4.8.5 RX DSP Enable State Machine
The RX DSP enable state machine enables the modules that are needed for reception only. It expects a successful run of PLL lock as a prerequisite. The state machine switches the RX DSP on including the channel filter and demodulator paths A/B as configured. The antenna damping and the IF amplifier circuitry is set up if configured in the SSMRCR register. The RX DSP enable state machine turns on the antenna tuning bias CPBIA and the ADCLK.
In addition, the SOT and the EOT condition flags are copied from the SOT1A/B and the EOTC1A/B registers to the demodulator registers SOTCA/B and EOTCA/B.
After having successfully passed the RX DSP enable state machine, the design is set up for reception and the flow control can be passed to the get telegram state machine.
|
Setting |
Description |
|---|---|
|
SSMCR.SSMTM |
Enables temperature block in RX DSP. |
|
SSMRCR.SSMIFA |
Switches the IF amplifier on only if configured. |
|
SSMRCR.SSMPA/B |
Enables the demodulator path A/B in RX DSP. |
|
SSMCR.SETRPA/B |
Enables the transparent output. |
|
SSMRCR.SSMADA/B |
Enables/disables automatic antenna damping. |
|
SSMFBR.SSMFID |
Adjusts the settling wait time for internal filters. |
|
SSMFBR.SSMDFDT | |
|
SOTC1A/B |
Copies these settings to the demodulator registers as initial conditions. |
|
EOTC1A/B |