Help: ICE_FLAGS_CLKDLY=N
Delays input clock by N nanoseconds for clock/data deskew
Delays the input clock by N nanoseconds (1.2ns taps) to adjust the clock
edge to the center of eye pattern on noisy or non-standard input signals.
This is usually used with CLKI to clock data on the rising edge delayed
by 1/2 wavelength + N nanoseconds. Signals that show skew between the clock
edge and data edges by the time they reach the input modules can use
this to correct the situation on PIC4/MBT4 cards. Note, the 1/2 wavelength
is applied internally when the rising edge is used. The CLKDLY=N value is
added to this.
The PIC3/MBT3 cards will clock on the rising or falling edges only
but with data/clock skew < 1 ns. These cards should not need any
correction up to their maximum sample rate of 65MHz.