register is also used to read the contents of the external CODEC command FIFO. The CODEC command FIFO is a word (16-bit) FIFO, so the data is presented as two bytes per word: the first byte being the most significant byte of the word. Please refer to the EXCODECCONT register ($0B) for more information. |
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