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.