TDA5230 Datasheet, PDF (117/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
It is possible to choose which part of the incoming data stream is compared against the
stored MIDs. The register MIDC0 contains the Scan Start Position (Bit 0 to Bit 127). If
the Bit Counter detects the Scan Start Position the Control FSM enables the Scanner.
The register MIDC1 contains the number of bytes to scan (Byte 0 to Byte 3). During the
observation period, the Message ID Scanning is aborted immediately by the Master FSM
if symbol synchronization is lost or an EOM (End Of Message) is detected.
Example:
Start Selection: 0010001b
Number to scan: 00b, 01b, 10b, 11b
FSYNC
Bit 0 1 2
17 18
Number To Scan=00b
Number To Scan=01b
Number To Scan=10b
Number To Scan=11b
Byte0
Byte0
Byte0
Byte0
24 25 26 27
Start MID Scan
Byte1
Byte1
Byte1
33 34 35 36
Byte2
Byte2
42 43 44 45
Byte3
51 52 53
Figure 59 ID Scanning
The starting position in this case is Bit 17. Depending on the number to scan, the
corresponding number of bytes is compared with the stored MIDs.
Dual: AMID0-AMID19 and BMID0-BMID19: Conf.A Message ID Register0
ADDR: 0x29-0x3C and 0x4A-0x5D
Bit R/W Description
7:0 W MID0: Message ID Register
Reset Value:0x00
Dual: AMIDC0 and BMIDC0: Conf.A Message ID Control Register0
ADDR: 0x3D and 0x5E
Reset Value:0x00
Bit R/W Description
6:0 W SP: MID scan start position
Min: 00h = Comparison starts one bit after FSYNC
Max: 7F = Comparison starts 128 bits after FSYNC
Data Sheet
113
Version 4.0, 2007-06-01