I would like to ask a question about the output signal “TX” from the MSC-MOD20.
What kind of output level is the TX signal after reset until the banner is output? (High-Z or weak-pull up/down?)
When measuring the TX pin with an oscilloscope, the level is low during this period.
This level also goes low when you touch the TX pin with my finger.
I would like to set this period to High level, and please answer if is there any good way.
By the way, the conditions are as follows.
- Directly connected to TX of MSC-MOD20 and input pin of FPGA (Xilix Kintex 7).
- The input pin of FPGA gives the attribute of weak pull-up.
- The waveform is measured with a Tektronics oscilloscope.
- The following waveforms are observed.