You're right they do, just not on the lowest speed grade devices [1] [1] https://www.xilinx.com/support/documentation/data_sheets/ds160.pdf https://www.xilinx.

You're right they do, just not on the lowest speed grade devices [1] [1] https://www.xilinx.com/support/documentation/data_sheets/ds160.pdf https://www.xilinx.com/support/documentation/data_sheets/ds1...