chipsalliance / chipsalliance/rocket-chip

nTLBBasePageSector variable mean with respect to TLB

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Scala
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Description

I am having confusion of understanding this variable in Hellacache.scala. We have
case class DcacheParams and in thar we are setting TLB parameters I am unable to understand the variable meaning
nTLBBasePageSector:Int =4
And why we are setting it to 4?
For your reference I have also attached the file snippet below
![Screenshot_2021-04-27-19-52-38](https://user-images.githubusercontent.com/54856325/116262682-2bfd0c80-a792-11eb-99d0-12d9ff85274b.png)

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