Hello,
I have heard serveral different explanations, but basically all mean the
same thing: Pre-destortion of the signal on the TX -Side (and in my
naming conventions Equalization means the equivalent on the RX side).
Sometimes I have heard De-Emphasis due to reduction of energy below the
nominal (as steve mentined), sometimes Pre-Emphasis for going above the
nominal, sometimes Pre for a Pre-Destortion before the channel.
In my "naming convention" I have a maximum energy available, and I can
only reduce this (so I'm not working with nominal, but with max.
engergy). Especially when talking about Pre-Curssor, Post-Cursor,
Boosting, Multibit Pre-Emphasis I prefer this explanation (similar to
what PCIe-Gen3 is doing).
But I have never seen any "official" explanation / description of this
names (and I would not know which consortium would define an official
naming).
I struggled with this also quite a while when working with this stuff,
and if somebody has a good explanation I'm really interested to learn
here too ..
Best Regards
Hermann
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Am 11.05.2015 um 04:55 schrieb steve weir:
It is the difference between increasing energy over the nominal, or
decreasing energy below the nominal. In each case the effect is to
predistort the transmitted data pattern to complement the channel
distortion.
Steve.
On 5/10/2015 7:30 PM, mo han wrote:
Hi experts:
I am solving the sata ISI problem by using emphasis,but I am not very clear
about the differences between de-emphasis and pre-emphasis，could anyone
tell me?
Thanks!
Mo Han
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