Digital Voice Systems AMBE-3000 Specifications download pdf (Page 46)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

O Management

(MSB)

Reserved.15 Reserved 0 at reset.

Table 13 ECMODE_IN Flags

ECMODE_IN is initialized at reset as determined by various configuration pins. It is also possible to directly specify the value

for ECMODE_IN by sending a PKT_ECMODE field within a configuration control packet prior to starting up the codec

interface or running the encoder. In addition, it is possible to specify ECMODE_IN every 20 ms by passing the value in every

packet (or selected packets). Note that ECMODE_IN will retain its value until it is changed.

The encoder produces channel data for every 20 ms frame. The I/O handler places the channel data into an outgoing channel

packet. The encoder also outputs a 16-bit status word named ECMODE_OUT, for each 20 ms frame. The ECMODE_OUT

flags are as specified in the following Table 14 ECMODE_OUT FLAGS

te: ECMODE_IN will retain its value until it is changed.

Bit

Number

Bit Name Bit description

0 Reserved.0 Reserved

1 VOICE_ACTIVE

If DTX is enabled, via the DTX_ENABLE bit of ECMODE_IN, then the

encoder sets VOICE_ACTIVE=1 if the channel data for that frame must be

transmitted. For frames which do not need to be transmitted, the encoder sets

VOICE_ACTIVE=0. Note that when VOICE_ACTIVE=0, the encoder still

produces a frame of channel data which may be transmitted if desired.

2-14 Reserved.2-Reserved.14

15 TONE_FRAME

The encoder sets this bit if the output frame contains either a single frequency

tone, a DTMF tone, a KNOX tone, or a call progress tone.

Table 14 ECMODE_OUT FLAGS

By default, the ECMODE_OUT flags are not output within the channel packets. If access to the flags is needed, it is possible

to configure the AMBE-3000F™ Vocoder Chip so that it will output the ECMODE_OUT flags in every channel packet that is

output or only when the ECMODE_OUT flags change. The PKT_CHANFMT field within a configuration control packet is

used to specify when/if the ECMODE_OUT flags are output.

For each 20 ms frame, the I/O handler also passes a 16-bit control word named DCMODE_IN to the decoder. DCMODE_IN

is used to control various decoder features. Each bit of DCMODE_IN is summarized in Table 15 DCMODE_IN Flags.

DCMODE_IN

is initialized at reset as determined by various configuration pins. It is also possible to directly specify the value

for DCMODE_IN by sending a PKT_DCMODE field within a configuration control packet prior to starting up the codec

interface or running the decoder. In addition, it is possible to specify DCMODE_IN every 20 ms by passing the value in every

packet (or selected packets). Features set by DCMODE_IN will override the state as set by the corresponding hardware

configuration pins.

Note: DCMODE_IN will retain its value until it is changed.

Bit

Number

Bit Name Bit Description Initial Value

0 Reserved.0

1 Reserved.1

2 LOST_FRAME

Frame repeat enable. If LOST_FRAME=1, then the

Decoder ignores any channel data provided to it and

performs a frame repeat.

0 at reset.

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