Shift Register Plugin

Translation Stage: low level ir to vhdl

This plugin implements a shift register in VHDL. The shift register is a digital circuit that can store and shift data. The plugin is parameterized by the width of the data points (DATA_WIDTH) and the number of data points to make available for reading via the outgoing line d_out.

A STRIDE generic parameter can be set. The shift register will only skip STRIDE-1 writes, but still signal ready to upstream. If you are implementing a filter with internal logic you might want to handle stride logic yourself, but for combinatorial components, you can use the following strategy.

To implement a filter with stride \(s > 1\) you set the STRIDE parameter of the succeeding shift register to \(s\). Thus, the register will store the first filter output, skip \(s-1\) outputs and repeat. While this might seem unintuitive, it is equivalent to the preceeding filter moving by \(s\) steps instead of \(1\).