Digital Voice Systems AMBE-3000 Especificaciones Pagina 50

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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
I/
O Management
Figure 21 Codec Mode (McBSP Interface)
5.2.1 Timing of channel transmit packets in Codec Mode
When Skew Control is not used
The AMBE-3000™ vocoder chip outputs one packet per 20 ms. TX_RDY goes high once every 20 ms.
TX_RDY
Frame_Interval
(n)
Frame_Interval
(n+1)
Frame_Interval
(n+2)
Frame_Interval
(n+3)
20ms
“Packet_Uncertainty_Zone
Figure 22 TX_RDY with Skew Control Off
When Skew Control is used
The AMBE-3000™ vocoder chip outputs one packet per each TX_RQST 0 to 1 transition. TX_RDY goes high approximately
5.625 ms after TX_RQST 0 to 1 transition. TX_RDY goes high once every 20 ms.
(Subject to Change) Page 40
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