Hello,
I've got a question to understand the Frame Buffer and the DDR2-RAM interface speed. For me there is a discrepancy between the following to facts (I'm using Cyclone III Dev. Kit):
1. On page 8 in "1. Cyclone III Device Family Overview" is said:
"... DDR2 SDRAM memory interfaces support data
rates up to 400 Mbps for Cyclone III devices and 333 Mbps for Cyclone III LS devices. ..."
So does it mean that I can't read data from DDR2-RAM with more than 400Mbps?
2. So I also used the VIP-Suite. There is a Frame Buffer, which puts video data to DDR2-RAM using the DDR2 High Performance Controller. So if I have a video stream 1080p60 that means:
1920px * 1080px * 24bit (color depth) * 60Hz = 2986Mbps
And the system works.
So how could it be? Because 2986Mbps is much faster than 400Mbps... And what is the maximum data rate I can use Cyclone III + DDR2 High Performance Controller?
So, what did I get wrong?
Thanks for really every hint!
Best regards,
tonib
