From: Raju Lakkaraju <raju.lakkar...@microsemi.com> Date: Mon, 3 Oct 2016 12:53:13 +0530
> From: Raju Lakkaraju <raju.lakkar...@microsemi.com> > > Edge-rate: > As system and networking speeds increase, a signal's output transition, > also know as the edge rate or slew rate (V/ns), takes on greater importance > because high-speed signals come with a price. That price is an assortment of > interference problems like ringing on the line, signal overshoot and > undershoot, extended signal settling times, crosstalk noise, transmission > line reflections, false signal detection by the receiving device and > electromagnetic interference (EMI) -- all of which can negate the potential > gains designers are seeking when they try to increase system speeds through > the use of higher performance logic devices. The fact is, faster signaling > edge rates can cause a higher level of electrical noise or other type of > interference that can actually lead to slower line speeds and lower maximum > system frequencies. This parameter allow the board designers to change the > driving strange, and thereby change the EMI behavioral. > > Edge-rate parameters (vddmac, edge-slowdown) get from Device Tree. > > Tested on Beaglebone Black with VSC 8531 PHY. > > Signed-off-by: Raju Lakkaraju <raju.lakkar...@microsemi.com> Applied, thanks.
