经常会有人报这样的错：MAP 不能通过， Place：645 error，
ERROR:Place:645 - A clock IOB clock component is not placed at an optimal clock
IOB site. The clock IOB component <AD9230_1_DCO_P> is placed at site
<IOB_X0Y19>. The clock IO site can use the fast path between the IO and the
Clock buffer/GCLK if the IOB is placed in the master Clock IOB Site. If this
sub optimal condition is acceptable for this design, you may use the
CLOCK_DEDICATED_ROUTE constraint in the .ucf file to demote this message to a
WARNING and allow your design to continue. However, the use of this override
is highly discouraged as it may lead to very poor timing results. It is
recommended that this error condition be corrected in the design. A list of
all the COMP.PINs used in this clock placement rule is listed below. These
examples can be used directly in the .ucf file to override this clock rule.
< NET "AD9230_1_DCO_P" CLOCK_DEDICATED_ROUTE = FALSE; > |
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