Data Sheet

8 Protocol Decoding RIGOL
MSO4000D/S4000 User’s Guide
8-13
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
Press Decode1  Decode to select “SPI” and open the SPI decoding function
menu.
1. Decoding mode
Press Mode to set the desired decoding mode.
 CS: press SS to enter the chip select line setting interface. Press Channel
to select D0-D15 or CH1-CH4 as the chip select channel. When CH1-CH4 is
selected, press Threshold to set the threshold of the selected channel.
When D0-D15 is selected, the threshold does not need to be set. Press
Polarity to set the polarity of the chip select channel to (positive
polarity) or (negative polarity). Note that the SS softkey is only valid
when this mode is selected.
 TimeOut: press TimeOut to set the timeout time and the range available is
from 1 ns to 1 s. Note that at this point, the SS softkey is invalid (not
displayed).
2. SCLK Setting
Press SCLK to turn on the clock line setting interface.
 Press Channel to select any channel (CH1-CH4 or D0-D15) 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.