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Utilizing Radio-Frequency Interconnect for a Many-DIMM DRAM System

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6 Author(s)
Therdsteerasukdi, K. ; Comput. Sci. Dept., Univ. of California, Los Angeles, CA, USA ; Gyung-Su Byun ; Ir, J. ; Reinman, G.
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The demand for capacity and off-chip bandwidth to dynamic random-access memory (DRAM) will continue to grow as we integrate more cores onto a die. However, as the data rate of DRAM has increased, the number of dual in-line memory modules (DIMMs) supported on a multi-drop bus has decreased. Therefore, traditional memory systems are not sufficient to meet both these demands. We propose the DIMM tree architecture for better scalability by connecting the DIMMs as a tree. The DIMM tree architecture is able to grow the number of DIMMs exponentially with each level of latency in the tree. We also propose application of multiband radio-frequency interconnect (MRF-I) to the DIMM tree architecture for even greater scalability and higher throughput. The DIMM tree architecture without MRF-I was able to scale up to 64 DIMMs with only an 8% degradation in throughput over an ideal system. The DIMM tree architecture with MRF-I was able to increase throughput by 68% (up to 200%) on a 64-DIMM system over a 4-DIMM system. Finally, we propose the partitioned DIMM tree, which allows the scaling of a main memory system to a many-DIMM memory system while still maintaining high throughput. The partitioned DIMM tree is able to improve throughput by an average of 19% up to 35% over the DIMM tree with 256 DIMMs on a single channel.

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Emerging and Selected Topics in Circuits and Systems, IEEE Journal on  (Volume:2 ,  Issue: 2 )