Autonomous sleep mode

摘要

A system and method is disclosed that enables a peripheral or slave device to seamlessly transition in and out of sleep state while remaining completely transparent to host software. When the device is in a sleep mode and incoming data is detected, the device begins a wake-up procedure and data is routed to a first, transitional memory. The size of the transitional memory is selected such that it is capable of buffering data received during time required for the system memory to stabilize from wake-up. Once a second, extended memory is stabilized, the data is buffered from the transitional memory to the extended memory. The device resumes normal operation when its processor has initialized and can read data from the extended memory.

主权项

1. A device, comprising:
an input buffer coupled to an input from a host device; a transitional memory coupled to the input buffer, the transitional memory configured to operate while the device is in a sleep-mode power state; and an extended memory coupled to the transitional memory, the extended memory configured to receive data from the transitional memory after waking up from a sleep-mode, wherein an extended memory size is selected based upon a maximum amount of data that can be received from the transitional memory while a device processor is waking up from the sleep mode.