Write driving circuit
View Patent ↗A write driving circuit is provided to drive a global input/output line to write same data to memory cells according to a combination of a first test data signal and a second test data signal in a test mode, regardless of input data signals.
1. A write driving circuit comprising:
a first operation unit configured to perform a first logic operation on a test mode signal;
a second operation unit configured to perform a second logic operation on an output signal of the first operation unit and a first test data signal;
a third operation unit configured to perform a third logic operation on the output signal of the first operation unit and a second test data signal; and
a driving unit configured to drive a global input/output line in response to an output signal of the second operation unit and an output signal of the third operation unit.
2. The write driving circuit of claim 1 , wherein the driving unit comprises:
a pull-up driver configured to perform a pull-up operation in response to an inverted signal of the output signal of the second operation unit; and
a pull-down driver configured to perform a pull-down operation in response to the output signal of the third operation unit.
3. A write driving circuit comprising:
an input buffer configured to buffer an input data signal, the input buffer being disabled in a test mode;
a latch configured to latch an output signal of the input buffer;
a serial-to-parallel converter configured to convert an output signal of the latch into parallel data signals; and
a write driver configured to drive a global input/output line in response to a first test data signal and a second test data signal in the test mode, regardless of the parallel data signals from the serial-to-parallel converter.
4. The write driving circuit of claim 3 , wherein the write driver is configured to write same data on memory cells according to a combination of the first test data signal and the second test data signal in the test mode.
5. The write driving circuit of claim 3 , wherein the write driver comprises:
an operation unit configured to perform a logic operation on a test mode signal, the first test data signal, and the second test data signal; and
a driving unit configured to drive the global input/output line in response to an output signal of the operation part.
6. The write driving circuit of claim 5 , wherein the operation unit comprises:
a first operation unit configured to perform a first logic operation on the test mode signal;
a second operation unit configured to perform a second logic operation on an output signal of the first operation unit and the first test data signal; and
a third operation unit configured to perform a third logic operation on the output signal of the first operation unit and the second test data signal.
7. The write driving circuit of claim 3 , wherein the write driver comprises:
a first operation unit configured to perform a first logic operation on a test mode signal;
a second operation unit configured to perform a second logic operation on an output signal of the first operation unit and the first test data signal;
a third operation unit configured to perform a third logic operation on the output signal of the first operation unit and the second test data signal; and
a driving unit configured to drive the global input/output line in response to an output signal of the second operation unit and an output signal of the third operation unit.
8. The write driving circuit of claim 7 , wherein the driving unit comprises:
a pull-up driver configured to perform a pull-up operation in response to an inverted signal of the output signal of the second operation unit; and
a pull-down drive unit configured to perform a pull-down operation in response to the output signal of the third operation unit.
9. A write driving circuit comprising:
an input buffer configured to buffer an input data signal;
a latch configured to latch an output signal of the input buffer;
a serial-to-parallel converter configured to convert an output signal of the latch into parallel data signals;
an input buffer controller configured to output a control signal for controlling the input buffer in response to a test mode signal; and
a write driver configured to drive a global input/output line in response to a first test data signal and a second test data signal in the test mode, regardless of the parallel data signals from the serial-to-parallel converter.
10. The write driving circuit of claim 9 , wherein the write driver is configured to write same data on memory cells according to a combination of the first test data signal and the second test data signal in the test mode.
11. The write driving circuit of claim 9 , wherein the write driver comprises:
an operation unit configured to perform a logic operation on the test mode signal, the first test data signal, and the second test data signal; and
a driving unit configured to drive the global input/output line in response to an output signal of the operation part.
12. The write driving circuit of claim 11 , wherein the operation part comprises:
a first operation unit configured to perform a first logic operation on the test mode signal;
a second operation unit configured to perform a second logic operation on an output signal of the first operation unit and the first test data signal; and
a third operation unit configured to perform a third logic operation on the output signal of the first operation unit and the second test data signal.
13. The write driving circuit of claim 9 , wherein the write driver comprises:
a first operation unit configured to perform a first logic operation on the test mode signal;
a second operation unit configured to perform a second logic operation on an output signal of the first operation unit and the first test data signal;
a third operation unit configured to perform a third logic operation on the output signal of the first operation unit and the second test data signal; and
a driving unit configured to drive the global input/output line on an output signal of the second operation unit and an output signal of the third operation unit.
14. The write driving circuit of claim 13 , wherein the driving unit comprises:
a pull-up driver configured to perform a pull-up operation in response to an inversion signal of the output signal of the second operation unit; and
a pull-down drive unit configured to perform a pull-down operation in response to the output signal of the third operation unit.
15. The write driving circuit of claim 9 , wherein the input buffer controller is configured to output a control signal for disabling the input buffer in the test mode.
16. The write driving circuit of claim 9 , wherein the input buffer controller comprises a logic unit configured to perform a logic operation in response to the test mode signal and a write enable signal.
17. The write driving circuit of claim 16 , wherein the logic unit comprises a logic device configured to perform a NAND operation in response to an inverted signal of the test mode signal and the write enable signal.