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Floating-point adder/subtractor megafunction. The altfp_add_sub megafunction is used for floating point adder/subtractor operations. The altfp_add_sub megafunction supports the following floating point formats: single precision, double precision, and single extended precision.
и еще вот так
Resource Usage:
Family
Precision
Pipeline
Mode
Average Fmax
Resource Usage
Stratix
Single
7
Full
71.48083333
1246 lcells
Reduced
120.5933333
833 lcells
8
Full
92.79333333
1323 lcells
Reduced
120.3091667
878 lcells
Double
7
Full
61.86166667
2222 lcells
Reduced
85.39166667
1730 lcells
8
Full
72.92666667
2290 lcells
Reduced
85.13833333
1807 lcells
Stratix II
Single
7
Full
107.2583333
954 ALUTs; 478 registers
Reduced
184.2233333
682 ALUTs; 327 registers
8
Full
143.8616667
995 ALUTs; 558 registers
Reduced
185.2908333
714 ALUTs; 376 registers
Double
7
Full
99.15
1603 ALUTs; 733 registers
Reduced
139.8433333
1451 ALUTs; 580 registers
8
Full
119.82
1651 ALUTs; 846 registers
Reduced
143.3408333
1505 ALUTs; 664 registers
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