xilinxFPGA在调用ip核时,顶层模块调用后综合成功,但是implement时,map出问题总,怎么解决ERROR:Place:1206-Thisdesigncontainsaglobalbufferinstance,,drivingthenet,,thatisdrivingthefollowing(first30)non-clocksource
xilinxFPGA在调用ip核时,顶层模块调用后综合成功,但是implement时,map出问题总,怎么解决
ERROR:Place:1206-Thisdesigncontainsaglobalbufferinstance,
,drivingthenet,,thatisdrivingthe
following(first30)non-clocksourcepinsoffchip.
Thisdesignpractice,inSpartan-6,canleadtoanunroutablesituationdue
tolimitationsintheglobalrouting.Ifthedesigndoesroutetheremaybe
excessivedelayorskewonthisnet.ItisrecommendedtouseaClock
Forwardingtechniquetocreateareliableandrepeatablelowskewsolution:
instantiateanODDR2component;tiethe.D0pintoLogic1;tiethe.D1pinto
Logic0;tietheclocknettobeforwardedto.C0;tietheinvertedclockto
.C1.Ifyouwishtooverridethisrecommendation,youmayusethe
CLOCK_DEDICATED_ROUTEconstraint(givenbelow)inthe.ucffiletodemote
thismessagetoaWARNINGandallowyourdesigntocontinue.Althoughthenet
maystillnotroute,youwillbeabletoanalyzethefailureinFPGA_Editor.
ERROR:Place:1136-Thisdesigncontainsaglobalbufferinstance,
,drivingthenet,,thatisdrivingthe
following(first30)non-clocksourcepins.
ThisisnotarecommendeddesignpracticeinSpartan-6duetolimitationsin
theglobalroutingthatmaycauseexcessivedelay,skeworunroutable
situations.ItisrecommendedtoonlyuseaBUFGresourcetodriveclock
loads.Ifyouwishtooverridethisrecommendation,youmayusethe
CLOCK_DEDICATED_ROUTEconstraint(givenbelow)inthe.ucffiletodemote
thismessagetoaWARNINGandallowyourdesigntocontinue.
ERROR:Pack:1654-Thetiming-drivenplacementphaseencounteredanerror.