Seek clarification for the form 5498?

Seek clarification for the form 5498:

I have a Simple Ira
In the W-2 form box 12A I see an amount of xxx dollars
In the 5498 form line 9 I see an amount of yyy dollars
The amounts xxx and yyy are not same
The amount yyy is greater than xxx

Questions:
Does the amount xxx represent employee contributions
Does the amount yyy represent employer + employee contributions

Regards,
Ramesh