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Maxim claims to have the technology for gigabit signal path equalizers: http://pdfserv.maximintegrated.com/en/an/AN996.pdf http://pdfserv.maximintegrated.com/en
by vonmoltke 13y ago
Maxim claims to have the technology for gigabit signal path equalizers: http://pdfserv.maximintegrated.com/en/an/AN996.pdf http://pdfserv.maximintegrated.com/en/an/AN996.pdf
- mbell 13y agoI'm not seeing much connection between the IC being talked about in that App note and what would be needed to support DDR3.
- al2o3cr 13y agoThose are for a single serial signal - as the note indicates, mostly to replace very-short-run fiber optics. The challenges with routing DDR4 signals through connectors, etc are mostly about skew: if any signals are delayed by anything approaching 1/2 a clock period (~1cm on FR4 board) relative to each other, everything is fucked. In addition, some digging on the MAX3800 referenced there indicates that it has a power consumption of 200 mW, and a "budgetary" price of $6.90 each. Since a typical DDR interface is 100+ signals, you're looking at spending 20+ W and the price of a midrange PC just on signal integrity, and that's assuming those chips even do what you want. There are systems that work like Christine - but they are things like IBM mainframes that don't suffer from cost constraints.
- dippyskoodlez 13y agoGigabit? http://en.wikipedia.org/wiki/DDR3_SDRAM#JEDEC_standard_modules http://en.wikipedia.org/wiki/DDR3_SDRAM#JEDEC_standard_modul... Try 17GB with little latency tolerance.