Specifications

AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
(Subject to Change) Page 97
DVSI CONFIDENTIAL PROPRIETARY
IC Chip Software Errata
Digital Voice Systems, Inc.
The Speech Compression Specialists
Digital Voice Systems, Inc.
The Speech Compression Specialists
10 IC Chip Software Errata
DVSI reserves the right to make modifications, enhancements, improvements and other changes to the AMBE-3000F™
Vocoder Chip at any time without notice. This errata section provides updated information on software developments as it
pertains to the release number and release date. To identify the software release number of the AMBE-3000F™ Vocoder Chip
refer to the PKT_VERSTRING field in Section Packet Fields.
Release 002 7/28/2008
Original AMBE-3000F release.
Release 003 9/28/2008
Modified the AMBE-3000F™ to set TXRDY low after a packet is transmitted, and then
set it high again if there is already another packet in the buffer awaiting transmission.
This prevents the AMBE-3000F™ from having multiple packets in it’s transmit buffer
when using the PPT interface and assures that the TXRDY pin is set.
Modified the PPT interface so that if an attempt to read from the PPT is made when the
AMBE-3000F™ Vocoder Chip does not have any data available, then the user will read
a fixed value (0x34). This should only happen if the user attempts to read from the PPT
when TXRDY is low.
To better meet the specifications of Texas Instruments AIC14 Codec the I
2
C interface
was modified to insert a delay between SCL and SDA transitions.
Added more control packet fields as described in the users manual: PKT_WRITEI2C,
PKT_SETCODECRESET, PKT_CLEARCODECRESET, PKT_DISCARDCODEC,
PKT_DELAYNUS, and PKT_DELAYNNS
Release 004 11/14/2008
Improved the performance of the FEC decoder when Golay codes are used.
Release 005 06/02/2009
Added RTSn signal to support flow control. Flow control allows for better throughput
when the AMBE-3000F™ is operated in packet mode.
Added PKT_RTSTHRESH and PKT_GAIN control packet fields. See sections in the
user’s manual.
As another form of flow control. If a packet to be transmitted will not fit in the transmit
buffer, then wait until it fits. The encoding or decoding of packets is stopped if the
transmit is not keeping up. Primarily needed if consecutive channel packets are passed
to the AMBE-3000F™ in packet mode.
Packets should only be sent to the AMBE-3000F™ when RTSn is low. If the AMBE-
3000F™ receives a packet that does not fit into the receive buffer, it discards the oldest
packet, and acts as if it had never received it.
Optimizations to increase speed and reduce power usage.