CMX608 datasheet(42/70 Pages) CMLMICRO

42 / 70 page

RALCWI Vocoder

CMX608/CMX618/CMX638

 2014 CML Microsystems Plc

D/608_18_38/11

SVCREQ register address $0E

Service Request Value

This write only register sends special service requests to the device. Once the request has been

processed, bit 14 (SVC) of the STATUS ($40) register will be set to '1' and, if enabled, IRQN will

go low. The SVCACK ($2E) register will contain the status value, indicating whether the request

was successful. No other C-BUS registers should be read or written whilst this command is in

progress.

Bits 0 to 7

The 8-bit value written to this register specifies which operation to perform.

Currently, only 3 operations are defined. All other values are reserved:

$01

Request to load a Function Image

™. Please refer to section 6.7 for

further information.

$09

Request to turn on the PLEVEL functionality. Please refer to the

description of the PLEVEL ($31) register for further information.

$0A

Request to turn off the PLEVEL functionality.

FRAMETYPEW register address $0F

Frame 4

Frame 3

Frame 2

Frame 1

This write-only register contains the frame type for each of the 20ms raw Vocoder frames being

supplied for decoding. The fields in this register must be set before the packet that contains the

frames is written to the device.

The information in this register is used when the device is

configured to accept packets of raw Vocoder frames (without any FEC) and the DTX

(discontinuous transmission) option is enabled.

If the DTX option is disabled, the value in this register is unused.

The device can be set to decode 1, 2, 3 or 4 frames, representing 20ms, 40ms, 60ms or 80ms of

voice. For each frame, this register holds the corresponding 2-bit frame type attribute.

Bit 1/3/5/7

Bit 0/2/4/6

Frame Type

Data frame

reserved

SID frame

reserved

The device must be given full frames of data to decode. For a data frame, all of the bits are used.

For an SID frame, only the first 18 bits are used.

NOTE: The same number of bytes must be written to the DECFRAME register ($10), regardless of

frame type. This information indicates how much of it is significant.

DECFRAME register address $10

Decoder Frame

This write only register accepts packets of encoded speech data frames for decoding. This is a

byte wide streaming register that will take up to 144 bytes of data. The frequency and amount of

data to be written depends on how the device has been configured with the VCFG register ($07).

Bit 7 is the msb.

CMX608 Datasheet(PDF) 42 Page - CML Microcircuits

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