Circuit module

A circuit module comprising:

• a power supply circuit in a first die;
• a first functional circuit unit in the first die;
• a first slave circuit in the first die and configured to receive a first command in which a first slave ID is specified and, when the received first command is a command that specifies a power mode of the first functional circuit unit, set data that specifies the power mode of the first functional circuit unit at a first power-mode setting register;
• a second functional circuit unit in a second die that differs from the first die;
• a second slave circuit in the second die and configured to receive a second command in which a second slave ID is specified and, when the received second command is a command that specifies a power mode of the second functional circuit unit, set data that specifies the power mode of the second functional circuit unit at a second power-mode setting register;
• a second sub-slave circuit in the first die and configured to receive a third command in which the second slave ID is specified and, when the received third command is a command that specifies the power mode of the second functional circuit unit, set data that specifies the power mode of the second functional circuit unit at a second power-mode setting sub-register;
• a first power-supply line in the first die and configured to transport electric power from the power supply circuit to the first functional circuit unit;
• a second power-supply line connecting the first die and the second die, and configured to transport electric power from the power supply circuit to the second functional circuit unit;
• and
• a power-supply control circuit configured to activate the power supply circuit when the first power-mode setting register or the second power-mode setting sub-register is set to an active mode,
• wherein t the active mode and a low power mode are power modes of the first functional circuit unit and the second functional circuit unit.