Inline Flop Insertion/Removal Tool

[clavin-xlnx]

A tool designed to attached (and remove in a separate invocation) inline flip-flops to ports of an out-of-context DCP. This is to help routability for kernels once put in-context that will be replicated later.

[korbin]

This is very similar to what I am doing with the createGreybox function here, and if you squint, could be useful for #356.

I am using LUT1s for this purpose, though unclocked D-only or Q-only FDREs seemed to work as well, I wasn't sure which would be superior.

If using a D-only or Q-only FDRE doesn't cause Vivado to emit static GND/VCC LUTs and routes (I didn't check that closely), FDREs might be better than LUT1s.

[clavin-xlnx]

If using a D-only or Q-only FDRE doesn't cause Vivado to emit static GND/VCC LUTs and routes (I didn't check that closely), FDREs might be better than LUT1s.

In theory, it should not, but may depend on the architecture. There are inverters built into control set signal site inputs so GND doesn't have to be sourced explicitly. We went with FDREs in this case over LUT1s as they can affect the timing of the port-connected paths and by moving the FDREs farther away from the out-of-context module, potentially, you could coax greater slack out of the connection.