05-05-2017, 05:40 PM
Just a quick update.
It was getting to the point that I was going to tackle improving the interpolater but over the past few weeks I had come to the decision that I would try and use the internal memory of the FPGA and as the interpolation would be done in a different manner when using the internal memory as opposed to the frame stores now seamed a good time to make the move to the internal memory before I started on the interpolater.
I have chucked out the microcontroller and the two frame stores.
The old setup had got bushy and over grown with flying leads all over the place, so I took this opportunity to tidy things up. As the powerpad was not connected on the video decoder board that I had, I decided to build a new one and connect the powerpad. The PCB that I got made up can be split leaving the video decoder and the FIFO sections separate. Both section can work autonomously as each have there own power supplies, so now I am only using the decoder section. A crystal oscillator is providing the start up clock that the microcontroller was generating.
I have started back at basics again and have got a simple line dropper going. The results are promising. The glitches are gone and the circuit is much more stable. On the old set up switching anything (Isolation transformer, lamp, soldering iron) on or off caused the video decoder to crash. This had got progressively worse as the number of flying leads grew. Now so far at least, I cannot get it to crash no matter what is switched on or off.
Photos below of the new setup and of the line dropper.
Frank
It was getting to the point that I was going to tackle improving the interpolater but over the past few weeks I had come to the decision that I would try and use the internal memory of the FPGA and as the interpolation would be done in a different manner when using the internal memory as opposed to the frame stores now seamed a good time to make the move to the internal memory before I started on the interpolater.
I have chucked out the microcontroller and the two frame stores.
The old setup had got bushy and over grown with flying leads all over the place, so I took this opportunity to tidy things up. As the powerpad was not connected on the video decoder board that I had, I decided to build a new one and connect the powerpad. The PCB that I got made up can be split leaving the video decoder and the FIFO sections separate. Both section can work autonomously as each have there own power supplies, so now I am only using the decoder section. A crystal oscillator is providing the start up clock that the microcontroller was generating.
I have started back at basics again and have got a simple line dropper going. The results are promising. The glitches are gone and the circuit is much more stable. On the old set up switching anything (Isolation transformer, lamp, soldering iron) on or off caused the video decoder to crash. This had got progressively worse as the number of flying leads grew. Now so far at least, I cannot get it to crash no matter what is switched on or off.
Photos below of the new setup and of the line dropper.
Frank
