Semiconductor device, information control method and electronic device
A semiconductor device includes a first memory unit, a second memory unit, and a determination unit receiving a first signal permitting a write operation to one of the first memory unit and the second memory unit, and a second signal indicating whether the write operation of information to the first memory unit is finished, wherein the determination unit outputs a signal prohibiting a write operation to the second memory unit, if the second signal indicates the write operation of the information is finished.
1. A semiconductor device comprising:
a first memory unit;
a second memory unit; and
a determination unit receiving a first signal permitting a write operation to one of the first memory unit and the second memory unit, and a second signal indicating whether the write operation of information to the first memory unit is finished;
wherein the determination unit outputs a signal prohibiting a write operation to the second memory unit, if the second signal indicates the write operation of the information is finished.
2. The semiconductor device according to claim 1 , wherein the first memory unit and the second memory unit permit the write operation of the information once.
3. The semiconductor device according to claim 2 ,
wherein the first memory unit comprises a first fuse and the second memory unit comprises a second fuse, and
wherein the information is written to the first memory unit and the second memory unit, based upon one of uncoupling and coupling of one of the first fuse and the second fuse.
4. The semiconductor device according to claim 2 ,
wherein the second signal is a signal which allows the determination unit to output a signal prohibiting the write operation to the second memory unit, when a power supply voltage fails to satisfy a predetermined operating condition.
5. The semiconductor device according to claim 4 ,
wherein the first memory unit comprises a plurality of first fuses, and
wherein the second signal outputs the signal prohibiting the write operation to the second memory unit.
6. The semiconductor device according to claim 1 further comprising:
a holding unit holding the second signal at a logically determinable voltage level, in response to an initialization operation upon turning on power.
7. The method according to claim 1 ,
wherein the first memory unit comprises a calculation unit to which the second signal is input.
8. The method according to claim 1 ,
wherein the determination unit masks the first signal if the second signal indicates the write operation of the information is finished.
9. An information control method comprising:
inputting a first signal, the first signal permitting a write operation to one of a first memory unit and a second memory unit, and inputting a second signal, the second signal indicating whether the write operation of information to the first memory unit is finished;
outputting a signal prohibiting the write operation to the second memory unit, if the second signal indicates the write operation of the information to the first memory unit is finished.
10. An electric device comprising:
a first memory unit adapted to first information;
a second memory unit adapted to second information;
a circuit operating in response to second information stored in the second memory unit; and
a determination unit receiving a first signal permitting a write operation to one of the first memory unit and the second memory unit, and a second signal indicating whether the write operation of first information to the first memory unit is finished;
wherein the determination unit outputs a signal prohibiting the write operation to the second memory unit, if the second signal indicates the write operation of the first information is finished.