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CMX608 Datenblatt(PDF) 43 Page - CML Microcircuits |
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CMX608 Datenblatt(HTML) 43 Page - CML Microcircuits |
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43 / 70 page ![]() RALCWI Vocoder CMX608/CMX618/CMX638 2014 CML Microsystems Plc 43 D/608_18_38/11 When running the Vocoder in full-duplex mode (CMX638 only), the last bit of the data to be decoded should be clocked into the device no later than 6ms after the VDA bit is set and (if enabled) the corresponding IRQN is generated. This will ensure that the decoding and encoding operations are scheduled correctly. Note that a C-BUS clock of at least 200kHz will be required in streaming mode for transferring 80ms samples of soft decision encoded data. A higher C-BUS clock speed is required if the data transfer is done a byte at a time. The following table shows the frequency and packet size that needs to be written against the configuration setting: VCFG Register Description of packet DECFRAME 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 1 1 0 1 1 1 2400bps 3x20ms frames with FEC / Hard bits 27 60ms x x 1 1 1 0 1 1 2750bps 3x20ms frames with FEC / Hard bits 27 60ms x x 1 1 0 1 0 0 2400bps 4x20ms frames with FEC / Hard bits 36 80ms x x 1 1 1 0 0 0 2750bps 4x20ms frames with FEC / Hard bits 36 80ms x x 0 1 0 1 1 1 2400bps 3x20ms frames with FEC / Soft bits 108 60ms x x 0 1 1 0 1 1 2750bps 3x20ms frames with FEC / Soft bits 108 60ms x x 0 1 0 1 0 0 2400bps 4x20ms frames with FEC / Soft bits 144 80ms x x 0 1 1 0 0 0 2750bps 4x20ms frames with FEC / Soft bits 144 80ms Table 6 Decoder Packet Description This register is also used for loading blocks of Function Image ™ data. Refer to section 6.7 for further details. |
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