LogiCORE Multiplier v8.0 - The SCLR does not reset the upper bits of a DSP48-based 35 x 18 multiplier. Why?

AR#	23591	Search For Another Answer
Topic	IP-DSP Horizontal
Last Updated	04/06/2009
Status	Active

Description

Keywords: CORE, CORE Generator, CORE Generator, coregen, large, xtremedsp, large, wide, dedicated, mult, dsp

The SCLR does not reset the upper bits of a DSP48-based 35 x 18 multiplier. Why?

Solution

This is a known bug in the reset of the Multiplier v8.0, and is fixed in Multiplier v9.0.

The way to work around this issue is to infer registers with a reset at the output of the multiplier, using HDL.