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EP2C8A15F324C6N Datasheet(PDF) 47 Page - Altera Corporation |
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EP2C8A15F324C6N Datasheet(HTML) 47 Page - Altera Corporation |
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47 / 168 page  Altera Corporation 2–35 February 2007 Cyclone II Device Handbook, Volume 1 Cyclone II Architecture There is only one signa and one signb signal for each dedicated multiplier. Therefore, all of the data A inputs feeding the same dedicated multiplier must have the same sign representation. Similarly, all of the data B inputs feeding the same dedicated multiplier must have the same sign representation. The signa and signb signals can be changed dynamically to modify the sign representation of the input operands at run time. The multiplier offers full precision regardless of the sign representation and can be registered using dedicated registers located at the input register stage. Multiplier Modes Table 2–12 summarizes the different modes that the embedded multipliers can operate in. Table 2–12. Embedded Multiplier Modes Multiplier Mode Description 18-bit Multiplier An embedded multiplier can be configured to support a single 18 × 18 multiplier for operand widths up to 18 bits. All 18-bit multiplier inputs and results can be registered independently. The multiplier operands can accept signed integers, unsigned integers, or a combination of both. 9-bit Multiplier An embedded multiplier can be configured to support two 9 × 9 independent multipliers for operand widths up to 9-bits. Both 9-bit multiplier inputs and results can be registered independently. The multiplier operands can accept signed integers, unsigned integers or a combination of both. There is only one signa signal to control the sign representation of both data A inputs and one signb signal to control the sign representation of both data B inputs of the 9-bit multipliers within the same dedicated multiplier. |
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