User`s manual

AMBE-3000™-HDK Development Board
User’s Manual Version 1.1
Page 39
DVSI Confidential Proprietary
Operation
A3kdirect Mode
A3kdirect Mode is used so that the AMBE-3000 HDK can connect the AMBE-3000™ Vocoder Chip’s
UART Interface to a PC across the RS-232 channel interface (P1). This physical link establishes a
communication connection where the PC can send any packets (speech, channel or control) directly to
the vocoder chip’s UART Interface and get either Compressed speech or PCM packets in return.
Additionally, the HDK can be set to receive PCM packets to be encoded and decoded and the sent
back as PCM data.
The data rate required for this interface may exceed the capability of some RS-232 hardware. DVSI
has tested this connection using the High Speed Serial Adapter USA-19HS manufactured by Keyspan.
The adapter will provide the user a high speed connection between the HDK’s serial port P1 to a USB
port on a USB equipped Windows PC.
To set the data rate use the switch settings for SW2 as shown in Table 22 AMBE-3000™ Vocoder Chip
UART Baud Rate Selection.
Note: For all modes other than A3kdirect Mode the SW2 switch settings for Positions 5, 6 and 7 should
be set for 460,800 baud.
Baud Rate (baud) Position 7 Position 6 Position 5
28,800 ON ON ON
57,600 ON ON OFF
115,200 ON OFF ON
230,400 ON OFF OFF
460,800 OFF ON ON
921,600 OFF ON OFF
Table 22 AMBE-3000™ Vocoder Chip UART Baud Rate Selection