Specifications

AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
IC Chi
p Software Errata
Allo
w the use of TXRQST signal for skew control, when the number of samples in a
frame is less than 160.
Call Progress tones work around based on rate.
Release 007 09/10/2009
Release 007 Improves the quality of single frequency tones and call progress tones for
AMBE-1000™ Vocoder Chip compatible rates.
In Release 007 the FEC error mitigation thresholds are set properly regardless of the
order the PKT_RATE(T/P) and PKT_INIT fields are sent. When an FEC rate is selected
via the rate configuration pins, the error mitigation thresholds are also set to the
appropriate value for the selected FEC.
In prior releases, PKT_INIT resets the FEC error mitigation thresholds to 0. Therefore,
after sending PKT_INIT it is always necessary to send PKT_RATET or PKT_RATEP to
set the error mitigation thresholds to the appropriate value for the selected FEC. For
prior releases, if FEC is used, it is necessary to send PKT_RATET or PKT_RATEP in
order for the FEC error mitigation thresholds to be set properly. In Release 007, it is not
necessary to send PKT_RATET or PKT_RATEP when FEC is used.
For Release 007, packet parity bytes can be disabled at reset using the parity enable pin.
Parity can also be disabled using a soft-reset packet (using a PKT_RESETSOFTCFG
field) to specify that parity should be disabled.
The parity enable pin can be used to disable parity bytes. This feature was not available
in Release 005.
(Subject to Change) Page 90
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