2.3. Pre-adder for Fixed-Point Arithmetic
Each variable precision DSP block has two 19-bit pre-adders. You can configure these pre-adders in the following configurations:
- 18-bit (signed or unsigned) addition or 18-bit (signed) subtraction for 18 x 19 mode
- 26-bit addition or subtraction for 27 x 27 mode
For 18 x 19 mode, when both pre-adders within the same DSP block are used, they must share the same operation type (either addition or subtraction).
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