XBLOX may issue the following error on designs with very wide data paths.
*** XBLOX: ERROR 20224: INTERNAL ERROR Please contact Xilinx Technical Support. Please provide the following details to the support personnel. This information will be needed by the software developers. 1. representation_error(is(_529,+(*(268435455,16),15)),2, 'integer overflow')
This can be caused by having binary counters with a COUNT_TO value of greater than 31 bits. XBLOX represents this COUNT_TO value as a signed 32-bit integer; therefore, the maximum COUNT_TO value is 2^31-1.
As a workaround, cascade two half-sized COUNTERs. Although this provides a valid solution, please note that this does reduces the performance somewhat (especially in XC4000 designs), due to the break in the carry chain.