3.1.4. 18 × 19 Multiplication Summed with 36-Bit Input Mode
Intel® Stratix® 10 variable precision DSP blocks support one 18 × 19 multiplication summed to a 36-bit input.
- resulta = (ax * ay) + by to sum the 18 x 19 multiplication with 36-bit input.
- resulta = (ax * ay) - by to subtract the 18 x 19 multiplication with 36-bit input.
Use the upper multiplier to provide the input for an 18 × 19 multiplication, while the bottom multiplier is bypassed. The by[17..0] and bx[35..18] signals are concatenated to produce a 36-bit input.
Use the SUB dynamic control signal to control the adder to perform addition or subtraction operation.
In this figure, the variable is defined as follows:
- n = 19 for 18 × 19 signed operands
- n = 18 for 18 × 18 unsigned operands
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