fpga_timing

说明：  Attributes, Constraints, and Carry Logic Overview Information for Mentor Customers Schematic Syntax UCF/NCF File Syntax Attributes/Logical Constraints Placement Constraints Relative Location (RLOC) Constraints Timing Constraints Physical Constraints Relationally Placed Macros (RPM) Carry Logic in XC4000 FPGAs Carry Logic in XC5200 FPGAs
(Attributes, Constraints, and Carry Logic Overview Information for Mentor Customers Schematic Syntax UCF/NCF File Attributes Syntax/Logical Constraints Placement Constraints Relative Location (RLOC) Constraints Timing Constraints Physical Constraints Relationally Placed Macros (RPM) Carry Logic Gate FPGAs in Carry Logic in XC5200 FPGAs)