Semiconductor memory apparatus and operating method thereof

1. A semiconductor memory apparatus comprising:

a user setting unit configured to generate test data and a delay control signal in response to an external command and an external address;

a delay locked loop (DLL) clock generation unit comprising a replica configured to have a delay time controlled in response to the delay control signal; and

a data output unit configured to receive the test data from the user setting unit and output the test data in response to a DLL clock signal provided from the DLL clock generation unit,

wherein the user setting unit comprises:

an external signal processing unit configured to generate a mode register set mode command in response to the external command, and buffer the external address, to generate a setting address;

a mode register set configured to generate a register setting mode signal in response to the mode register set mode command; and

a setting register configured to store and output the setting address as the test data in response to the register setting mode signal, and store and output the setting address as the delay control signal.

2. The semiconductor memory apparatus according to claim 1 , wherein the DLL clock generation unit further comprises:

a delay unit configured to decide a delay time in response to a comparison signal, and delay an external clock signal by the decided delay time so as to generate the DLL clock signal; and

a phase comparison unit configured to compare the phases of the external clock signal and a feedback clock signal and generate the comparison signal,

wherein the replica is configured to decide a delay time in response to the delay control signal, delay the DLL clock signal by the decided delay time, and output the delayed signal as the feedback clock signal.

3. The semiconductor memory apparatus according to claim 1 , wherein the data output unit is configured to selectively output data which is stored in a bank or the test data in response to the register setting mode signal and the DLL clock signal.

4. The semiconductor memory apparatus according to claim 3 , wherein the data output unit is configured to output the stored data in synchronization with the DLL clock signal when the register setting mode signal is disabled, and output the test data in synchronization with the DLL clock signal when the register setting mode signal is enabled.

5. A delay locked loop (DLL), comprising:

a delay unit configured to delay an external clock signal by a set delay time, to generate the DLL clock signal;

a phase comparison unit configured to generate a comparison signal by comparing the external clock signal and a feedback clock signal based on the DLL clock signal; and

a replica configured to control a delay time of the DLL clock signal provided from an output terminal of the delay unit in response to a delay control signal, to generate the feedback clock,

wherein the delay control signal is provided from an user setting unit which is positioned outside the DLL,

wherein the user setting unit comprises:

an external signal processing unit configured to generate a mode register set mode command in response to the external command, and buffer the external address, to generate a setting address,

a mode register set configured to generate a register setting mode signal in response to the mode register set mode command; and

a setting register configured to store and output the setting address as the test data in response to the register setting mode signal, and store and output the setting address as the delay control signal.