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How to decide memory extra margin adjustment (EMA)

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hi all,

when I use artisan memory.

I don't know how to make a good decision to set memory EMA after I read the data sheet.
:roll:
ema.PNG


I don't understand it is not good when EMA is smaller than default value.

If I have a critical timing issue , may I use EMA= 000 for STA timing.
 

Re: how to decide memory extra margin adjustment (EMA)

Usually, you tapeout your chip with the default (recommended) values of margin.
If you are planning to play with EMA values on the real chip - do not connect constant values to the EMA pins, but connect them to register. So, you will be able to modify values in the silicon.

After the chip will be fabricated you can play with margin values, until the memory still works (in all possible environment conditions) on all your chips.
 

Re: how to decide memory extra margin adjustment (EMA)

Using lower than the default value will improve timing, but potentially reduce yield.
 

Re: how to decide memory extra margin adjustment (EMA)

oratie said:
Usually, you tapeout your chip with the default (recommended) values of margin.
If you are planning to play with EMA values on the real chip - do not connect constant values to the EMA pins, but connect them to register. So, you will be able to modify values in the silicon.

After the chip will be fabricated you can play with margin values, until the memory still works (in all possible environment conditions) on all your chips.
Click to expand...

This ^^^

Make sure you have a way to tune the EMA dynamically after tapeout.
 

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