Hi, I'm trying to use the PMODs on the Cora Z7-10 to accept high-speed single ended signals from another board I am making.
In the reference manual for this device it says:
Quote
If pins on this port are used as single-ended signals, coupled pairs may exhibit crosstalk. In applications where this is a concern, one of the signals should be grounded (drive it low from the FPGA) and use its pair for the signal-ended signal.
So my question is in regards to proper grounding here. If I have a pair JA1_P and JA1_N and want to use JA1_P as the single-ended input. It says I should drive JA1_N low on in the FPGA fabric, but do I also need to connect the output of that to ground (it kind of seems like I should)? I'm perhaps a little worried about ground spikes, so if I do, should I put a series resistor in with it? Will this affect the single-ended speed potential? My data rate is ~500Mbps on each line.
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RyanW
Hi, I'm trying to use the PMODs on the Cora Z7-10 to accept high-speed single ended signals from another board I am making.
In the reference manual for this device it says:
So my question is in regards to proper grounding here. If I have a pair JA1_P and JA1_N and want to use JA1_P as the single-ended input. It says I should drive JA1_N low on in the FPGA fabric, but do I also need to connect the output of that to ground (it kind of seems like I should)? I'm perhaps a little worried about ground spikes, so if I do, should I put a series resistor in with it? Will this affect the single-ended speed potential? My data rate is ~500Mbps on each line.
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