Flash memory express erase and program
View Patent ↗A mechanism for express storage of sensor data in response to an indication of a power fluctuation, power brownout or blackout that can affect operation of a microcontroller is provided. Embodiments provide a flash memory having memory space allocated to express storage of the sensor data, and a protocol machine configured to provide the desired information to reserved registers associated with express program/erase operations accessing the allocated memory space.
1. A memory system comprising:
a flash memory array configured to store data;
a program/erase controller coupled to the flash memory array and configured to perform a plurality of operations in conjunction with storing data in the flash memory array; and
a protocol machine coupled to the program/erase controller and configured to interrupt an operation performed by the program/erase controller in response to a vehicular event, and
instruct the program/erase controller to bypass one or more of the plurality of operations while storing selected data in the flash memory array, wherein
the vehicular event comprises an indication of an event in which insufficient power can be applied to the memory system for normal operation subsequent to the vehicular event; and
one or more reserve registers, coupled to the program/erase controller and the protocol machine, and configured to store the selected data prior to the selected data being stored in the flash memory array in response to the vehicular event.
2. The memory system of claim 1 wherein the protocol machine reads the selected data from a reserve register prior to said storing the selected data in the flash memory array.
3. The memory system of claim 1 wherein the program/erase controller is further configured to store state information corresponding to the interrupted operation upon performing said interrupting.
4. The memory system of claim 3 further comprising one or more status registers configured to store the state information corresponding to the interrupted operation.
5. The memory system of claim 4 wherein the flash memory array comprises the one or more status registers.
6. The memory system of claim 1 wherein the flash memory array comprises one or more express memory areas configured to store the selected data.
7. The memory system of claim 6 wherein the program/erase controller is configured to erase any data stored in the express memory areas in response to the vehicular event and prior to said storing the selected data.
8. The memory system of claim 1 further comprising:
a network coupled to the protocol machine; and
one or more sensors coupled to the network, wherein the indication of the event in which insufficient power can be applied to the memory system comprises data transmitted by a sensor of the one or more sensors.
9. A method for storing data associated with a vehicular event, the method comprising:
suspending memory operations in response to a signal indicative of the vehicular event, wherein the vehicular event is an event in which insufficient power can be applied to a memory system performing the memory operations subsequent to the vehicular event;
express erasing previous data from a memory location to which the data associated with the vehicular event is to be stored; and
express storing the data associated with the vehicular event in the memory location, wherein said express erasing and express storing bypass normal memory erasing and storing exception handling and readiness checking, and
said express storing comprises loading the data associated with the vehicular event from a reserve register of the one or more reserve registers to the memory location.
10. The method of claim 9 wherein said loading the data associated with the vehicular event is performed subsequent to said suspending memory operations and express erasing.
11. The method of claim 9 , wherein
the signal indicative of the vehicular event is generated in response to information received from one or more sensors in a vehicle.
12. The method of claim 11 wherein the information received is indicative of a power brownout or power blackout in the vehicle.
13. The method of claim 11 wherein the information received is indicative of a crash of the vehicle.
14. A vehicle comprising:
a microcontroller unit comprising
a processor,
a flash memory array, coupled to the processor, and configured to store data,
a program/erase controller, coupled to the flash memory array, and configured to perform a plurality of operations in conjunction with storing data in the flash memory array, and
a protocol machine, coupled to the program/erase controller, and configured to interrupt an operation performed by the program/erase controller in response to information regarding an event in the vehicle, and instruct the program/erase controller to bypass one or more of the plurality of operations while storing selected data in the flash memory array, wherein the information regarding the event comprises an indication of an event in which insufficient power can be applied to the microcontroller unit for normal operation subsequent to the event, and
one or more reserve registers, coupled to the program/erase controller and the protocol machine, and configured to store the selected data prior to the selected data being stored in the flash memory array in response to the vehicular event;
a network coupled to the microcontroller unit; and
one or more sensors, coupled to the network, and configured to transmit signals on the network to the microcontroller unit, wherein
a sensor of the one or more sensors is configured to detect the event in the vehicle and to transmit the information regarding the event to the microcontroller unit.
15. The vehicle of claim 14 , wherein a subset of the one or more sensors are configured to transmit the selected data to the microcontroller unit.
16. The vehicle of claim 15 wherein the vehicle event is when insufficient power can be applied to the microcontroller unit and the subset of the one or more sensors is configured to detect the vehicle event.
17. The vehicle of claim 16 wherein said storing the selected data is performed within a response time for the vehicle event.