Embedded DRAM eDRAM is dynamic random-access memory DRAM integrated on the same die or multi-chip module MCM1 of an application-specific integrated circuit ASIC or microprocessor eDRAM's cost-per-bit is higher when compared to equivalent standalone DRAM chips used as external memory, but the performance advantages of placing eDRAM onto the same chip as the processor outweigh the cost disadvantages in many applications
Embedding memory on the ASIC or processor allows for much wider buses and higher operation speeds, and due to much higher density of DRAM in comparison to SRAM, larger amounts of memory can be installed on smaller chips if eDRAM is used instead of eSRAM eDRAM requires additional fab process steps compared with embedded SRAM, which raises cost, but the 3× area savings of eDRAM memory offsets the process cost when a significant amount of memory is used in the design
eDRAM memories, like all DRAM memories, require periodic refreshing of the memory cells, which adds complexity However, if the memory refresh controller is embedded along with the eDRAM memory, the remainder of the ASIC can treat the memory like a simple SRAM type such as in 1T-SRAM It is also possible to use architectural techniques to mitigate the refresh overhead in eDRAM caches2
eDRAM is used in various products, including IBM's POWER7 processor,3 Intel's Haswell CPUs with GT3e integrated graphics,4 many game consoles and other devices, such as Sony's PlayStation 2, Sony's PlayStation Portable, Nintendo's GameCube, Nintendo's Wii, Nintendo's Wii U, Apple Inc's iPhone, Microsoft's Zune HD, and Microsoft's Xbox 360
|Product name||Amount of
|Intel Haswell, Iris Pro Graphics 5200 GT3e||128 MB|
|Intel Broadwell, Iris Pro Graphics 6200 GT3e||128 MB|
|Intel Skylake, Iris Graphics 540 and 550 GT3e||64 MB|
|Intel Skylake, Iris Pro Graphics 580 GT4e||64 or 128 MB|
|PlayStation 2||4 MB|
|Xbox 360||10 MB|
|Wii U||32 MB|
Certain software utilities can model eDRAM caches5
- ^ Intel's Embedded DRAM: New Era of Cache Memory
- ^ "A Survey Of Architectural Approaches for Managing Embedded DRAM and Non-volatile On-chip Caches", Mittal et al, IEEE TPDS, 2014
- ^ "Hot Chips XXI Preview" Real World Technologies Retrieved 2009-08-17 External link in |publisher= help
- ^ "Haswell GT3e Pictured, Coming to Desktops R-SKU & Notebooks" AnandTech Retrieved 2013-10-07
- ^ 3d_cache_modeling_tool / destiny, codeornlgov, Retrieved 2015-02-26
- Day dawns for eDRAM
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