Patent ID: 8291211

Claim:
A portable electronic system, comprising: a first CPU core; a second CPU core; a card storage device including a nonvolatile memory having a boot code and data; a memory controller coupled to the card storage device to access the boot code in the nonvolatile memory; and a device busy state machine selecting one of the first CPU core and the second CPU core to access the nonvolatile memory of the card storage device, wherein the device busy state machine is activated by a request sent by either the first CPU core or the second CPU core in a boot operation and the device busy state machine controls either the first CPU core or the second CPU core to access the nonvolatile memory in response to the request, and wherein the first CPU core and the second CPU core are coupled to the memory controller to access the boot code, and the memory controller accesses the boot code in the card storage device through an interface having an interface protocol.