Digital Voice Systems VC-20-ATC-10B Specifikace stáhnout pdf (Strana 57)

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 51

7.3.2 Acknowledgement Mode Upgrade

The FAA20 supports a virtual command (COM3) port over the nibble

interface (see Section 5.2.3). The acknowledgement mode configures the

FAA20 to print an acknowledgement message after each S-record is

successfully processed. This allows the host equipment to insure the

previous S-record has been successfully processed before transmitting the

next S-record. Note that the COM3 transmission rate is depending on the

nibble interface clock rate and frame size. For a typical setup (9600 Hz and

192 clocks/frame), the average byte transmission rate (not including flash

programming time) is 3000 char/sec.

To upgrade the FAA20 software using COM3, complete the following steps.

1. Send the PROG ACK command.

The FAA20 erases the main application flash memory to prepare

memory to be reprogrammed. The FAA20 prints an ERASING

FLASH message and then prints a READY message when this

process has been completed. The host software should wait for the

READY message before transmitting any S-record lines. Note also

that any other command traffic should be disabled before attempting

a software upgrade.

2. Send the first S-record line.

The FAA20 programs data associated with the record and then

prints an acknowledgement message, > ACK 0000. Always wait for

the FAA20 to acknowledge receipt of the current record before

transmitting the next record.

3. Send the next S-record line.

The FAA20 programs data associated with the line and then prints

an acknowledgement message, > ACK xxxx where xxxx is an

incrementing hex value for each record.

4. Repeat step #3 as necessary until all records are transmitted and

programmed.

The FAA20 continues to print ACK messages. After the last ACK

message, the FAA20 also prints a DONE message. The last record

(an S8 record) in the file indicates the end of the file and includes a

file checksum sequence.

5. Enter the RESET command to force the FAA20 to load the new

program.

After waiting 5 seconds for the power up sequence to complete, a

test command can be issued to the FAA20 to insure the unit has

rebooted.

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Digital Voice Systems VC-20-ATC-10B Specifikace Strana 57