Vivado synthesis implements inferred Shift Registers on SRL-type resources such as:
-
SRL16E -
SRLC32E
Depending on the length of the Shift Register, Vivado synthesis does one of the following:
- Implements it on a single SRL-type primitive
- Takes advantage of the cascading capability of SRLC-type primitives
- Attempts to take advantage of this cascading capability if the rest of the design uses some intermediate positions of the Shift Register