Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 18)

FAA20 Embedded NEXCOM Vocoder

Board Manual

This manual has been prepared for the Federal Aviation Administration.

FA100-00107 (March 2004) – Rev 1.0.0 Page 12

3.5 Switch Controls

Table 5 describes the function of FAA20 switches. These switches are

read only during power up.

Table 5: Switch Controls

SWITCH FUNCTION DESCRIPTION

SW1 PCM_MASTER PCM Master Timing. When ON, the FAA20 generates

PCM timing. When OFF, the external device generates

PCM timing.

SW2 NIB_MASTER Nibble Master Timing. When ON, the FAA20 generates

nibble interface timing. When OFF, the external device

generates nibble timing.

SW3 ADAPT_EN Rate Adapter Enable. When ON and the timing mode is

TRUNCATED, the FAA20 enables the rate adapter on the

PCM interface. Set to ON if the truncated PCM frame rate

is 8000. This switch is ignored for TEST mode.

SW4 TRUNC_EN Truncated Mode Enable. When ON, the FAA20 enters

truncated timing mode. When OFF, the FAA20 enters

normal timing mode. This switch is ignored for TEST

mode.

SW5 PCM_SELECT PCM Select. When ON, the FAA20 routes PCM audio to

the vocoder. When OFF, the FAA20 routes codec audio

to the vocoder. This switch is only read when OPMODE is

set to VC20. This switch is ignored for all other modes.

SW6 Reserved Reserved. Set to OFF for future compatibility.

SW7

SW8

OPMODE Operational Mode: Sets the operational mode of the

FAA20. See Section 5.1 for details.

SW7 SW8 Mode

OFF OFF NORM Mode.

OFF ON VC20 Mode.

ON OFF DEMO Mode.

ON ON TEST Mode.

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 18