Rigol DHO914 DHO900 series user manual

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Address information in decoding

For I2C bus, each frame of data starts with the address information (read address and

write address). In the address information, "Read" indicates the read address

(

) and "Write" indicates the write address ( ). You can decide

whether to include or exclude the "R/W" bit for the address information.

Error expressions in decoding

In I2C decoding, the response includes ACK (acknowledgment) and NACK (non-

acknowledgment). When NACK is detected after "Write", red error report information

(

) is displayed.

18.4 SPI Decoding

SPI bus is based on the master — slave configuration and usually consists of chip

select line (CS), clock line (CLK), and data line (SDA). Wherein, the data lines include

the master input/slave output (MISO) data line and master output/slave input (MOSI)

data line. The oscilloscope samples the channel data on the rising or falling edge of

the clock signal and judge each data point (logic "1" or logic "0") according to the

preset threshold level.

Master

Slave

MOSI

CLK

MISO

CLK

SDA

(MISO/MOSI)

Figure 18.10 SPI Serial Bus

In the

Decode menu, click or tap the drop-down button of Bus Type to select SPI,

then configure the parameters for SPI decoding.

Protocol Decoding

207

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Rigol DHO914 oscilloscope