Extended address interface activate sequence using mode register write
A method and a device is provided for implementing a mode register to transmit additional activate information to a memory device. Additional activate information may be transmitted to the memory device without increasing the tRCD time, or increasing the command/address (CA) bus pins, or adding additional circuit area, thereby reducing the impact on the performance of the memory device.
1. A device, comprising:
a mode register selected from a plurality of mode registers by using a mode register write command, wherein the mode register is configured to:
receive a command at a first clock cycle, wherein the command comprises a first portion of activate information regarding a first memory bank, wherein the first portion of the activate information is used by an activate command for activating the first memory bank at a second clock cycle, and wherein the activate command comprises a second portion of the activate information regarding the first memory bank; and
processing circuitry configured to generate the command, wherein the processing circuitry is communicatively coupled to the mode register.
2. The device of claim 1 , wherein the command comprises a mode register write command.
3. The device of claim 1 , wherein the command is generated corresponding to a 7 pin command address bus interface.
4. The device of claim 1 , wherein the first portion of the activate information comprises 8 row addresses.
5. The device of claim 1 , wherein the second portion of the activate information comprises 18 row addresses.
6. The device of claim 1 , wherein the first portion of the activate information is different from the second portion of the activate information.
7. The device of claim 1 , wherein the first portion of the activate information regarding the first memory bank is used by a second activate command for activating a second memory bank at a third clock cycle.
8. A method comprising:
receiving, by a mode register selected from a plurality of mode registers of a memory device by using a mode register write command, a command at a first clock cycle, wherein the command comprises a first portion of activate information regarding a first memory bank;
receiving, by command decoder circuitry of the memory device, an activate command for activating the first memory bank at a second clock cycle, wherein the activate command comprises a second portion of the activate information regarding the first memory bank; and
activating the first memory bank using the first portion and the second portion of the activate information regarding the first memory bank at the second clock cycle.
9. The method of claim 8 , wherein the command comprises a mode register write command.
10. The method of claim 9 , wherein the command is generated corresponding to a 7 pin command address bus interface.
11. The method of claim 8 , wherein the first portion of the activate information comprises 8 row addresses.
12. The method of claim 8 , wherein the second portion of the activate information comprises 18 row addresses.
13. The method of claim 8 , wherein the first portion of the activate information is different from the second portion of the activate information.
14. The method of claim 8 , wherein the first portion of the activate information regarding the first memory bank is used by a second activate command for activating a second memory bank at a third clock cycle.
15. A device, comprising:
a mode register configured to:
receive a first command at a first clock cycle, wherein the first command comprises a first portion of activate information regarding a first memory bank, wherein the first portion of the activate information is used by an activate command for activating the first memory bank at a second clock cycle, and wherein the activate command comprises a second portion of the activate information regarding the first memory bank; and
a pin configured to receive a signal, wherein the first command is replaced with a second command based on the signal received by the pin.
16. The device of claim 15 , wherein the first command comprises a mode register write command.
17. The device of claim 15 , wherein the second command comprises a mode register write command under testmode.
18. The device of claim 15 , wherein the first command is replaced with the second command further based on a value of a testmode control.