CMX608 datasheet(40/70 Pages) CMLMICRO

40 / 70 page

RALCWI Vocoder

CMX608/CMX618/CMX638

 2014 CML Microsystems Plc

D/608_18_38/11

6 - 15 Reserved.

Bits 5 and 4

Reserved

These bits should be cleared to '0' for correct device operation.

SEL1 / SEL0 = '10' - Command

Command

This sub-register is used for issuing commands to control the various aspects of the interaction of

the device and an external CODEC.

Bits 5-0

Command

This field specifies a command to execute. Bit 5 is the msb.

$00 Reserved.

$01 (ECC_SSP_START)

Starts the SSP. If the CODEC requires initialisation commands and these have been pre-loaded

through the EXCODECCMD register ($12), then these will be sent as soon as the CODEC starts

transferring data.

If the SSP is already running, then this command is ignored and a status value of '0' is returned.

$02 (ECC_SSP_STOP)

Stops the SSP. All activity on the SSP will be ignored.

If the SSP is not running, then this command is ignored and a status value of '0' is returned.

$03 (ECC_FIFO_CLEAR)

Clears the FIFO associated with the EXCODECCMD register ($12). The ECFIFO register ($24)

will also be cleared.

$04 (ECC_FIFO_COUNT)

Places the number of words contained in the FIFO into the ECFIFO register ($24). The ECFIFO

EXCODECCMD register ($12) (which pushes another value into the FIFO), so issuing this

command should be unnecessary.

$05 (ECC_FIFO_DATA)

Places all the words contained in the FIFO into the ENCFRAME register ($30). The ENCFRAME

sent first.

This command should not be issued whilst the device is actively encoding. The

controlling host should first read the ECFIFO register ($24), to get the number of words in the

FIFO. This value should be multiplied by 2 to get the number of bytes that have to be read from

ENCFRAME register ($30).

$06 (ECC_CODEC_RESET)

Places the CODEC in a reset state. The exact effect of this command is CODEC dependant. If

any of the generic CODEC settings are chosen, this command does not do anything. Please refer

to the external CODEC support section.

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