User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
176User Manual 1326.1578.02 ─ 08
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 8-10: 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.
For SPI buses, the R&S RTH provides the following trigger possibilities:
●
On frame start
●
On frame end
●
On a serial pattern at a specified position
8.3.2 SPI Configuration Settings
Access: "Bus" menu > "Bus Protocol" = "SPI" > "Config"
SPI (Option R&S RTH-K1)