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Valued Contributor III
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Altera floating point megafunction output latency

Hi! I work with Altera Cyclone IV. 

 

I have a question about altera floating point megafunctions, for example fp_add_sub or fp_mult. 

 

I can choose output latency in clock cycles, minimum is 7 or 6 respectively if mantissa width is 23 and exponent width is 8. 

 

In Xilinx Spartan 3, in floating point core I can specify output latency as low as zero or one clock cycle in same cases.  

 

The question is why Altera doesn't provide such ability, I mean it is useful to have an output faster, especially if I generate Taylor series or smth like that. 

 

 

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