Method for testing an integrated semiconductor memory

1. A method for testing an integrated semiconductor memory, comprising:

writing a first memory state to memory cells of a memory cell array of the integrated semiconductor memory;

writing a second memory state to memory cells connected to a first word line;

generating a disturbance signal for disturbing a memory state of memory cells connected to the first word line;

low-impedance connecting the memory cells connected to the first word line to the bit line, a potential state forming on each bit line connected to one of the memory cells connected to the first word line;

simultaneously connecting the bit lines connected to one of the memory cells connected to the first word line to the common data line so that the respective potential states of the bit lines connected to one of the memory cells connected to the first word line experience a disturbance brought about by a capacitive load of a common data line;

refreshing the disturbed memory state of the memory cells connected to the first word line by assessing the respectively disturbed potential states of the bit lines;

electrically disconnecting the bit lines connected to one of the memory cells connected to the first word line from the common data line, thereby avoiding a charge equalization between the bit lines connected to one of the memory cells connected to the first word line; and

successively reading-out the respective memory state of the memory cells connected to the first word line.

2. The method for testing an integrated semiconductor memory as claimed in claim 1 , further comprising:

generating a first level of the disturbance signal on a second word line by which the selection transistors of the memory cells connected to the second word line are turned on; and

generating a second level of the disturbance signal on the second word line by which the selection transistors of the memory cells connected to the second word line are turned off.

3. The method for testing an integrated semiconductor memory as claimed in claim 2 , further comprising:

generating the first and second levels of the disturbance signal on the second word line, the second word line lying beside the first word line.

4. The method for testing an integrated semiconductor memory as claimed in claim 2 , further comprising:

generating the first and second levels of the disturbance signal on the second word line during the data retention time,

wherein in order to prevent an alteration of the memory state, a memory state written to the memory cells is refreshed at the latest after the data retention time.

5. The method for testing an integrated semiconductor memory as claimed in claim 4 , further comprising:

repeated refreshing of the memory state of the memory cells connected to the second word line, the second word line being driven with the first level of the disturbance signal during the data retention time.

6. The method for testing an integrated semiconductor memory as claimed in claim 2 , further comprising:

turning on the respective selection transistors of the memory cells connected to the first word line; and

driving sense amplifiers with a control signal such that the bit lines connected to one of the memory cells connected to the first word line are connected via the sense amplifiers simultaneously to a common data line.

7. The method for testing an integrated semiconductor memory as claimed in claim 6 , further comprising:

generating a respective first potential change on the bit lines as a result of turning on the respective selection transistors of the memory cells connected to the first word line;

generating a respective second potential change on the respective bit lines as a result of the simultaneous connection of the bit lines connected to one of the memory cells connected to the first of the word lines via the sense amplifiers to the common data line;

evaluating the respective second potential change on the respective bit line by the sense amplifier connected to the respective bit line;

writing the first memory state back to the memory cell connected via the respective bit line to the respective sense amplifier and to the first of the word lines, if the second potential change lies above the threshold value; and

writing the second memory state back to the memory cell connected via the respective bit line to the respective sense amplifier and to the first of the word lines, if the second potential change lies below the threshold value.

8. The method for testing an integrated semiconductor memory as claimed in claim 7 , further comprising:

simultaneous connecting the bit lines connected to one of the memory cells connected to the first word line via the sense amplifiers to the common data line, a delay time between turning on the respective selection transistors of the memory cells connected to the first word line and the simultaneous connection of the bit lines connected to one of the memory cells connected to the first of the word lines to the common data line, delay time provided such that the sense amplifier connected to the respective bit line detects the potential change on the respective bit line for refreshing the memory state of the memory cell connected to the respective bit line.

9. The method for testing an integrated semiconductor memory as claimed in claim 1 , further comprising:

comparing the respective memory state of the memory cells that have been read with the second memory state; and

replacing the first word line by one of the redundant word lines, if the read-out memory state of one of the memory cells connected to the first word line differs from the second memory state.

10. An integrated semiconductor memory, comprising:

a memory cell array having memory cells connected to a bit line and a word line, the memory cells being connected to the respective bit line in low-impedance fashion in an activated state and in a high-impedance fashion in a deactivated state;

a data line;

sense amplifiers connecting the bit lines to the data line; and

a control circuit activates the memory cells connected to a first word line, thereby forming a potential swing on each bit line connected to one of the activated memory cells, the control circuit simultaneously driving sense amplifiers with a control signal so that the bit lines connected to one of the activated memory cells are connected via the sense amplifiers simultaneously to the data line and subsequently isolated so that the respective potential swings of the bit lines connected to one of the activated memory cells experience a disturbance brought about by a capacitive load of the common data line, while avoiding a charge equalization between the activated memory cells by subsequent electrically decoupling of the bit lines from the common data line, and the respectively disturbed potential swings on the bit lines are assessed by the respective sense amplifiers for refreshing the respective memory cells.

11. The integrated semiconductor memory as claimed in claim 10 , wherein

the memory cells each have a selection transistor and a storage capacitor (SC),

in the activated state of the memory cell, the storage capacitor is connected to the respective bit line connected to the memory cell in low-impedance fashion via the selection transistor in a on state, and

in the deactivated state of the memory cell, the storage capacitor is connected to the respective bit line connected to the memory cell in high-impedance fashion via the selection transistor in an off state.

12. The method for testing an integrated semiconductor memory as claimed in claim 3 , further comprising:

generating the first and second levels of the disturbance signal on the second word line during the data retention time,

wherein in order to prevent an alteration of the memory state, a memory state written to the memory cells is refreshed at the latest after the data retention time.

13. The method for testing an integrated semiconductor memory as claimed in claim 12 , further comprising:

repeated refreshing of the memory state of the memory cells connected to the second word line, the second word line being driven with the first level of the disturbance signal during the data retention time.