08-03-2023, 06:38 PM
Thanks for all of your encouraging comments
Jeremy
The soldering iron is willing. The eyes not so much so.
Jeffrey
I haven't been this tight on pins before. Still I have one spare yet. As the TVP5150 has one that can be used as a logic port. The ones on the modulators were more convenient to use.
Stephen
Yes, I used as much of the PSC PCB as I could. No point reinventing the wheel
. I removed the FPGA, Frame store, Flash memory, PIC, JTAG connector and the 2.5V regulator from the PSC PCB.
The 2.5V regulator isn't need with the lattice FPGA. There is one pin on the iCE40HX1K that needs 2.5V. I have used a Schottky diode from the 3.3V rail to supply it. I have used the diode because any circuits that I have seen the iCE40HX1K used in, this is the way it has been done including Lattice own development boards.
That pin supplies a nonvolatile one time programmable configuration memory. It can be used instead of external flash memory when the firmware is finalised. It is of no use in this project as more than one programme image will be use.
The features this converter will have has not been finalised yet. I am still working the firmware for the FPGA and have not really started the programme for the PIC yet.
But I see them something along these lines.
The converter is a 2 line, very cut down version of what was in the earlier Hedghogs. So technically not to the same standard but still gives a good conversion.
Selectable equalising pulses
Selectable 4:3 => 4:3, 4:3 => 5:4, 16:9 => 4:3 and 16:9 => 5:4 aspect ratio conversion.
All that wont fit into a single image but from the tests I have done I should be able to spread it across 2 images.
The third image will be a 405 line test card.
This leaves the fourth image going spare.
Into this I am going to try and fit a basic 625 to 819 line converter.
Frank
Jeremy
The soldering iron is willing. The eyes not so much so.
Jeffrey
I haven't been this tight on pins before. Still I have one spare yet. As the TVP5150 has one that can be used as a logic port. The ones on the modulators were more convenient to use.
Stephen
Yes, I used as much of the PSC PCB as I could. No point reinventing the wheel
. I removed the FPGA, Frame store, Flash memory, PIC, JTAG connector and the 2.5V regulator from the PSC PCB.The 2.5V regulator isn't need with the lattice FPGA. There is one pin on the iCE40HX1K that needs 2.5V. I have used a Schottky diode from the 3.3V rail to supply it. I have used the diode because any circuits that I have seen the iCE40HX1K used in, this is the way it has been done including Lattice own development boards.
That pin supplies a nonvolatile one time programmable configuration memory. It can be used instead of external flash memory when the firmware is finalised. It is of no use in this project as more than one programme image will be use.
The features this converter will have has not been finalised yet. I am still working the firmware for the FPGA and have not really started the programme for the PIC yet.
But I see them something along these lines.
The converter is a 2 line, very cut down version of what was in the earlier Hedghogs. So technically not to the same standard but still gives a good conversion.
Selectable equalising pulses
Selectable 4:3 => 4:3, 4:3 => 5:4, 16:9 => 4:3 and 16:9 => 5:4 aspect ratio conversion.
All that wont fit into a single image but from the tests I have done I should be able to spread it across 2 images.
The third image will be a 405 line test card.
This leaves the fourth image going spare.
Into this I am going to try and fit a basic 625 to 819 line converter.
Frank
