Placing the SPI registers into the IOB makes timing closure more reliable. Original-commit: 6c25d54c34f0cc4612d5c9d27e0cbd90ff248795
Co-authored-by: Martin Braun <martin.braun@ettus.com> Co-authored-by: Wade Fife <wade.fife@ni.com> Co-authored-by: Ryan Marlow <ryan@lmarlow.com> Original-commit: 596760a12e4834e47589c12f8a4fd083aa2f7c25