Error detecting circuit and semiconductor apparatus including the same

1. An error detecting circuit of a semiconductor apparatus, comprising:

a fail detecting section configured to receive 2-bit first test data signals outputted from a first block and 2-bit second test data signals outputted from a second block, disable a first fail detection signal when the 2-bit first test data signals have different levels, disable a second fail detection signal when the 2-bit second test data signals have different levels, and disable both the first and second fail detection signals when the 2-bit first test data signals have the same level, the 2-bit second test data signals have the same level, but levels of the 2-bit first test data signals are different from levels of the 2-bit second test data signals.

2. The error detecting circuit according to claim 1 , wherein the fail detecting section enables both the first and second fail detection signals in the case where the 2-bit first test data signals have the same level, the 2-bit second test data signals have the same level, and levels of the 2-bit first test data signals are same with levels of the 2-bit second test data signals.

3. The error detecting circuit according to claim 2 , wherein the fail detecting section comprises:

a first exclusive NOR gate configured to receive the 2-bit first test data signals;

a second exclusive NOR gate configured to receive the 2-bit second test data signals;

a first AND gate configured to receive the 2-bit first and second test data signals;

a first NOR gate configured to receive the 2-bit first and second test data signals;

a second NOR gate configured to receive respective output signals of the first AND gate and the first NOR gate;

a NAND gate configured to receive respective output signals of the first and second exclusive NOR gates and an output signal of the second NOR gate;

a second AND gate configured to receive the output signal of the first exclusive NOR gate and an output signal of the NAND gate and output the first fail detection signal; and

a third AND gate configured to receive the output signal of the second exclusive NOR gate and the output signal of the NAND gate and output the second fail detection signal.

4. An error detecting circuit of a semiconductor apparatus, comprising:

a first fail detecting section configured to receive a part of test data signals among a plurality of first test data signals outputted from a first block, receive a part of test data signals among a plurality of second test data signals outputted from a second block, and generate a first fail detection signal and a second fail detection signal;

a second fail detecting section configured to receive the other part of test data signals among the plurality of first test data signals, receive the other part of test data signals among the plurality of second test data signals, and generate a third fail detection signal and a fourth fail detection signal; and

a fail determining section configured to enable a first final fail detection signal when both the first and third fail detection signals are enabled, and enable a second final fail detection signal when both the second and fourth fail detection signals are enabled.

5. The error detecting circuit according to claim 4 , wherein the first fail detecting section disables the first fail detection signal of the first and second fail detection signals when a 1-bit fail occurs in the part of test data signals among the plurality of first test data signals, disables the second fail detection signal of the first and second fail detection signals when a 1-bit fail occurs in the part of test data signals among the plurality of second test data signals, disables both the first and second fail detection signals when a 2-bit fail occurs in any one test signal among the part of test data signals of the plurality of first test data signals and the part of test data signals of the plurality of second test data signals, and enables both the first and second fail detection signals when both the part of test data signals of the plurality of first test data signals and the part of test data signals of the plurality of second test data signals are normal.

6. The error detecting circuit according to claim 5 ,

wherein the part of test data signals among the plurality of first test data signals are 2-bit test data signals,

wherein the part of test data signals among the plurality of second test data signals are 2-bit test data signals, and

wherein the first fail detecting section determines occurrence of a 1-bit fail when levels of the 2-bit test data signals among the plurality of first test data signals are different from each other, determines occurrence of a 1-bit fail when levels of the 2-bit test data signals among the plurality of second test data signals are different from each other, and determines occurrence of a 2-bit fail in the case where levels of the 2-bit test data signals among the plurality of first test data signals are the same with each other, levels of the 2-bit test data signals among the plurality of second test data signals are the same with each other, and the levels of the 2-bit test data signals among the plurality of first test data signals and the levels of the 2-bit test data signals among the plurality of second test data signals are different from each other.

7. The error detecting circuit according to claim 4 , wherein the second fail detecting section disables the third fail detection signal of the third and fourth fail detection signals when a 1-bit fail occurs in the other part of test data signals among the plurality of first test data signals, disables the fourth fail detection signal of the third and fourth fail detection signals when a 1-bit fail occurs in the other part of test data signals among the plurality of second test data signals, disables both the third and fourth fail detection signals when a 2-bit fail occurs in any one test signal among the other part of test data signals of the plurality of first test data signals and the other part of test data signals of the plurality of second test data signals, and enables both the third and fourth fail detection signals when both the other part of test data signals of the plurality of first test data signals and the other part of test data signals of the plurality of second test data signals are normal.

8. The error detecting circuit according to claim 7 ,

wherein the other part of test data signals among the plurality of first test data signals are 2-bit test data signals,

wherein the other part of test data signals among the plurality of second test data signals are 2-bit test data signals, and

wherein the second fail detecting section determines occurrence of a 1-bit fail when levels of the 2-bit test data signals among the plurality of first test data signals are different from each other, determines occurrence of a 1-bit fail when levels of the 2-bit test data signals among the plurality of second test data signals are different from each other, and determines occurrence of a 2-bit fail in the case where levels of the 2-bit test data signals among the plurality of first test data signals are the same with each other, levels of the 2-bit test data signals among the plurality of second test data signals are the same with each other, and the levels of the 2-bit test data signals among the plurality of first test data signals and the levels of the 2-bit test data signals among the plurality of second test data signals are different from each other.