Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 69)

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 63

Table 13: BIT Command Parameters

BITNAME ATTRIBUTES* DESCRIPTION

LED1 RW, SWC LED #1 (red). Typically indicates peak audio events.

LED2 RW, SWC LED #2 (yellow). Typically indicates audio activity.

LED3 RW, SWC LED #3 (green). Typically indicates truncated timing

mode.

LED4 RW, SWC LED #4 (red). Typically indicates errors or sample

add/drop events.

LED5 RW, SWC LED #5 (yellow). Typically indicates vocoder activity.

LED6 RW, SWC LED #6 (green). Typically indicates FAA20 runtime

status.

LPCM RW, SWC PCM Timing Master. When set, configures the FAA20

to drive the PCM clock and framing signals.

Note: While the BIT command will directly control the

associated signal direction, other timing dependent

FAA20 functions are not updated by the BIT

command. Therefore, the preferred control method for

PCM master timing is SW1.

LCVM RW, SWC Nibble Timing Master. When set, configures the

FAA20 to drive the nibble clock and framing signals.

Note: While the BIT command will directly control the

associated signal direction, other timing dependent

FAA20 functions are not updated by the BIT

command. Therefore, the preferred control method for

PCM master timing is SW2

LFSD RW, SWC Local Decoder Frame Sync Control. When LCVM=1,

this bit controls the decoder frame sync signal, FMDE.

LFSE RW, SWC Local Encoder Frame Sync Control. When LCVM=1,

this bit controls the encoder frame sync signal, FMEN.

PWDN RW Codec Power Down Control. When set, it powers

down the codec.

LOOP RW Codec External Loop Control. When set, the codec

loops received audio out the transmit port.

Note: When this bit is set, any output provided by the

internal mixer is summed with the looped back input

signal.

TRUN RW, SWC Codec Truncated Timing Control. When set, the

codec sample rate is set to 6.67 ksps.

WDOG RW, SWC Watch Dog Tickle Control. Toggling of this bit keeps

the watchdog from resetting the processor.

XFSD RO External Decoder Frame Sync Bit. This read-only bit

dis plays the current state of the decoder frame sync

signal, FMDE.

XFSE RO External Encoder Frame Sync Bit. This read-only bit

displays the current state of the encoder frame sync

signal, FMEN.

RUN RW, SWC Vocoder Run Status Signal. When set, indicates that

the encoder and/or decoder process is executing.

Note: For all operational modes except the TEST

mode, this bit is software controlled.

DDAT RW, CL, RSVD DDAT Signal Control Bit (DTMF Data). Reserved for

future use.

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 108 109

Comentarios a estos manuales

Sin comentarios

Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 69

Comentarios a estos manuales