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opencomputeproject / Time-Appliance-Project

Develop an end-to-end hypothetical reference model, network architectures, precision time tools, performance objectives and the methods to distribute, operate, monitor time synchronization within data center and much more...
MIT License
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SMA TVS not connected to +3.3V #91

Open wisxxx opened 1 year ago

wisxxx commented 1 year ago

The transient voltage suppressors (TVS), IC's CR4 and CR5 (schematic sht. 23, D12 and H12) are not connected to +3.3V (net XP3R3V_FPGA), thus offer no protection for the '125 buffers against positive voltage spikes on the SMA inputs.

(production board)

wisxxx commented 1 year ago

Likewise for CR6 and CR7 on the external JTAG connector (sht. 10, L4 and L5).