| 摘要 |
<p>A microcode patch expansion mechanism includes a patch RAM, an expansion RAM, and a controller. The patch RAM stores a first plurality of patch instructions. The first plurality is to be executed by the microprocessor in place of one or more micro instructions which are stored in a microcode ROM. The expansion RAM stores a second plurality of patch instructions. The number of the second plurality is greater than the number of the first plurality. The second plurality is to be executed by the microprocessor in place of a second one or more micro instructions which are stored in the microcode ROM. The controller executes an EXPRAM micro instruction directing that one or more of the second plurality of patch instructions be loaded into the patch RAM, and loads the one or more of the second plurality of patch instructions into the patch RAM.</p> |
