Physical location constrain issue for Cyclone 10 GX ALM

Question

Hello Guys,Several carry chains are realized in my project, the device is 10CX220YF780E5. Every carry element will drive register.There isn't issue when the carry just driver single register or dual registers. However, the error will appear when I constrain dual registers together with carry into single ALM. The error information as following:The detail information is1. "Cannot place 4 nodes into a single ALM"Error(170208): Cannot place 4 nodes into a single ALM 
	Info(170017): Cannot place nodes in a single ALM -- the ALM would be illegal because ALM pins can not be routed 
	Info(170072): List of 4 nodes in the ALM 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topb|u_CarryChainDualRegInC10GX|gen[2].myffa|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y38; Region upper-right corner: X89_Y38; Sublocation: 7 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topa|u_CarryChainDualRegInC10GX|gen[2].myffb|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y38; Region upper-right corner: X89_Y38; Sublocation: 8 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topb|u_CarryChainDualRegInC10GX|gen[3].myffa|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y38; Region upper-right corner: X89_Y38; Sublocation: 10 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topa|u_CarryChainDualRegInC10GX|gen[3].myffb|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y38; Region upper-right corner: X89_Y38; Sublocation: 11 came from User Location Constraints 2. "Cannot place 6 nodes into a single ALM"Error(170208): Cannot place 6 nodes into a single ALM 
	Info(170017): Cannot place nodes in a single ALM -- the ALM would be illegal because ALM pins can not be routed 
	Info(170072): List of 6 nodes in the ALM 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topb|u_CarryChainDualRegInC10GX|gen[20].mycarry|s" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y37; Region upper-right corner: X89_Y37; Sublocation: 0 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topb|u_CarryChainDualRegInC10GX|gen[20].myffa|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y37; Region upper-right corner: X89_Y37; Sublocation: 1 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topa|u_CarryChainDualRegInC10GX|gen[20].myffb|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y37; Region upper-right corner: X89_Y37; Sublocation: 2 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topb|u_CarryChainDualRegInC10GX|gen[21].mycarry|s" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y37; Region upper-right corner: X89_Y37; Sublocation: 3 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topb|u_CarryChainDualRegInC10GX|gen[21].myffa|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y37; Region upper-right corner: X89_Y37; Sublocation: 4 came from User Location Constraints 
		Info(170000): Node "SEP_2BLKs_AD9633_CORE_|u_TDC_3Chs_Core|u0_tdc1ch_cc_dualregdualtdl|u_TDL_CC_DualReg_Topa|u_CarryChainDualRegInC10GX|gen[21].myffb|myff" 
			Info(170031): LE location constraint: Region lower-left corner: X89_Y37; Region upper-right corner: X89_Y37; Sublocation: 5 came from User Location Constraints Could anyone help me on this error?Thanks

sstrell · Answer

How are you constraining this? Remove your constraints and let the Fitter place as needed.

If you're concerned about timing, tighten your constraints in your .sdc instead of trying to force placement of resources.

minzhiwang · Answer

Hi sstrell,No, I have to constrain as that. Why cannot I constrain as that? I just want to use all 4 registers of this single ALM, then the ALUT can drives these register shortly and consistently. That's what my project requires.Thanks

sstrell · Answer

It's all based on timing.  Set your timing constraints appropriately and the Fitter will give you what you need.  You don't really need to worry too much about these low-level placement issues unless you are having trouble meeting your timing requirements.

minzhiwang · Answer

Hi sstrell,I checked the constrains carefully, this issue may be caused by conflict constraining. So it is resolved now, anyway, thanks for you respone to this thread.Thanks

richardt_altera · Answer

It seems that the issue has been resolved.Do you need any further help regarding this case?Regards,Richard Tan

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Physical location constrain issue for Cyclone 10 GX ALM

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