Forum Discussion
Altera_Forum
Honored Contributor
Honored ContributorVideo Clocked output and VGA
Hi all. I am using a DE2 , and I am trying to show RGB test pattern generator on the VGA. I am using vip to genereate the colour bars, but i have not benn able to fully understand the way VCO wo...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- well, did you take a look here http://www.altera.com/literature/an/an427.pdf ? remember that in de2 sdram controller works fine @50 MHz, not over. Other sdram controllers work up to 100Mhz only in newest stratix IV fbga.. --- Quote End --- thanks for the documentation.. actually i use the 108MHz clock because i refer it from the de2_70_tv design example. (im using de2-70 board).. but in that design it use a custom verilog design sdram controller with 2 wr and 2 read port. Mybe the 108MHz clock wont work on sdram controller IP provided .. I'll try change it to 50Mhz and see what it does. how about the 27Mhz clock for test pattern gen & VGA.. i think it should work rite. because without the framebuffer & sdram added. they work just fine with 27Mhz clock.
