Simulating restorable registers in power domain systems

An apparatus for simulating a restorable register in a power domain of an RTL (register transfer level) design, the apparatus comprising a computer for executing computer instructions, wherein the computer includes computer instructions for:

• specifying the power domain in the RTL design, wherein the power domain includes one or more registers and is configured to change power levels separately from other portions of the RTL design;
• identifying the restorable register in the power domain, wherein the restorable register is updated during power-on operations in the power domain;
• simulating the restorable register in a power cycle, wherein simulating the restorable register includes operations for:
• maintaining one or more backup values during a power-off operation for updating the restorable register after the power-off operation,
• corrupting the restorable register during the power-off operation, and
• updating the restorable register during a power-on operation after the power-off operation by using the one or more backup values;
• and
• saving one or more values from the simulated restorable register.

A computer-readable medium that stores a computer program for simulating a restorable register in a power domain of an RTL (register transfer level) design, wherein the computer program includes instructions for:

• specifying the power domain in the RTL design, wherein the power domain includes one or more registers and is configured to change power levels separately from other portions of the RTL design;
• identifying the restorable register in the power domain, wherein the restorable register is updated during power-on operations in the power domain;
• simulating the restorable register in a power cycle, wherein simulating the restorable register includes operations for:
• maintaining one or more backup values during a power-off operation for updating the restorable register after the power-off operation,
• corrupting the restorable register during the power-off operation, and
• updating the restorable register during a power-on operation after the power-off operation by using the one or more backup values;
• and
• saving one or more values from the simulated restorable register.