User Manual

RIGOL 7 Protocol Decoding
DS4000 User’s Guide
7-10
SPI Decoding (Option)
SPI serial bus consists of chip select line (SS), clock line (SCLK), MISO and MOSI.
Host Device
SS
MISO
MOSI
SCLK
SCLK
MOSI
MISO
SS
MISO
MOSI
SCLK
SS
SS: set the polarity to “Low” or “High”. When SS selection is valid, the SPI bus
samples data from MISO and MOSI at the jumping point of SCLK.
SCLK: sample data from MISO and MOSI on the clock rising edge or falling edge.
MISO: master input/slave output. Set the polarity to “Low” or “High”.
MOSI: master output/slave input. Set the polarity to “Low” or “High”.
Press Decode1  Decode to select “SPI” and open the SPI decoding function
menu.
1. SS Setting
Press SS to turn the chip select line setting interface on.
 Press Channel to select any channel (CH1 to CH4) as the chip select
channel. When “OFF” is selected, the sample of MISO and MOSI occurs at
the jumping point of SCLK.
 Press Polarity to set the polarity of the chip select channel to “Low” or
“High”.
 Press Threshold to set the threshold of the selected channel.
2. SCLK Setting
Press SCLK to turn on the clock line setting interface.
 Press Channel to select any channel (CH1 to CH4) as the clock channel.
 Press Slope to set the instrument to sample MISO and MOSI on the rising
edge or falling edge of SCLK.
 Press Threshold to set the threshold of the clock channel.