Semiconductor device
View Patent ↗A semiconductor device includes a test circuit that generates a pulse signal from a timing signal. The test circuit outputs the pulse signal and a first set of address signals in response to a first type transition of the timing signal. The test circuit outputs the pulse signal and a second set of address signals in response to a second type transition of the timing signal. The second set of address signals is different from the first set of address signals.
1. A semiconductor device comprising: a test circuit that generates a pulse signal from a timing signal,
the test circuit that outputs the pulse signal and a first set of address signals in response to a first type transition of the timing signal, and
the test circuit that outputs the pulse signal and a second set of address signals in response to a second type transition of the timing signal, the second set of address signals being different from the first set of address signals,
wherein the test circuit receives the timing signal and the first set of address signals from outside the test circuit, and the timing signal is generated in accordance with a single command.
2. The semiconductor device according to claim 1 , wherein the test circuit allows the semiconductor device to perform read operations, in a parallel test mode, to read out data at the first set of address signals in response to the first type transition of the timing signal, and other data at the second set of address signals in response to the second type transition of the timing signal, the timing signal has been generated in accordance with the single command.
3. The semiconductor device according to claim 1 , wherein the single command is a single read command.
4. The semiconductor device according to claim 1 , wherein the test circuit allows the semiconductor device to perform write operations, in a parallel test mode, to write data at the first set of address signals in response to the first type transition of the timing signal, and other data at the second set of address signals in response to the second type transition of the timing signal, the timing signal has been generated in accordance with the single command.
5. The semiconductor device according to claim 1 , wherein the single command is a single write command.
6. The semiconductor device according to claim 1 , wherein the test circuit inverts at least one address signal of the first set of address signals to generate the second set of address signals.
7. The semiconductor device according to claim 1 , wherein the test circuit that generates the pulse signal in response to the first type and second type transitions of the timing signal.
8. The semiconductor device according to claim 1 , further comprising:
a memory cell array; and
a command decoding circuit coupled to the test circuit, the command decoding circuit decoding an access command to a memory area of the memory cell array to generate the timing signal, the command decoding circuit supplying the timing signal to the test circuit.
9. The semiconductor device according to claim 8 , wherein the first set of address signals selects data corresponding to the memory area.
10. The semiconductor device according to claim 8 , wherein the pulse signal indicates timings of selection to the memory cell.
11. The semiconductor device according to claim 10 , further comprising:
a memory cell array; and
a sense amplifier circuit connected to the selected column of the memory cell array,
wherein the address signal selects a column of the memory cell array for input and output of data from the selected column, and
the pulse signal activates the sense amplifier circuit.
12. The semiconductor device according to claim 1 , wherein the test circuit generates the pulse signal from the timing signal and a delay signal which is delayed from the timing signal.
13. The semiconductor device according to claim 1 , wherein the test circuit comprises:
a selecting circuit that receives the timing signal, the pulse signal, and a test mode signal that indicates that a parallel test is performed, and
the selecting circuit selects one of the timing signal and the pulse signal based on the test mode signal.
14. The semiconductor device according to claim 1 , wherein the test circuit is inactivated based a level of a test mode signal to allow the semiconductor device to perform at least one of read and write operations in a burst mode.
15. A semiconductor device comprising:
a test circuit that receives a timing signal and a first set of address signals, the timing signal being generated in accordance with a single command,
the test circuit that generates a pulse signal from the timing signal,
the test circuit that outputs the pulse signal and the first set of address signals in response to a first type transition of the timing signal,
the test circuit that outputs the pulse signal and a second set of address signals in response to a second type transition of the timing signal, the second set of address signals being different from the first set of address signals,
a memory cell array, and
a command decoding circuit coupled to the test circuit, the command decoding circuit decoding an access command to a memory area of the memory cell array to generate the timing signal, the command decoding circuit supplying the timing signal to the test circuit.
16. A semiconductor device comprising:
a test circuit that receives a timing signal and a plurality of address signals, the timing signal being generated by decoding an access command to a memory area, the plurality of address signals selecting data corresponding to the memory area,
the test circuit that generates a one-shot pulse signal from the timing signal and a delay signal in response to a transition of the timing signal, the one-shot pulse signal indicating timings of column selection, the delay signal being delayed from the timing signal,
the test circuit that outputs the one-shot pulse signal and the plurality of address signals as a column address signal at a first type transition of the timing signal, and
the test circuit that outputs the one-shot pulse signal and a set of address signals as the column address signal at a second type transition of the timing signal, the set of address signals being obtained by inverting at least one address signal of the plurality of address signals.
17. The semiconductor device according to claim 16 , wherein the test circuit comprises:
a selecting circuit that receives the timing signal, the one-shot pulse signal, and a test mode signal that indicates that a parallel test is performed, and
the selecting circuit selects one of the timing signal and the one-shot pulse signal based on the test mode signal.
18. The semiconductor device according to claim 17 , further comprising:
a memory cell array; and
a sense amplifier circuit connected to the selected column of the memory cell array,
wherein the column address signal selects a column of the memory cell array for input and output of data from the selected column, and
the one-shot pulse signal activates the sense amplifier circuit.