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Protocol analysis
R&S
®
MXO 4 Series
283User Manual 1335.5337.02 ─ 05
13.2 SPI bus (option R&S MXO4-K510)
The Serial Peripheral Interface SPI is used for communication with slow peripheral
devices, in particular, for transmission of data streams.
13.2.1 The SPI protocol
A 4-channel instrument is required for full support of the SPI protocol, or the MSO
option R&S MXO4-B1.
The Serial Peripheral Interface SPI is used for communication with slow peripheral
devices, in particular, for transmission of data streams.
Main characteristics of SPI are:
●
Master-slave communication
●
No device addressing; The slave is accessed by a chip select, or slave select line.
●
No acknowledgement mechanism to confirm receipt of data
●
Duplex capability
Most SPI buses have four lines, two data and two control lines:
●
Clock line to all slaves (SCLK)
●
Slave Select or Chip Select line (SS or CS)
●
Master data output, slave data input (MOSI or SDI)
●
Master data input, slave data output (MISO or SDO)
When the master generates a clock and selects a slave device, data may be transfer-
red in either or both directions simultaneously.
Figure 13-2: Simple configuration of SPI bus
The data bits of a message are grouped by following criteria:
●
A word contains a number of successive bits. The word length is defined in the pro-
tocol configuration.
●
A frame contains a number of successive words, at least one word.
13.2.2 SPI configuration
13.2.2.1 Setup
Access: [Apps] key > "Protocol" tab > "SPI" > "Setup".
SPI bus (option R&S
MXO4-K510)
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