求助：cpld warning

tshuai

初学cpld，管脚分配后编译出现以下警告：
Warning: Ignored locations or region assignments to the following nodes
Warning: Node "KEYBOARD:inst3|inst[5]~348" is assigned to location or region, but does not exist in design
Warning: Node "KEYBOARD:inst3|inst[6]~347" is assigned to location or region, but does not exist in design
Warning: Can't place macrocell "KEYBOARD:inst3|inst[6]~303" assigned to LAB_P and node "DATA[6]" assigned to PIN_70 -- ignoring macrocell assignment
Warning: Can't place macrocell "KEYBOARD:inst3|inst[5]~310" assigned to LAB_M and node "DATA[5]" assigned to PIN_71 -- ignoring macrocell assignment
Warning: Macrocell buffer inserted after node "KEYBOARD:inst3|inst[6]~303"
Warning: Macrocell buffer inserted after node "KEYBOARD:inst3|inst[5]~310"
不明白什么意思，请那位大虾指点