HDL Reciprocal speed limitation?

I've been looking at reciprocal function for Kintex-7 device.

Despite of various configurations I've tried on the HDL reciprocal block (pipelines, iterations), I could not get any speed faster than 215MHz for a 16-bit reciprocal.

Is this a hard limitation or there are some switches I can turn on to get faster speed?

Please advise, working with CoreGen or SysGen are bit too far from my standpoint now.

Answer 1

[Kiran Kintali]

For HDL Code Generation there are now several custom latency choices now available for divide, reciprocal and sqrt fixed-point operations .