What the heck is a memory channel "CS bus"? While I was reading about memory architecture from the CMSC 22200's Lecture 17 of University of Chicago, I got stuck on determining the meaning of the word "CS" used for describing a bus as part of memory channel:



However I didn't find any additional source pointing out that bus. And furthermore, I found on different reference that:


  The memory channel is made up of a data bus and an address/comm and
  bus.


So, I don't know from where they got the information about the "CS bus"? And what is it exactly?
I think it is the "Chip Select" part which is mentioned at slide 26.

It probably selects whether to use the chip on the front or in the back.