Digital Voice Systems AMBE-3000 Especificações descarregar pdf (Página 55)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

O Management

Figure 29 Packet Mode

Received packets are placed into a queue and response packets are generated in the order that the packets were received. If the

AMBE-3000F™ Vocoder Chip stops receiving packets, then it will stop sending packets after responding to the final packet

received.

5.4 Switching between codec mode and packet mode using packets

Upon boot up or after a reset the AMBE-3000F™ Vocoder Chip is set to the mode (either codec mode or packet mode)

corresponding to the interface configuration pins (see Table 9 Physical Interface Selection). Switching the AMBE-3000F™

Voc

oder Chip from packet mode into codec mode or from codec mode into packet mode can be done through software using

configuration packets. The user can switch the AMBE-3000F™ Vocoder Chip between modes at any time using control

packets. (See Section Data and Configuration Packets)

To s

witch the AMBE-3000F™ Vocoder Chip from packet mode into codec mode using packets, a control packet with the field

identifier of 0x2A “PKT_STARTCODEC” (See Section Data and Configuration Packets) must be sent to the AMBE-30000™

coder Chip. The data byte in the PKT_START CODEC packet selects either SPI or McBSP for the codec interface. When

the AMBE-3000F™ Vocoder Chip is in codec mode it outputs channel packets automatically, once every 20 ms. It also

expects to receive a channel packet once every 20 ms. All timing is relative to the codec clock

To switch the AMBE-3000F™ Vocoder Chip from codec mode into packet mode using packets, a control packet with the field

identifier of 0x2B “PKT_CODECSTOP” (See Table 59 PKT_CODECSTOP Field) must be sent to the AMBE-30000™

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Digital Voice Systems AMBE-3000 Especificações Página 55