Semiconductor device and control method thereof for permitting the reception of data according to a control signal

1. A semiconductor device comprising:

a control signal generating circuit that generates a control signal that is repeatedly in an active state during periods around at least one of a sequence of rising edges and a sequence of falling edges of a clock signal and otherwise in an inactive state; and

a data input circuit that receives the control signal and is controlled to be in an activated state, in which a data signal can be received, while the control signal is in the active state, and controlled to be in a de-activated state, in which a data signal cannot be received, while the control signal is in the inactive state.

2. The semiconductor device according to claim 1 , wherein the control signal generating circuit forces the control signal to be in the active state while a delayed signal, given by delaying the clock signal by a predetermined period of time, is in a first level and forces the control signal to be in the inactive state while the delayed signal is in a second level.

3. The semiconductor device according to claim 1 , further comprising a delay circuit that generates a signal by delaying the clock signal by a predetermined period of time and outputs the delayed signal.

4. The semiconductor device according to claim 3 , wherein

the delay circuit comprises a delay line of a delay locked loop including a plurality of delay elements;

each of the plurality of the delay elements outputs a signal given by delaying the clock signal by a predetermined period of time; and

the control signal generating circuit generates the control signal by combining the signals outputted from the plurality of delay elements.

5. The semiconductor device according to claim 4 , wherein the control signal generating circuit performs an exclusive OR operation between a signal outputted from one of the plurality of the delay elements provided at a front stage of a delay element that outputs an output signal when the delay locked loop is locked and a signal outputted from one of the plurality of the delay elements provided at a rear stage of the delay element that outputs the delay signal, and forces the control signal to be in the active state while the exclusive OR is in a high level and otherwise forces the control signal to be in the inactive state.

6. The semiconductor device according to claim 4 , wherein the control signal generating circuit performs a logical AND operation between a logically inverted one of signals and the other of the signals, which are a signal outputted from one of the plurality of the delay elements provided at a front stage of a delay elements that outputs an output signal when the delay locked loop is locked and a signal outputted from one of the plurality of the delay elements provided at a rear stage of the delay element that outputs the delay signal, and forces the control signal to be in the active state while the logical AND is in a high level and otherwise forces the control signal to be in the inactive state.

7. The semiconductor device according to claim 1 , wherein the data input circuit is an amplifier circuit that amplifies the data signal and outputs the amplified data signal.

8. The semiconductor device according to claim 7 , wherein the amplifier circuit comprises at least one of a P-channel load type differential amplifier circuit, an N-channel load type differential amplifier circuit and an inverter type amplifier.

9. The semiconductor device according to claim 1 , further comprising a memory cell, wherein

the data input circuit receives a data signal for the memory cell.

10. The semiconductor device according to claim 9 , wherein the data input circuit is included in at least one of an address buffer, an input buffer and an main control circuit (clock generation circuit) and receives at least one of a row address strobe signal /RAS, a column address strobe signal /CAS, a write enable signal /WE, a clock enable signal CKE and a chip select signal /CS.

11. A semiconductor device control method, comprising:

delaying a clock signal by a predetermined period of time;

generating a control signal that is repeatedly in an active state during periods around at least one of a sequence of rising edges and a sequence of falling edges of the clock signal by referring to the delayed clock signal; and

forcing a data input circuit to be in a standby state, in which a data signal can be received, while the control signal is in the active state, and otherwise forcing the data input circuit to be in a terminated state.

12. The semiconductor device control method according to claim 11 , wherein the generating comprises forcing the control signal to be in the active state while a signal given by delaying the clock signal by a predetermined period of time is in a low level, and otherwise to be in the inactive state.

13. The semiconductor device control method according to claim 11 , wherein the generating comprises forcing the control signal to be in the active state while a signal given by delaying the clock signal by a predetermined period of time is in a high level, and otherwise to be in the inactive state.

14. The semiconductor device control method according to claim 11 , wherein the delaying comprises generating a signal by delaying the clock signal by a predetermined period of time and outputting the signal by each of a plurality of the delay elements included in a delay line of a delay locked loop; and

the generating comprises combining the signals outputted from the plurality of delay elements to generate the control signal.

15. The semiconductor device control method according to claim 14 , wherein the generating comprises:

performing an exclusive OR operation between a signal outputted from one of the plurality of the delay elements provided at a front stage of a delay elements that outputs an output signal when the delay locked loop is locked and a signal outputted from one of the plurality of the delay elements provided at a rear stage of the delay element that outputs the delay signal; and

forcing the control signal to be in the active state while the exclusive OR is in a high level, and otherwise forcing the control signal to be in the inactive state.

16. The semiconductor device control method according to claim 14 , wherein the generating comprises:

performing a logical AND operation between a logically inverted one of signals and the other of the signals, which are a signal outputted from one of the plurality of the delay elements provided at a front stage of a delay element that outputs an output signal when the delay locked loop is locked and a signal outputted from one of the plurality of the delay elements provided at a rear stage of the delay element that outputs the delay signal; and

forcing the control signal to be in the active state while the logical AND is in a high level and otherwise forcing the control signal to be in the inactive state.