ELECTRONIC DEVICE WITH POWER MODE CONTROL BUFFERS

摘要

An electronic device has a power control module for causing selected functional blocks to run in a low power mode of operation, while leaving other functional blocks supplied continuously with power. A power mode control distribution network includes serially connected chains of buffers in a distribution tree for distributing power mode control signals received at a common input end to respective output ends which are connected to respective functional blocks. In the low power mode of operation the power control module causes power to be supplied continuously to output buffers at the output ends of the chains while causing power supplied to other buffers to be reduced or cut-off. The output buffers include feedback paths for causing the states of the output buffers prior to the low power mode of operation to latch during the low power mode of operation.

主权项

1. An electronic device, comprising:
a plurality of functional blocks; a power control module for causing selected functional blocks to operate in a low power mode with power supply reduced or cut-off and subsequently to be restored to a full power mode, while leaving other functional blocks supplied continuously with power; and a power mode control distribution network including a plurality of serially connected chains of buffers for distributing power mode control signals received at a common input end to respective output ends that are connected to respective functional blocks; wherein in said low power mode said power control module causes power to be supplied continuously to at least output buffers at said output ends of said chains while causing power supplied to other buffers closer to said input end of said chains to be reduced or cut-off, and wherein said output buffers include feedback paths for causing the states of said output buffers prior to said low power mode to latch during said low power mode.