Keysight (Agilent) U4421A MIPI D-PHY Protocol Analyzer/Exerciser

The Keysight U4421A MIPI D-PHY Protocol Analyzer/Exerciser is an AXIe-based module for testing, analysis, and debugging of MIPI D-PHY interfaces used in CSI-2 and DSI applications. It combines protocol analysis and traffic generation in a single instrument, supporting real-time data capture, protocol-level triggering, error injection, and multi-lane signal characterization. Engineers gain insight into complex multi-bus MIPI systems, resolving challenges from high-speed data bursts, multi-lane integration, and HS/LP signal switching.

Technical Specifications

• Data Rates: Up to 1.5 Gbps per lane (2.5 Gbps per lane available)


• Trace Memory: 1 GB standard; 4 GB and 16 GB options available. User-allocable across Exerciser, Analyzer, and Raw Mode


• Channel Configuration: 1, 2, or 4 data channels plus clock lane


• Dual Mode Operation: Functions as analyzer, exerciser, or both simultaneously

Key Features Protocol Analysis

• Full MIPI D-PHY protocol analysis for CSI-2 and DSI traffic


• Protocol-aware triggering with packet-level filtering and storage qualification


• N-way trigger branching and complex if-then-else trigger logic


• Raw data view providing oversampling of states for detailed protocol insight Protocol Exerciser


• Flexible traffic generation via GUI, packet inserter, and image inserter


• HS/LP mode transmission capability


• Signal parameter control: speed, slew rate, voltage levels, and lane skew adjustment


• Image-based traffic generation with CSV file conversion and sequenced transmission


• Internal loopback verification with analyzer options

Typical Applications

• Mobile device camera and display interface validation


• Automotive imaging system development


• IoT sensor integration testing


• CSI-2 and DSI protocol compliance verification

Compatibility & Integration AXIe form factor integration with shared memory allocation across analysis and generation functions.