CMX608 datasheet(56/70 Pages) CMLMICRO

56 / 70 page

RALCWI Vocoder

CMX608/CMX618/CMX638

 2014 CML Microsystems Plc

D/608_18_38/11

Read the SVCACK register ($2E) and check that bit 0 is set to '1', which indicates that the device

has accepted the control command. If this bit is not set to '1', it indicates that a control command

was sent before a valid configuration was sent.

Wait for encoded frames

Wait for a C-BUS interrupt, or poll the STATUS register ($40) until bit 0 is set to '1'.

Read 27 bytes from the ENCFRAME register ($30).

Repeat this step until no more encoded voice frames are required.

Go to step 8 or step 11.

Decoding:

Start decoder running (stop encoder if it was running)

Write $0001 into the VCTRL register ($11).

This tells the Vocoder to disable the encoder and stop collecting samples if previously encoding. It

will also enable the decoder.

Wait for control command to complete

Wait for a C-BUS interrupt, or poll the STATUS register ($40) until bit 15 is set to '1'.

Read the SVCACK register ($2E) and check that bit 0 is set to '1', which indicates that the device

has accepted the control command. If this bit is not set to '1', it indicates that a control command

was sent before a valid configuration was sent.

10. Supply frames for decoding

Write a 27 byte frame into the DECFRAME register ($10).

Wait for 60 milliseconds, and repeat.

Go to step 5 or step 11.

Powersaving:

11. Stop encoder and decoder

Write $0000 into the VCTRL register ($11).

12. Stop the clock

Pull the ENABXTAL pin (pin 34) to '0'.

(Note that additional power can be saved by powering down the BIAS pin. However, it is necessary

to wait for 100ms for the BIAS pin to reach its steady-state value of AVDD / 2 after the bias chain

has been powered-up again, which is done by setting POWERSAVE register ($09) bit 0 to '1').

Reactivation:

13. Start the clock

Pull the ENABXTAL pin (pin 34) to '1'.

14. Wait for device to be ready

The host must wait for at least 27ms before starting the encoder or decoder.

15. Start encoding or decoding

Jump to step 5 or step 8.

CMX608 数据表(PDF) 56 Page - CML Microcircuits

CMX608 数据表(HTML) 56 Page - CML Microcircuits

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