Semiconductor memory device and memory system
A semiconductor memory device according to an embodiment includes a first storage circuit. The first storage circuit is configured to store a first unique number uniquely assigned, and a first chip address having a bit number smaller than that of the first unique number and used to identify the semiconductor memory device from other semiconductor memory devices.
1. A semiconductor memory device comprising:
a NAND string;
a first storage circuit configured to store:
a first unique number uniquely assigned; and
a first chip address having a bit number smaller than that of the first unique number and used to identify the semiconductor memory device from other semiconductor memory devices; and
a first determination circuit configured to externally receive a first command set including a second unique number and a second chip address, and to write the second chip address to the first storage circuit as the first chip address when the second unique number matches the first unique number.
2. The semiconductor memory device according to claim 1 , further comprising:
a controller; and
a second determination circuit configured to externally receive a second command set including a third chip address, and to cause the controller to execute a command included in the second command set when the third chip address matches the first chip address.
3. The semiconductor memory device according to claim 1 , wherein the device is enabled when a first signal is externally received.
4. The semiconductor memory device according to claim 2 , further comprising:
a first register,
wherein the controller is configured to:
read the first unique number from the first storage circuit upon receiving a first command; and
store the read first unique number in the first register.
5. The semiconductor memory device according to claim 4 , wherein the first determination circuit is configured to determine whether the first unique number and the second unique number match using the first unique number stored in the first register.
6. The semiconductor memory device according to claim 1 , wherein a first command set includes a second command, the second unique number, a third command, and the second chip address in this order.
7. The semiconductor memory device according to claim 2 , further comprising:
a second register,
wherein the controller is configured to:
read the first chip address from the first storage circuit upon receiving a fourth command; and
store the read first chip address in the second register.
8. The semiconductor memory device according to claim 7 , wherein the controller is configured to delay a timing of executing an operation after storing the read first chip address in accordance with the second chip address.
9. The semiconductor memory device according to claim 7 , wherein the second determination circuit is configured to determine whether the first chip address and the second chip address match using the first chip address stored in the second register.
10. The semiconductor memory device according to claim 2 , wherein the controller is configured to externally receive a first signal toggling a plurality of times, and to change a second signal from a first state to a second state when the first signal toggles the first unique number of times.
11. A memory system, comprising:
a first package comprising memory chips including a first memory chip and a second memory chip;
a controller configured to control the first package; and
a bus that electrically connects the controller to the first package,
wherein:
the first memory chip and the second memory chip are obliquely stacked,
the first memory chip and the second memory chip each have a plurality of pads, and the pads of the first memory chip are connected to the pads of the second memory chip, respectively,
the first memory chip and the second memory chip each have a first unique number that is uniquely assigned to each of the memory chips and a first chip address having a bit number smaller than that of the first unique number and used to identify one of the memory chips from other memory chips,
the controller is configured to supply a first command set that includes a second unique number and a second chip address to the memory chips, and
the first memory chip and the second memory chip each store the second chip address as the first chip address when the second unique number matches the first unique number.
12. The memory system according to claim 11 , wherein the first memory chip and the second memory chip each control an operation timing based on the first chip address.
13. The memory system according to claim 11 , further comprising:
a second package comprising a third memory chip and a fourth memory chip,
wherein:
the third memory chip and the fourth memory chip each have a plurality of pads, and the pads of the first to fourth memory chips are connected in common to each other, and
the third memory chip and the fourth memory chip each have a first unique number that is uniquely assigned to each of the memory chips and the third and fourth memory chips and a first chip address having a bit number smaller than that of the first unique number and used to identify one of the memory chips and the third and fourth memory chips from other memory chips.
14. A memory system, comprising:
a first package comprising memory chips including a first memory chip and a second memory chip;
a controller configured to control the first package; and
a bus that electrically connects the controller to the first package,
wherein:
the first memory chip and the second memory chip each have a plurality of pads, and the pads of the first memory chip are connected to the pads of the second memory chip, respectively,
the first memory chip and the second memory chip each have a first unique number that is uniquely assigned to each of the memory chips and a first chip address having a bit number smaller than that of the first unique number and used to identify one of the memory chips from other memory chips,
the controller supplies a second command set that includes a third chip address and a command to the memory chips, and
each of the memory chips executes the command when the third chip address matches the first chip address.