1. A method in a memory controller for power control according to a plurality of memory power modes of operation, comprising: generating power and resource control commands to correspond with one of the plurality of memory power modes of operation or to correspond with transitions between the plurality of memory power modes of operation; determining to transition from a first to a second memory power mode of operation wherein the second memory power mode of operation is a reduced memory power mode of operation; monitoring a plurality of buffers to determine if a memory access request has been received from a memory client; and determining to change from the second memory power mode of operation to the first memory power mode of operation based upon the received memory access request.