Translation of high-level design blocks into a design specification in a hardware description language (HDL). Each block in the high-level design is assigned to a group. A set of attributes is identical between the blocks in a group. For each group of blocks, a respective set of parameters having different values on subblocks of at least two blocks in the group is determined. An HDL specification is generated for each group. The HDL specification for a group has for each parameter in the set of parameters, a parameter input.