Keysight U4421A MIPI D-PHY Analyzer and Exerciser Hardware and Probing Guide
11
U4421A Module
1
As shown in
, the U4421A module has the following components:
Component
Description
Interface Port
This component is used to share information with another U4421A module in the same chassis. The
features of this component are not yet supported.
Exerciser Port
This component is used to connect the U4421A module with a DUT using the Keysight U4422A SMA
stimulus probing cable.
You use this component when you plan to use the U4421A module as an Exerciser to provide stimulus to
the DUT.
Lane Status LEDs
The module supports four lanes. For each of these lanes, a lane status LED is provided, labeled 0 to 3, to
indicate the status of the lane. The following color coding is used for these LEDs to indicate the lane
status.
• Red
- This means that the lane is in the STOP state with LP11.
• Blinking
Red
- This means that the lane is in the STOP state with LP00. This lane status usually
indicates:
• LP lines are not probed
• ultra-low power mode
• Green
- This means that the lane has moved to LP00 via a HS request and it is waiting for the sync
pattern. This lane status occurs when something is wrong, for instance, incorrect probing setup or the
lane not receiving correct HS data.
• Blinking Green
- This means that the line is between HS sync and HS exit. and the lane is receiving HS
data.
• Yellow
- This means that the lane is in the Escape mode and data is being transmitted from master to
slave. Escape mode includes bus turn around (BTA), escape mode data transmission, and ULPM
request.
• Blinking
Yellow
- This means that the lane is in the Escape mode and data is being transmitted from
slave to master. Escape mode includes bus turn around (BTA), escape mode data transmission, and
ULPM request.
• Off
- This means that the lane is not configured/available. Based on the link width that you select in
the U4421 Connection Setup tab of the Logic and Protocol Analyzer GUI, the number of lanes on the
U4421A module are used. The LEDs of only the used lanes glow. For example, if you are using the x2
link width, then the LEDs of only two lanes being used will glow and the rest of the LEDs will be off.
All Lane Status LEDs will be off until the host computer has established a connection to the chassis and
module and the Logic and Protocol Analyzer application has started.
Clock Status LED
This LED indicates the status of the clock lane.
The following LED color coding is used to indicate the state activity on the clock lane.
• Red
- This means that the lane is in the STOP state with LP11.
• Blinking
Red
- This means that the lane is in the STOP state with LP00. This lane status usually
indicates:
• LP lines are not probed
• ultra-low power mode
• Green
- This means that the line is between HS sync and HS exit. and the lane is receiving HS data.
• Yellow
- This means that the lane is in the Escape mode which includes bus turn around (BTA), escape
mode data transmission, and ULPM request.
The Clock Status LED will be off until the host computer has established a connection to the chassis and
module and the Logic and Protocol Analyzer application has started.
Analysis Port
This component is used to connect the U4421A module with Keysight differential flying lead or soft touch
probe via a U4201A 90-pin cable. You use this component when you plan to use the U4421A module as
an Analyzer to capture and analyze data from DUT.
