On 8/25/06, Jon Smirl <[EMAIL PROTECTED]> wrote:
On Thu, 24 Aug 2006 21:18:06 -0400, Timothy Miller wrote:
> Here is a PDF of a datasheet on DDR SDRAMs that has detailed descriptions
> and timing diagrams:
>
> http://download.micron.com/pdf/datasheets/dram/ddr/256MBDDRx4x8x16.pdf
The better graphics cards all use GDDR RAM. Is it's interface
significantly different than normal DDR?
As far as I know, there are some speed and signalling advantages to
GDDR, but the expense is not worth it. With a reasonably intelligent
memory system, we can get just about the same performance out of much
cheaper DDR memories.
In the days of SGRAMS (Graphics SDRAMS, single data rate), there were
added features, including write-per-bit (planemasks loaded into the
RAM chip, not useful for 3D graphics), and block fill (solid fill at
8x rate, also not exceptionally useful to us). I'm not sure if GDDRs
retain these features.
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