4 ms·
That would be problematic at best given the clock speed and timing requirements of DDR3.
by mbell 13y ago
That would be problematic at best given the clock speed and timing requirements of DDR3.
- vonmoltke 13y agoMaxim 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.