SVI3 Protocol Support
PowerAMD Serial VID Interface 3
What is SVI3?
SVI3 (Serial VID Interface 3) is AMD's proprietary serial bus protocol for communication between AMD processors and voltage regulator modules (VRMs). SVI3 uses three signals — SVC (clock), SVD (data), and SVT (telemetry) — to manage dynamic voltage and frequency scaling. The protocol enables the processor to command voltage changes, read VRM telemetry (current, temperature), and manage power states. SVI3 operates at clock speeds up to 50 MHz with a voltage range of 1.08V to 1.98V, and includes features for fast transient response and power state management that are critical for AMD Ryzen and EPYC processor platforms. Acute decoders cover SVI3 Rev. 1.01 and Rev. 2.0. Engineers debugging AMD power delivery systems need SVI3 decode to verify voltage requests, telemetry accuracy, and VRM response timing.
SVI3 Quick Reference
| type | Serial, synchronous |
| signals | SVC, SVD, SVT (3 wires) |
| max Speed | Up to 50 MHz |
| voltage Range | 1.08V – 1.98V |
| standard | AMD SVI3 Rev. 1.01, Rev. 2.0 |
Important Notice
SVI3 protocol support is available only on the MSO2216B, MSO3124H, and MSO3124V. SVI3 decoding is provided to end customers upon request, and only to users who have been approved by AMD.
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How to Analyze SVI3 with Acute Instruments
Connect your Acute logic analyzer to the SVI3 SVC, SVD, and SVT signals between the AMD processor and the voltage regulator.
Attach a ground lead to the target board's ground reference.
In the Acute software, select the SVI3 protocol decoder and assign SVC, SVD, and SVT to the correct input channels.
Configure the decoder for the expected bus speed and protocol version.
Capture and view decoded SVI3 transactions showing voltage ID commands, telemetry readbacks, and power state transitions.