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Re: now everything clear
Posted by: hencox Oct,19.2009-20:35 

Yes, now you've confused it a bit I think. ;)

The SuperVidel has 32 physical datalines to its 2 DDR memories (16 lines to each memory chip). We run these memories at 210MHz and together with the DDR functionality (two transactions per clock cycle) this gives us 32*210M*2 = 13.44Gbit/s = 1.68Gbyte/s. This is the total datarate budget for all transactions, including screen updates and blitting to/from memory and DMA transfers to/from the ct60. So if a high resolution like 1600x1200x24bit takes 500MByte/s to update, then there's just 1.2GBytes/s left for blitting stuff. And if running dual screen output at this resolution there's just 700MBytes/s left.

The same scenario applies for the Radeon, except that it has 128 datalines to its DDR memories, and therefore 6.8 - 8 GByte/s.

/Henrik








[All messages in this thread]    [Start new thread]

Topic Posted by  Date 
I'm so confused! JoeAtari Oct,17.2009-05:06
  Re: I'm so confused! Beetle Oct,17.2009-13:13
    Re: I'm so confused! quackmore Oct,17.2009-20:25
      Not confused Nature Oct,18.2009-12:23
        now everything clear Beetle Oct,18.2009-13:11
          Re: now everything clear Beetle Oct,18.2009-13:13
          Re: now everything clear PeP Oct,18.2009-15:21
            Re: now everything clear PeP Oct,18.2009-15:23
              Re: now everything clear Beetle Oct,18.2009-16:16
            Re: now everything clear Instream Oct,18.2009-16:20
          Re: now everything clear Instream Oct,18.2009-16:34
            Re: now everything clear Beetle Oct,18.2009-21:10
              Re: now everything clear quackmore Oct,19.2009-04:43
                Re: now everything clear hencox Oct,19.2009-20:35
                  Re: now everything clear FDR1980 Oct,20.2009-01:28
                  Re: now everything clear quackmore Oct,20.2009-13:38
  Re: I'm so confused! ggn Oct,20.2009-07:50
    Re: I'm so confused! Beetle Oct,20.2009-11:38
      Re: I'm so confused! quackmore Oct,20.2009-13:51
      Re: I'm so confused! ggn Oct,21.2009-09:13
        Re: I'm so confused! Beetle Oct,21.2009-11:41
          Re: I'm so confused! Didier Méquignon Oct,21.2009-12:44
    Re: I'm so confused! Rodolphe Oct,20.2009-18:19
      Re: I'm so confused! calimero Nov,01.2009-12:34
    Re: I'm so confused! PeP Oct,20.2009-20:32


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