FX929AD2 datasheet(19/44 Pages) CMLMICRO

19 / 44 page

4-Level FSK Modem Data Pump

FX929A

D/929A/4

'Symbol Sync'

Values written to Data Block Buffer

Symbols

Binary

Hex

-3

Byte 0:

11110101

-3

Byte 1:

11110101

-3

Byte 2:

11110101

-3

Byte 3:

11110101

-3

Byte 4:

11110101

-3

Byte 5 :

01011111

'Frame Sync'

Values written to Data Block Buffer

Symbols

Binary

Hex

-1

Byte 0:

00100010

-1

-3

Byte 1:

00110111

-3

-1

-3

Byte 2:

01001001

-1

Byte 3:

11110010

-3

Byte 4:

01011011

-1

-3

Byte 5:

00011011

THB: Transmit Header Block

This task takes 10 bytes of data (Address and Control) from the Data Block Buffer, calculates and appends the

2-byte CRC1 checksum, translates the result to 4-level symbols (with FEC), interleaves the symbols and

transmits the result as a formatted 'Header' Block , inserting 'S' symbols at 22-symbol intervals.

Once the modem has read the data bytes from the Data Block Buffer, the BFREE and IRQ bits of the Status

TIB: Transmit Intermediate Block

This task takes 12 bytes of data from the Data Block Buffer, updates the 4-byte CRC2 checksum for inclusion

in the 'Last' block, translates the 12 data bytes to 4-level symbols (with FEC), interleaves the symbols and

transmits the result as a formatted 'Intermediate' Block , inserting 'S' symbols at 22-symbol intervals.

Once the modem has read the data bytes from the Data Block Buffer, the BFREE and IRQ bits of the Status

TLB: Transmit Last Block

This task takes 8 bytes of data from the Data Block Buffer, updates and appends the 4-byte CRC2 checksum,

translates the resulting 12 bytes to 4-level symbols (with FEC), interleaves the symbols and transmits the result

as a formatted 'Last' Block , inserting 'S' symbols at 22-symbol intervals.

Once the modem has read the data bytes from the Data Block Buffer, the BFREE and IRQ bits of the Status

T4S: Transmit 4 Symbols

This task is similar to T24S but takes only one byte from the Data Block Buffer, transmitting it as four 4-level

symbols.

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