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Protocol analysis
R&S
®
MXO 5 Series
293User Manual 1802.3369.02 ─ 02
●
ASCII: In the ASCII column, "X" is the character X. The binary X (do not care) is
not allowed. If an X is included in the binary value in the left column, the ASCII col-
umn displays "§" to indicate that the value is not defined.
●
Unsigned: Decimal data format without sign. 3 digits are grouped and next group is
separated by comma, e.g. 653,848.
●
Signed: Signed decimal format. 3 digits are grouped. The first bit represents the
sign. You can use the 2's complement format. 3 digits are grouped and next group
is separated by comma, e.g. -653,848.
13.2 SPI bus (option R&S MXO5-K510)
The Serial Peripheral Interface SPI is used for communication with slow peripheral
devices, in particular, for transmission of data streams.
Required options and equipment
For performing SPI decode measurements, you need the following equipment:
●
R&S MXO 5 with 4 channels. The channels can be a combination of the following:
– Analog channels (C1-C4)
– Logic channels (D0-D15) (requires option R&S MXO5-B1)
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Option R&S MXO5-K510
13.2.1 About the SPI protocol
A 4-channel instrument is required for full support of the SPI protocol, or the MSO
option R&S MXO5-B1.
The Serial Peripheral Interface SPI is used for communication with slow peripheral
devices, in particular, for transmission of data streams.
Main characteristics of SPI are:
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Main-subnode communication
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No device addressing. The sub is accessed by a chip select, or sub select line.
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No acknowledgment mechanism to confirm receipt of data
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Duplex capability
Most SPI buses have four lines, two data and two control lines:
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Clock line to all subs (SCLK)
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Sub select or Chip select line (SS or CS)
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Main data output, sub data input (MOSI or SDI)
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Main data input, sub data output (MISO or SDO)
When the main generates a clock and selects a sub device, data may be transferred in
either or both directions simultaneously.
SPI bus (option R&S
MXO5-K510)
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