Some Xilinx FPGA configuration options can result in the startup
sequence extending past the end of the FPGA bitstream. Continue applying
CCLK clock cycles for 8 cycles after DONE is asserted in order to ensure
the startup sequence is complete, as recommended by Xilinx.
Signed-off-by: Robert Hancock <hancock@sedsystems.ca>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>