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PostPosted: Tue Oct 06, 2015 4:15 pm 
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Location: Gouda, The Netherlands
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If you remember, did you find your SDRAM + video interface to be the bottleneck for F(max) in your design, or was their enough bandwidth that this was not the case. Also, what video clock rates were you running? I presume 25.175 MHz?

You can find a lot of stuff in this thread, and some earlier discussions near the end of this one.

The hardware that I was working on had a CS4954 composite video chip, with 27 MHz pixel clock, with 8 bit data bus alternating between UYVY (see YUV color coding), so really only 13.5M pixels/sec. SDRAM interface was running at 100 MHz, so there was plenty of bandwidth. However, with overlapping sprites, a single pixel could require several memory reads at different addresses.

To deal with variations in sprite build time and memory delays, the video generator used a 2KB FIFO for pixel data.


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PostPosted: Tue Oct 06, 2015 6:45 pm 
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Joined: Wed Sep 23, 2015 8:14 pm
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Location: Philadelphia, PA
Arlet wrote:
You can find a lot of stuff in this thread, and some earlier discussions near the end of this one.

Thanks! Look forward to reading through the threads this evening.


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PostPosted: Fri Nov 27, 2015 8:29 pm 
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Joined: Fri Oct 30, 2015 9:49 pm
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Location: San Antonio, TX
Sounds great...

Is this a good beginners project ?
Would this be a good start learning about FPGA or does it require previous FPGA experience ?
I don't think I would have any problems wiring the components or installing the software.
Looks to me that all the software is free, is this a valid assumption ?
I just upgraded to Windows 10, does the software work with this version ?


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PostPosted: Sat Nov 28, 2015 12:40 am 
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Hi Alarmorobotics.
Yes, the projects are suitable for beginners - it is intended to give a complete walkthrough or what is needed and an introduction to FPGAs and the VHDL that is used. Everything you need to type in is included on the page, and once you become familiar with what is going on then you can experiment with what is there.
The board and programmer are nice and cheap and the software is 100% free from the official website.

It took me a while before I was brave enough to attempt FPGA experiments as it looked too expensive and complicated. Hopefully the pages will show you that it can be done cheaply and relatively easily.

I am running the software on Windows 10 (Professional) with no problems.

Have fun!

Grant.


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PostPosted: Sat Nov 28, 2015 10:39 pm 
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Location: San Antonio, TX
Howdy...

Thanks, I'll give it a try...
If I order the $30 board now, I should have it by Christmas... ;-)


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PostPosted: Thu Dec 31, 2015 9:09 pm 
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Location: San Antonio, TX
Finally got some time to play around with it...

I would like to add some external RAM but it looks like I only have 5V chips.
Need to order some that handles 3.3 V in stead.

I'll keep you updated...


Attachments:
FGPA_Setup_01.JPG
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FGPA_01.JPG [ 46.32 KiB | Viewed 1172 times ]
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PostPosted: Wed Nov 06, 2019 4:29 pm 
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Joined: Wed Jan 04, 2012 9:02 pm
Posts: 65
Hi.
I have given up with the previous web hosting - they banned me because they said I was getting too many hits and instead of throttling as they used to, they now just say I violated their T&Cs and take me down !!
So, I have now purchased my own domain (searle.wales) and put my files on a different hosting server.
Since I now have my own domain I can then put my files anywhere and move them if needed without affecting any posts such as this.

I may move some folders around a bit, so please always go to the starting page (http://searle.wales or http://www.searle.wales) and you will always get to me wherever I have moved to.

My pledge is to keep my pages online (since 1997!) so if they go offline for any reason don't worry - they will be back.

Have fun!

Grant
http://searle.wales


Last edited by zx80nut on Wed Nov 06, 2019 10:08 pm, edited 1 time in total.

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PostPosted: Wed Nov 06, 2019 4:56 pm 
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Joined: Wed Feb 13, 2013 1:38 pm
Posts: 586
Location: Michigan, USA
Thank you, Grant. Nice to see you again and hope you're doing well, Sir.

Cheerful regards, Mike McLaren


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PostPosted: Wed Nov 06, 2019 6:34 pm 
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Joined: Wed Aug 17, 2005 12:07 am
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Location: Soddy-Daisy, TN USA
Great to see you back, Grant.

Have you considered hosting your site contents (for free) on GitHub and just have a pointer directed to it from your domain? I do this with a site of mine and I literally pay $14.99 per year for the domain name and nothing else.

To my knowledge, there's no bandwidth limit but I have to admit I've never confirmed that.

_________________
Cat; the other white meat.


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PostPosted: Wed Nov 06, 2019 10:04 pm 
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Posts: 65
Hi.
I didn't realise github can host pages - interesting... always learning something new. I'll do some investigating.
The x10hosting site where I now hold my files offers unlimited traffic and seem to be a decent speed and gives an easy ftp upload so I can throw files up there easily, but anything can change as I can just point my domain (and subdomains as needed) to somewhere else. Could even host it on my Raspberry pi :-) Still getting to grips with all the options available within the domain control, so experimenting to give the best web experience.


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