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SN75LVCP601 6Gbps issues

Other Parts Discussed in Thread: SN75LVCP601

Hello TI,

I have inherited a long standing problem of a design utilizing (4) SN75LVCP601 to re-drive 4 SATA channels. The parts operate fine at Gen 2 speeds but become intermittent at Gen 3 speeds. There is no cable involved, rather 20' of FR4 traces.

Changing EQ/DE have no effect, I see about 155 mV of noise on the 3.3 VDC pin.  Could this be a problem?