Apparatuses for reducing clock path power consumption in low power dynamic random access memory

1. An apparatus comprising:

a clock control circuit comprising:

a command/address domain configured to selectively provide a command/address clock signal based, at least in part, on a chip select signal;

a command domain circuit configured to selectively provide a command clock signal based, at least in part, on the chip select signal;

a column latency domain circuit configured to selectively provide a column latency clock signal based, at least in part, on a memory command; and

a four phase domain circuit configured to selectively provide a four phase clock signal based, at least in part, on the memory command.

2. The apparatus of claim 1 , further comprising:

a clock generation circuit configured to receive an external clock signal and to provide a first clock signal and a second clock signal to each of the command/address domain, the command domain circuit, and the column latency domain circuit based, at least in part, on the external clock, wherein the second clock signal is complementary to the first clock signal.

3. The apparatus of claim 2 , wherein the clock generation circuit is further configured to provide the four phase clock to the four phase domain circuit based, at least in part, on the external clock.

4. The apparatus of claim 2 , wherein the external clock has a first period, and the first clock signal, the second clock signal, and the four phase clock signal each have a second period that is greater than the first period.

5. The apparatus of claim 2 , wherein the command/address clock signal comprises a first command/address clock signal and a second command/address clock signal based on the first clock signal and the second clock signal;

wherein the command clock signal comprises a first command clock signal and a second command clock signal based on the first clock signal and the second clock signal; and

wherein the column latency clock signal comprises an first column latency clock signal and a second column latency clock signal based on the first clock signal and the second clock signal.

6. The apparatus of claim 1 , wherein the command domain circuit is configured to selectively provide the command clock based, at least in part, on an extended chip select signal.

7. The apparatus of claim 1 , wherein the command domain circuit is further configured to provide the command clock signal based, at least in part, on one of a write enable signal and a read enable signal.

8. A method comprising:

receiving, at a command/address domain of a clock control circuit, a first clock signal; an second clock signal, and a chip select signal;

providing, to a command/address latch, at least one of the first clock signal and the second clock signal responsive to the chip select signal being in an active state;

providing, by a chip select extension circuit of the clock control circuit, an extended chip select signal based, at least in part, on the chip select signal;

receiving, at a command domain circuit, the first clock signal, the second clock signal, and the extended chip select signal; and

providing, to a command decoder, at least one of the first clock signal and the second clock signal based, at least in part, on the extended chip select signal.

9. The method of claim 8 , further comprising:

receiving, at a column latency domain circuit of the clock control circuit, the first clock signal and the second clock signal;

providing, to a latency shifter circuit, at least one of the first clock signal and the second clock signal based, at least in part, on one of a read enable signal and a write enable signal.

10. The method of claim 9 , wherein the read enable signal and the write enable signal are provided in response to memory commands provided by the command decoder.

11. The method of claim 8 , further comprising:

receiving, at a four phase domain circuit of the clock control circuit, a four phase clock signal;

determining whether there a read burst is in progress; and

providing, to an output data buffer, the four phase clock responsive to determining that a read burst is in progress.

12. The method of claim 11 , wherein the four phase clock signal comprises four clock signals, wherein a first clock signal of the four clock signals has a phase that is offset by 90 degrees from a phase of a second clock signal of the four clock signals.

13. The method of claim 8 , wherein the chip select extension circuit extends the chip select signal by a number of cycles of at least one of the first clock signal and the second clock signal.

14. The method of claim 8 , wherein the first clock signal and the second clock signal each have a period that is two times a period of an external clock signal.

15. An apparatus comprising:

a clock signal generation circuit configured to receive an external clock signal and to provide a first internal clock signal;

a memory control circuit configured to provide at least one of a read enable signal and a write enable signal

a clock control circuit including a column latency domain circuit configured to receive the first internal clock signal and at least one of the read enable signal and the write enable signal, the column latency domain circuit further configured to provide the first internal clock signal responsive to the at least one of the read enable signal and the write enable signal.

16. The apparatus of claim 15 , wherein the column latency domain circuit comprises

a first latch configured to receive the at least one of the read enable signal and the write enable signal and to provide a first output responsive to the first internal clock signal;

a second latch configured to receive the first output and to provide a second output responsive to a second internal clock signal.

17. The apparatus of claim 16 , wherein the second internal clock signal is delayed relative to the first internal clock signal.

18. The apparatus of claim 17 , wherein the second internal clock signal is delayed by 270 degrees relative to the first internal clock signal.

19. The apparatus of claim 16 , further comprising:

a multiplexer configured to provide one of the first output and the second output responsive to a select signal.

20. The apparatus of claim 19 , further comprising:

an AND gate configured to selectively provide the first internal clock signal responsive to the multiplexer providing one of the first output and the second output.