User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
177User Manual 1326.1578.02 ─ 08
Source: CS, Clock, MOSI, MISO
Set the input channels of the SPI lines.
If option R&S RTH-B1 is installed, digital channels can also be used as source.
Remote command:
BUS:SPI:SSEL:SOURce on page 386
BUS:SPI:SCLK:SOURce on page 386
BUS:SPI:MISO:SOURce on page 386
BUS:SPI:MOSI:SOURce on page 386
Polarity
Selects whether the chip select signal is high active (high = 1) or low active (low = 1).
Remote command:
BUS:SPI:SSEL:POLarity on page 386
Slope
Selects if data are sampled on the rising or falling slope of the clock. The clock slope
marks the begin of a new bit.
Remote command:
BUS:SPI:SCLK:SLOPe on page 386
Thresholds, Technology, Find Level
Sets the threshold value for digitization of signals. If the signal value is higher than the
threshold, the signal state is high. Otherwise, the signal state is considered low.
You can select the threshold voltage on all lines for various types of integrated circuits
in the "Technology" list, or set a user-defined value for each line in "Thresholds". You
can also let the instrument set the appropriate thresholds using "Find Level".
Changing the thresholds in the bus configuration changes also the thresholds of ana-
log channels in the "Vertical" menu, or the thresholds of logic channels in the "Logic"
menu.
Remote command:
BUS:SPI:TECHnology on page 386
BUS:SPI:SSEL:THReshold on page 387
BUS:SPI:SCLK:THReshold on page 387
BUS:SPI:MISO:THReshold on page 387
BUS:SPI:MOSI:THReshold on page 387
BUS:SETReflevels on page 376
CHANnel<m>:THReshold:FINDlevel on page 257
Word Length
Sets the number of bits in a word. The maximum length is 32 bit.
Remote command:
BUS:SPI:WSIZe on page 387
Bit Order
Defines if the data of the words starts with MSB (most significant bit) or LSB (least sig-
nificant bit). The display of the decoded signal considers this setting, results are dis-
played in the specified order.
SPI (Option R&S
RTH-K1)