GW Instek GDS-2000A series Quick start guide for Logic analyzer option - Manual (Page 12)

SPI Bus
The serial peripheral interface (SPI) is a full duplex 4
wire synchronous serial interface. The word size is
configurable from 4 to 32 bits. The SPI bus triggers on
the data pattern at the start of each framing period.
1. Press the Bus soft-key and select SPI.
2. Press Define Inputs to select the SCLK, SS, MOSI
and MISO inputs.
3. Press Thresholds to set the thresholds.
 There are 5 pre-set threshold levels in
addition to the User-defined threshold
setting (TTL, 5.0V CMOS, 3.3V CMOS,
2.5V CMOS, ECL, PECL, 0V).
4. Press Configure to set the data line logic level,
SCLK edge polarity, word size and bit order.
5. Press Bus Display to configure how the data is
displayed, either hex or binary.
6. Press Event Table to view or save the decoded data
in a list.
7. Press Edit Labels to create an on-screen label for
the bus.