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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 71

8.3.7 CLKSRC

The CLKSRC command configures the timing source for timing for the PCM

and NIB ports. Either internal or external timing can be selected. When

internal timing is selected, the FAA20 drives the clock and frame sync

signals for the port. The CLKRATE and FRAMESIZE settings are used to

determine clock and frame rates, respectively.

Table 18: CLKSRC Command Syntax

ATTRIBUTE DESCRIPTION

SYNTAX CLKSRC [port [dir]]

port PCM = Digital Data Port

AUD = Audio Port (default).

PARAMETERS

dir INT = internal timing

EXT = external timing

FLASH NO

Print current clock source settings.

COM1: clksrc

> CLKSRC PCM = INT

> CLKSRC NIB = INT

EXAMPLES

Set nibble clock to external.

COM1: clkref nib ext

> CLKREF NIB = EXT

During power up, the FAA20 always configures the PCM and NIB interface

clock sources based on switches SW1 and SW2, respectively. This can be

changed after power up by using the CLKSRC command.

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Digital Voice Systems VC-20-ATC-10B Spezifikationen Seite 77