Hi wily; New article: Intel Re-thinks Rambus
Better late than never—that was the opinion expressed by the industry last week when Intel Corp., pressured by PC OEMs and the high cost of Rambus memory, finally relented to support standard memory for the Pentium 4.
electronicnews.com
In order to assure a CAS type latency for all accesses, the SRAM attached to a DRAM would have to be the size of the DRAM. For every access that misses the SRAM, it is going to have that RAS latency. All the various schemes do is decrease the probability of the event.
Rambus is always talking about high bandwidth memory use due to lots of applications running simultaneously. But in this sort of system, the memory accesses tend to be even more scattered than usual, making the 222 vs 333 difference even more acute.
NightOwl's statement about HSDRAM merely being hi-speed SDRAM is correct, I believe. That's not the same as EDRAM, VCRAM or c.
Wow! The industry is getting a little fragged, isn't it. But the thing to remember is that the vast majority of designers are going to shoot for the mainstream memory, as it is the cheapest, most available, and (in this case) easiest to use. For designs starting now, that means DDR, possibly with ability to use straight SDRAM as well.
-- Carl |
