RALCWI Vocoder
CMX608/CMX618/CMX638
STATUS register address $40
15
RDY
14
SVC
13
X
12
X
11
X
10
X
9
X
8
VDW
7
6
5
4
3
2
1
0
X
PLV
X
X
X
DFDA
EFDA
VDA
This read-only register indicates that the device has data or needs servicing. The device can be
used in an interrupt driven mode or a polled mode.
If being used in an interrupt driven mode, after a C-BUS interrupt, this register should be read to
establish the reason for the interrupt. An interrupt will only be generated if the corresponding bit of
the IRQENAB register ($1F) is also set to '1'. If the device is being used in a polled mode, then
this register should be read at regular intervals. The register is cleared to '0' after it is read. It is
possible for more than one bit to be set to '1', so each bit should be dealt with as appropriate. Bits
marked 'X' may get set during normal operation. These should be read and ignored.
Bit 0
VDA
Vocoder data available. When this bit is set to '1' a packet of encoded voice is
ready to be read from the ENCFRAME register ($30).
Bit 1
EFDA
Encoder Frame Data available. When this bit is set to '1', the encoder has
finished encoding a 20ms frame and has updated the EFRAMEDATA register
($38), so the host can determine if the frame contained voice, DTMF or a single
tone and obtain any associated data.
Bit 2
DFDA
Decoder Frame Data available. When this bit is set to '1', the decoder has
finished decoding a 20ms frame and has updated the DFRAMEDATA register
($37), so the host can determine if the frame contained voice, DTMF or a single
tone and obtain any associated data.
Bits 3 to 5
These bits have an un-defined state.
Bit 6
PLV
Peak Level sample for the last 20ms frame available. When this bit is set to '1', the
peak sample value for the last 20ms frame of encoded audio has been updated.
This value may be read from the PLEVEL ($31) register.
Bit 7
This bit has an un-defined state.
Bit 8
VDW
Vocoder Data Wanted. When this bit is set to '1' the device is ready to accept
another packet of data for decoding. Prior to entering decode mode, the high and
low watermarks should be programmed into VDWHLWM register ($1E) and the
Vocoder Data Wanted bit (DVDW) should be set to '1' in the VCTRL register
($11).
Bits 9 to 13
These bits have an un-defined state.
Bit 14
SVC
Service. When this bit is set to '1' it indicates that the device has completed a
service request and that the status of the request can be read from the SVCACK
($2E) register. This bit is also used to indicate that a write to the DTMFATTEN
($0A) register has completed. In this latter case, the SVCACK register need not be
read.
Bit 15
RDY
Ready. When this bit is set to '1' it indicates that the device is ready to accept
commands after certain time consuming operations. This bit will be set to '1' after
the following operations:
2012 CML Microsystems Plc
55
D/608_18_38/10
CMLMICRO [ CML MICROCIRCUITS ]
