VSDSP Forum

My understanding is, the VS23S040 is basically 4x VS23S010D. So the guide is still valid. There is 4 bit in a control register that selects which channel is active for read/write access (reg B7h Video&Registers Block Selection register). Memory is not shared between the channels, so the resoluti...

Thanks for the explanation. Now it all makes sense.

Thanks for confirming that there would be no difference for the software.
I have no trouble with the layout, my Arduino shield with the CS23S040 works flawlessly.

That "simple and neat" code is a handful to understand for a hardware person like me.

Hello Hannu,
Thanks for the explanation, I think it makes sense.
I am going to try this with and without added black level on my good colour monitor soon and report back.
- Wolfgang.

Hello VLSI team, I am trying to match the colour of my usable image background (default colour of all pixels) with the frame around the image (defined by the protoline). I am using NTSC 320x200 with the attached 8bit palette, which is YUV422. Palette.png And the desired colour is the dark blue, circ...

Hello Hannu,
What would be the difference between this circuit and a VS23S040 chip? Could I use the same code to access either of those?
Thanks,
- Wolfgang.

Hello Panu, Thanks for the information, as usual super helpful and gives a lot of insights into the chip. There might be a slight miss-understanding with my schematic. It is basically a dual purpose, I want to use it either as 4x composite video output, R16 and the load resistor R28 and all the comp...

Hello Panu and team, Is it possible to select more than 3 voltage levels in a protoline during the non-picture period. I understand how to create blank-level, black-level and sync-level. if I add another value, will it just create one more voltage step? E.g. 0x0000 for sync, 0x0037 for blank, 0x0042...

Challenge accepted! 8-) And it is done. https://cdn.hackaday.io/images/5481571584825012268.jpg I made a board as a Arduino Shield/Feather Wing, that should be able to output VGA or 4* Composite video. As @Panu suggested, soldering was amazingly easy. I use some low-temperature solder paste and a bo...

Hello Panu and jockm,
Very interesting discussion.
Side question to #3:
Is the PLL in the VS23S010 and VS23S040 identical? If I have a stable VGA demo (single colour or grey scale) on my VS23S010 Arduino shield, would it transfer 1-to-1 to the S040?
Thanks,
- Wolfgang.