JESD204A vs. JESD204B: Key Differences Explained
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This article compares JESD204A and JESD204B, highlighting the key differences between the two standards in a tabular format.
Key Feature Comparison: JESD204A vs. JESD204B
The following table summarizes the main differences between JESD204A and JESD204B:
Features | JESD204A | JESD204B |
---|---|---|
Interface Diagrams | ![]() | ![]() |
Release | 2008 | 2011 |
Lane Rate (Maximum) | 3.125 Gbps | 12.5 Gbps |
Clock Signal | The frame clock signal in the system is equal to the frame rate of the data on the link. In JESD204A, the frame clock is the master timing reference. | The device clock signal in the system can be used to derive the frame rate of the data on the link. In JESD204B, the frame clock is no longer the master system reference. |
SYNC | A system synchronous, active low signal from the receiver to the transmitter denotes the state of synchronization. | Same as JESD204A, except synchronous to the local multi-frame clock (LMFC) instead of the frame clock. |
Lane 0,…,L-1 | Differential lanes on the link (typically high-speed CML). 8B/10B code groups are transmitted MSB first/LSB last. | Same as JESD204A |
Multiple Lanes | Supported | Supported |
Lane Synchronization | Supported | Supported |
Multi-Device Synchronization | Supported | Supported |
Deterministic Latency | Not Supported | Supported |
Harmonic Clocking | Not Supported | Supported |