Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 87)

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 81

8.3.16 FM

The FM command is used to access flash memory.

Although the flash memory data bus is one byte wide, the FAA20 software

always accesses word values, i.e. two sequential locations are accessed to

form a 16-bit word. A single word can be read/written or a block of memory

can be printed. Only blank memory locations (value = 0xFFFF) can be

written.

Flash memory addresses are two words long (32-bits total). The first word

represents the flash page (valid values 0 to 8) and the second word

represents the data memory offset location (valid values 0x8000 to

0xFFFF). Flash page 0 is the protected flash segment (see FLASH

command). Flash pages 1 through 7 contain the main software application.

Flash page 8 contains flash configuration parameters (see CFG command).

Table 27: FM Command Syntax

ATTRIBUTE DESCRIPTION

SYNTAX FM addr [hexdata]

FM startaddr [ .. endaddr | + length ]

FM ERASE [pageno]

Addr Long Data Memory Address (hexadecimal). Data memory

addresses are 32-bit.

startaddr Long Starting Address for a block print (hexadecimal).

endaddr Long Ending Address for a block print (hexadecimal).

length Length (number of words) of block to print (hexadecimal).

PARAMETERS

hexdata Hexadecimal data value (16-bit).

FLASH This low level command directly accesses flash memory.

Read the protected flash configuration area (e.g. serial number and

calibration values).

COM1: fm fff0 + 4

> FM 0000FFF0 = 0259 1887 0D39 FFFF

EXAMPLES

Erase the flash configuration parameter block.

COM1: fm erase 8

> FM ERASE 8

Note: Do not enter any leading ‘0x’ characters.

Note: Insure you add spaces to separate ‘+’ and ‘..’ character strings.

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 87