PIDE Instruction

Hi everyone,

I need some help/information to understand/Translate a function.  I am french and i have problem to understand some technical terms.

inside a Rockwell manual concerning PIDE Instruction there is a block, (see picture attached)

I have 3 inputs, 1 output:

in1-Select Set

in2-Select cleared

in3-Select

Out1: Output

The input Select set and Select cleared means something like Latch/Unlatch ?

In this case , what is the meaning of the 3rd one Select?

There is a lot of select isn't it...that's why i'm a little bit lost.

Thanks in advance for any help