eDRAM
An embedded DRAM ( eDRAM , dt. Embedded DRAM ) is a DRAM-based embedded memory , that is, the DRAM is the same , the or in the same module as the main ASIC or the main processor (embedded) integrated. In contrast to external DRAM memory modules , it is often used as a cache like transistor-based SRAM .
The embedding of the memory enables the use of wider buses and higher working speeds than external memory modules . Due to the lower space requirement, DRAM enables higher data density compared to SRAM, so potentially more memory can be used with the same die size. However, the differences in the manufacturing process between DRAM and transistor logic make integration on a die complicated, which means that more process steps are usually necessary, which increases costs. More recent research therefore relies on CMOS technology , similar to the pseudostatic RAM .
eDRAM is as L3 and L4 cache memory in IBM - mainframes and in many game consoles used, among other things, this: PlayStation 2 , PlayStation Portable , Nintendo GameCube , Wii , Wii U , Xbox 360 . It is also used in some processors of the Intel Core i series as a high-speed main memory for the integrated graphics units.
Web links
- John Poulton: An Embedded DRAM for CMOS ASICs . (English; PDF file; 121 kB)
Individual evidence
- ^ Jens Ihlenfeld: eDRAM - fast on-chip memory from IBM . golem.de, February 14, 2007, accessed on February 20, 2010.