TDA5230 Datasheet, PDF (53/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
Notes to State Diagram Run Mode Self Polling:
1. Modulation Switching: Modulation is set according registers AMT and BMT bits MT.
2. Init: The Receiver will be initialized and the FIFO will be initialized and cleared when
the SFR control bit INITFIFO is set. Read out the Modulation Type Configuration
(ASK or FSK), which is defined in the SFR control bits AMT/BMT, and set the device
to the configured mode. Set the channel to the correct value, which is defined in the
ARFPLL1/BRFPLL1 register.
3. FIFO locked: When the signal fifolk is set, the chip enters this state and remains
there until the signal fifolk is deasserted. In this state, no further data reception is
possible and therefore no SYNC or FSYNC will be generated, even if a data packet
is present in the received data-stream. (More information on the FIFO behavior can
be found in Chapter 2.4.15 Data FIFO).
4. Wait: Wait until symbol synchronization has finished. A loss of symbol
synchronization always leads into this state, whatever the current state was. This
state is only left, if symbol synchronization could be established on the received data
stream. (More information on the synchronization behavior can be found in
Chapter 2.4.13 Frame Synchronization).
5. Wait: Wait until a start of a data packet (TSI) is detected. All bits received from
FSYNC until the detection of EOM will be transferred to the FIFO.
6. INIT FIFO: The FIFO will be initialized, if the SFR control bit FSINITFIFO is set
7. Check MID Setup: Check the configuration of the Message ID Unit. Depending on
the SFR control bit MIDSEN, a Message ID scanning is started or not. If no Message-
ID scanning is selected, the next state is the EOM check state. Otherwise, the
Message ID scanning unit is activated to search for a valid Message-ID.
8. Init MID Scanning Unit: Initialize the Message-ID scanning unit.
9. Wait: Wait until the Message-ID scanning unit has finished the search for a valid
message ID. All incoming data is stored in the FIFO.
10. Checking ID Scanning Result: The result of a search for a Message ID is checked.
If no valid Message ID was found, a search for a new frame is started. Be aware that
all received bits after FSYNC were stored in the FIFO, even if no Message ID was
found. After a successful search for a Message ID , the next state will be EOM check.
11. EOM Check: The reception of the data frame is completed with EOM. Dependent on
register AEOMC and BEOMC, EOM can be either Sync lost, code violation or
number of received bits.
Data Sheet
49
Version 4.0, 2007-06-01