Usb Decode (Optional) - UNI-T UPO3000E Series User Manual

Trigger Condition:
Press PgDn trigger condition to set the I2C trigger condition: Start, restart,
stop, loss, address, data, address & data.
(1) Start: Triggers at the start time, that is, while the SCL is in high level, the
SDA signal has a falling edge.
(2) Restart: Triggers at the restarting moment, that is, after a start signal,
and before it stops, the start signal appears again.
(3) Stop: Triggers when the stop bit occurs, that is, while the SCL is in high
level, the SDA signal jumps from low to high.
(4) Loss: In I2C protocol, every time after 8 bits of information are transmitted,
the data receiver needs to send an acknowledgement signal, which is the
ACK bit in the above figure when the SCL is in high level, the SDA signal
is low. The loss trigger will occur while the SCL and SDA signal at the ACK
bit are both high.
(5) Address: Triggers when the communication address is the same with the
user setting address. It can help to quickly locate the address transmission.
(6) Data: Triggers when the detected data is equal to/greater than/less than
/not equal to the set Value. This feature is convenient for the data analysis
and can capture the abnormal data.
(7) Address & Data: Triggers when the addresses are the same and the data
relationship meets the set conditions during the transmission process.
This trigger condition makes it easy to implement the I2C's specified
address and data trigger, and help to analyze the transmission.
Data Setting:
Press PgDn data setting to enter the data setting menu.
(1) Comparison condition: Used to determine the data, you can select >, <, =.
>: Valid when the trigger condition is data or address/data, triggers when
the actual I2C protocol data is greater than the set data.
<: Valid when the trigger condition is data or address/data, triggers when
the actual I2C protocol data is less than the set data.
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=: Valid when the trigger condition is data or address/data, triggers when
the actual I2C protocol data is equal to the set data.
(2) Bytes: Valid when the trigger condition is data or address/data, set the
data byte size of the specified data from 1~5.
(3) Data: Valid when the trigger condition is data or address/data, each byte
length can be set from 00 ~ FF (hexadecimal number). You can set the
data by the Multipurpose knob, and press the back key to return to the
previous setup menu.
Decode Bus:
Please refer to the RS232 Decode Bus.
Trigger Setting:
Please refer to the Trigger Setting in the "Edge Trigger" section for more
details.

6.3 USB Decode (Optional)

USB（Universal Serial Bus）is a serial bus standard for connecting computer
systems to their peripheral devices, and it is also a technical specification
for input and output interfaces. USB uses differential pairs to transmit signals,
different protocol versions define different transmission rates such as low
speed (1.5Mbps), full speed (12Mbps), high speed (480Mbps), and over
speed (5Gbps). The UPO3000E provides both low speed and full speed rates.
USB Selection:
Press DECODE type, and select USB by the Multipurpose knob. You
can also switch the trigger type by consecutively pressing the type key, then
press the Multipurpose knob to confirm.
D + Source:
Press the D + source key to set any of CH1 ~ CH4 as the USB D+ input.