What it does do is enable the DRAM to make more efficient use of that bandwidth by pipelining memory commands between banks and ranks: while one memory bank is in the process of execuring a 8n read or write burst on one memory bank, the command lines can be used to setup the next memory access on a different bank to reduce dead time on the data bus between operations. Why do DIMMs have as many ground pins as everything else combined? Signal integrity reasons: to keep the multi-Gbps IO on modern chips and board-to-board interconnects working properly, they need tons of ground pins to keep signal lines tightly coupled to ground to minimize crosstalk, transmission line impedance issues, ground bounce, etc.īTW, as for "prefetch", this is also called "burst transfer" and refers to the DRAM's ability to stream multiple words in a single read/write operation, it has absolutely nothing to do with the interface bandwidth itself. The DIMM may have 200+ pins but out of those, there are ~30 control pins, a handful of Vccio, Vcore, Vref, etc.
0 kommentar(er)
