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SX1211
WIRELESS & SENSING
5. Data Processing
5.1. Overview
5.1.1. Block Diagram
Figure 25, illustrates the SX1211 data processing circuit. Its role is to interface the data to/from the
modulator/demodulator and the uC access points (SPI, IRQ and DATA pins). It also controls all the configuration
registers.
The circuit contains several control blocks which are described in the following paragraphs.
Tx/Rx
SX1211
DATA
CONTROL
IRQ_0
IRQ_1
Data
Rx
SYNC
SPI
Tx
RECOG.
PACKET
HANDLER
FIFO
(+SR)
CONFIG
DATA
NSS_DATA
SCK
MOSI
MISO
Figure 25: SX1211’s Data Processing Conceptual View
The SX1211 implements several data operation modes, each with their own data path through the data processing
section. Depending on the data operation mode selected, some control blocks are active whilst others remain
disabled.
5.1.2. Data Operation Modes
The SX1211 has three different data operation modes selectable by the user:
Continuous mode : each bit transmitted or received is accessed in real time at the DATA pin. This mode may be
used if adequate external signal processing is available.
Buffered mode : each byte transmitted or received is stored in a FIFO and accessed via the SPI bus. uC
processing overhead is hence significantly reduced compared to Continuous mode operation. The packet
length is unlimited.
Packet mode (recommended) : user only provides/retrieves payload bytes to/from the FIFO. The packet is
automatically built with preamble, Sync word, and optional CRC, DC free encoding and the reverse operation is
performed in reception. The uC processing overhead is hence reduced further compared to Buffered mode.
The maximum payload length is limited to the maximum FIFO limit of 64 bytes
Rev 8 – February 2013
Page 34 of 92
www.semtech.com
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