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AR# 21677

7.1i EDK - An EDK design with a floating point unit (FPU) fails in Virtex, Virtex-E, Spartan-II and Spartan-IIE

Description

Keywords: MicroBlaze, mult18x18, multiplier

Urgency: Standard

General Description:
When targeting a Virtex, Virtex-E, Spartan-II or Spartan-IIE MicroBlaze design with an FPU NGDBuild, the following error message occurs:

ERROR:NgdBuild:604 - logical block
'microblaze_0/microblaze_0/Data_Flow_I/fpu_I1/Mul_1_1' with type 'MULT18x18S'
could not be resolved. A pin name misspelling can cause this, a missing edif
or ngc file, or the misspelling of a type name. Symbol 'MULT18x18S' is not
supported in target 'spartan2e'.
:
:

Solution

This is an oversight of the DRC, as the FPU was never intended to support FPGAs without the embedded multiplier (mult18x18).

This problem has been fixed in the latest 7.1i EDK Service Pack available at:
http://support.xilinx.com/xlnx/xil_sw_updates_home.jsp
The first service pack containing the fix is 7.1i EDK Service Pack 2.
AR# 21677
Date Created 06/27/2005
Last Updated 04/16/2007
Status Archive
Type General Article