Add links to various docs that have been helpful

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+# DDR3-related documentation
+
+## Controllers
+
+ * [Lecture 21: Main Memory and the DRAM System - Carnegie Mellon - Comp. Arch. 2015 - Onur Mutlu](https://www.youtube.com/watch?v=IUk9o9wvX1Y)
+
+## Memory chips
+ 
+ * [A datasheet from Micron](https://www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/1gb_ddr3_sdram.pdf)
+ * [Samsung DDR3 SDRAM Specification: Device Operation & Timing Diagram](https://www.samsung.com/semiconductor/global.semi/file/resource/2017/11/ddr3_device_operation_timing_diagram_rev14-2.pdf)
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