FX929AD2 datasheet(20/44 Pages) CMLMICRO

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4-Level FSK Modem Data Pump

FX929A

D/929A/4

TSID: Transmit Station ID

This task takes 3 ID bytes from the Data Block Buffer, calculates and appends the 6-bit CRC0 checksum,

translates the result to 4-level symbols (with FEC) and transmits the resulting 22 symbols preceded and

followed by 'S' symbols.

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

RESET: Stop any current action

This 'task' takes effect immediately, and terminates any current action (task, AQSC or AQLEV) the modem may

be performing and sets the BFREE bit of the Status Register to '1', without setting the IRQ bit. It should be used

when VDD is applied, to set the modem into a known state.

Note that due to delays in the RRC filter, it will take several symbol times for any change to appear at the TXOP

pin.

Task Timings

from task #2

from task #3

from task #1

Task to Command Register

Data to Data Block Buffer

Modem Tx output

Symbols to

RRC filter

IBEMPTY bit

BFREE bit

Figure 10 Transmit Task Timing Diagram

Task

Time

(symbol times)

Modem in idle state. Time from writing first

task to application of first transmit bit to Tx

RRC filter

Any

1 to 2

Time from application of first symbol of the

T24S

task to the Tx RRC filter until BFREE goes

TSID

to a logic '1' (high).

THB/TIB/TLB

T4S

Time to transmit all symbols of the task

T24S/TSID

THB/TIB/TLB

T4S

Max time allowed from BFREE going to a

T24S

logic '1' (high) for next task (and data) to

TSID

be written to modem

THB/TIB/TLB

T4S

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