I'm having an issue with a PCB on which I have a microcontroller and an external SRAM. I don't want to fully describe the problem as I already posted a question regarding that. Link
Since that I found out that maybe there are PCB design issues which could cause the symptoms. Here comes my question which I think it worth to ask separately.
Ideally, the signal should be a square wave with exactly 50ns 0V and ~50ns 3.3V
Volts/DIV: 2 Time axis: 50ns/DIV Attenuation:10x Probe connected to OE pin of the SRAM (farthest point from the driver) Probe ground connected far away to the shielding of a connector
Same as above, except the probe ground is connected directly to the SRAM's GND pin.
About the board:
Power: 3.3v No impedance matching between the chips Trace length:43.215mm
I would not say that 20MHz is high frequency, that's why I didn't care about impedance and termination. Could you please confirm this in addition to your opinion on the signal?