Semiconductor memory having radio communication function and write control method
A radio communication processor receives first received data including first write data, a first address within a first area of a nonvolatile memory, and error detection information or second received data including second write data whose data amount is larger than a data amount of the first write data and a second address within a second area of the nonvolatile memory. If the radio communication processor receives the first received data, then a controller stores the first write data in a volatile buffer. If there is no error in the first write data, then the controller reads out the first write data from the volatile buffer and stores the first write data in the first area. If the radio communication processor receives the second received data, then the controller stores the second write data in the second area without storing the second write data in the volatile buffer.
1. A semiconductor memory having a radio communication function, comprising:
a nonvolatile memory having a first area and a second area;
a volatile storage circuit;
a radio communication processor that receives first data including first write data, a first address indicative of a write destination within the first area, and first error detection information for detecting an error in the first write data or second data including second write data whose data amount is larger than a data amount of the first write data and a second address indicative of a write destination within the second area; and
a controller that determines based on the first address or the second address which of the first data and the second data the radio communication processor has received, that stores, when the radio communication processor has received the first data, the first write data in the storage circuit, detects based on the first error detection information whether or not there is an error in the first write data, and reads out from the storage circuit the first write data in which no error has been detected to store the first write data in the first area based on the first address, and that stores, when the radio communication processor has received the second data, the second write data in the second area based on the second address without storing the second write data in the storage circuit.
2. The semiconductor memory according to claim 1 , wherein:
the second data include second error detection information for detecting an error in the second write data; and
the controller detects, after storing the second write data in the second area, based on the second error detection information whether or not there is an error in the second write data.
3. The semiconductor memory according to claim 1 , wherein:
a first data amount of the first write data is smaller than or equal to a storage capacity of the storage circuit; and
a second data amount of the second write data is larger than the storage capacity of the storage circuit.
4. The semiconductor memory according to claim 1 , wherein the second write data are image data.
5. The semiconductor memory according to claim 1 , wherein the radio communication processor generates from a radio signal including the first data or the second data an internal voltage for causing the controller to operate.
6. A write control method comprising:
receiving, by a radio communication processor, first data including first write data, a first address indicative of a write destination within a first area of a nonvolatile memory, and first error detection information for detecting an error in the first write data or second data including second write data whose data amount is larger than a data amount of the first write data and a second address indicative of a write destination within a second area of the nonvolatile memory;
determining, by a controller, based on the first address or the second address which of the first data and the second data the radio communication processor has received;
storing, by the controller, when the radio communication processor has received the first data, the first write data in a volatile storage circuit, detecting based on the first error detection information whether or not there is an error in the first write data, and reading out from the storage circuit the first write data in which no error has been detected to store the first write data in the first area based on the first address; and
storing, by the controller, when the radio communication processor has received the second data, the second write data in the second area based on the second address without storing the second write data in the storage circuit.
7. The write control method according to claim 6 , wherein:
the second data include second error detection information for detecting an error in the second write data; and
the controller detects, after storing the second write data in the second area, based on the second error detection information whether or not there is an error in the second write data.
8. The write control method according to claim 6 , wherein:
a first data amount of the first write data is smaller than or equal to a storage capacity of the storage circuit; and
a second data amount of the second write data is larger than the storage capacity of the storage circuit.
9. The write control method according to claim 6 , wherein the second write data are image data.
10. The write control method according to claim 6 , wherein the radio communication processor generates from a radio signal including the first data or the second data an internal voltage for causing the controller to operate.
11. A radio communication system comprising:
a semiconductor memory including:
a nonvolatile memory having a first area and a second area;
a volatile storage circuit;
a radio communication processor that receives first data including first write data, a first address indicative of a write destination within the first area, and first error detection information for detecting an error in the first write data or second data including second write data whose data amount is larger than a data amount of the first write data and a second address indicative of a write destination within the second area; and
a controller that determines based on the first address or the second address which of the first data and the second data the radio communication processor has received, that stores, when the radio communication processor has received the first data, the first write data in the storage circuit, detects based on the first error detection information whether or not there is an error in the first write data, and reads out from the storage circuit the first write data in which no error has been detected to store the first write data in the first area based on the first address, and that stores, when the radio communication processor has received the second data, the second write data in the second area based on the second address without storing the second write data in the storage circuit; and
a reader-writer that transmits the first data or the second data to the semiconductor memory.
12. The radio communication system according to claim 11 , wherein the reader-writer separates data to be written to the nonvolatile memory into the first write data and the second write data, assigns the first address to the first write data, assigns the second address to the second write data, and generates the first data and the second data.
13. The radio communication system according to claim 11 , wherein the reader-writer makes a first data amount of the first write data included in the first data smaller than or equal to a storage capacity of the storage circuit and makes a second data amount of the second write data included in the second data larger than the storage capacity.
14. The radio communication system according to claim 11 , further comprising:
a display device connected to the semiconductor memory,
wherein the semiconductor memory supplies to the display device setting information for the display device and image data, the setting information being the first write data, the image data being the second write data.