Description:
The Rev D option will generate an SVF file that complies with revision D of the SVF standard. The SVF file standard does not support looping / status polling. In order to achieve fast erase and programming times for our Flash devices, the tool uses a status polling (looping) algorithm to see when the erase (or program) operation is done. The SVF standard does not support this.
Solution:
By default, the tool generates a "Lattice Extended" SVF file that does support looping. Since the official SVF standard does not support looping, for the Rev D option, it is necessary to use the worst-case erase and programming times defined by device specifications.