摘要:
In a particular embodiment, a method is disclosed that includes receiving a first sense output and a second sense output of a sense amplifier at a first tri-state device coupled to a first bus, receiving the first sense output and the second sense output of the sense amplifier at a second tri-state device coupled to a second bus, and selectively activating one of the first tri-state device and the second tri-state device to drive the first bus or the second bus in response to a bus selection input.
摘要:
Die Erfindung betrifft ein Verfahren zum Testen einer Vielzahl von Wortleitungen einer Halbleiterspeicheranordnung bei einem Multiple-WL-Wafertest. Um ein Hochziehen von auf negativer Spannung liegenden inaktiven Wortleitungen (WL) beim Herunterfahren von aktiven Wortleitungen (WL) zu vermeiden, werden die inaktiven Wortleitungen kurz vor dem Herunterfahren der aktiven Wortleitungen von der negativen VNWL-Spannung abgekoppelt und hochohmig geschaltet.
摘要:
An integrated circuit memory device (10) has a current-mode data compression test mode. The memory device (10) includes a memory array having a plurality of sub-arrays (12) of memory cells. The memory cells are selected for read operations by Y-select lines (18) and word lines (16). Selected memory cells are coupled to main amplifier circuits (28) via bit lines (14), sense amplifiers (20), sub-input/output lines (22), sub-amplifier circuits (24), and main input/output lines (26). Each main amplifier circuit (28) is operable, during a normal read operation, to provide a data output (DOUT) representing a data state of a selected memory cell. During a test mode read operation, each main amplifier circuit (28) is operable to provide a data output (DOUT) representing a data state of a plurality of selected memory cells if the plurality of selected memory cells have the same data state, and to provide an error signal (ERROR) if the plurality of selected memory cells have different data states. The test mode read operation is characterized by activating a Y-select line (18) and a plurality of word lines (16) to select a plurality of memory cells that are coupled to different sub-amplifier circuits (24) that feed the same main amplifier circuit (28).
摘要:
Testing of shared memory (RAM) (10) in a multiple processor computer system is achieved by partitioning the memory (10) and allocating the memory portions to respective processors (20a-20d) in the system. Each processor (20a-20d) performs testing of its allocated memory portion simultaneously with the other processors in order to reduce the time required to complete the memory test.
摘要:
A system of Flash EEprom memory chips with controlling circuits serves as non-volatile memory such as that provided by magnetic disk drives. Improvements include the ability to remap and replace defective cells with substitute cells. The remapping is performed automatically as soon as a defective cell is detected. When the number of detects in a Flash sector becomes large, the whole sector is remapped. In one embodiment, the Flash EEprom memory is implemented on a memory card adapted to plug into a computer system. In another embodiment, the system of Flash EEPROM memory chips with controlling circuits is implemented on a memory card adapted to plug into a computer system.
摘要:
A semiconductor memory device is disclosed which has a data output circuit including a first node, a second node, first and second transistors connected in series between the first node and a potential line, third and fourth transistors connected in series between the first node and the potential line, fifth and sixth transistors connected in series between the second node and the potential line, seventh and eighth transistors connected in series between the second node and the potential line, one of the first and third transistors being driven in response to a data signal read from a selected memory cell and one of the fifth and seventh transistors being driven in response to an inverted data signal of the data signal in a normal mode while turning one of the second and fourth transistor and one of the sixth and eighth transistors ON, both of the first and third transistors being driven in response to the data signal and both of the fifth and seventh transistors being driven in response to the inverted data signal while all the second, fourth, sixth and eighth transistors ON. The output circuit further includes an output logic circuit driving an output terminal to one of first and second logic levels when the first and second nods have logic levels different from each other and to a high impedance when the first and second nodes have logic levels equal to each other.
摘要:
A system of Flash EEprom memory chips with controlling circuits serves as non-volatile memory such as that provided by magnetic disk drives. Improvements include selective multiple sector erase, in which any combinations of Flash sectors may be erased together. Selective sectors among the selected combination may also be de-selected during the erase operation. Another improvement is the ability to remap and replace defective cells with substitute cells. The remapping is performed automatically as soon as a defective cell is detected. When the number of defects in a Flash sector becomes large, the whole sector is remapped. Yet another improvement is the use of a write cache to reduce the number of writes to the Flash EEprom memory, thereby minimizing the stress to the device from undergoing too many write/erase cycling.
摘要:
A logic circuit for testing the reliability of an ASIC includes an array (42) circuit having a plurality of matrix arrays (74, 76, 78, 80) each having a plurality of inputs. The plurality of matrix arrays being positioned in a predetermined row and column of the array circuit and being responsive to a plurality of input signals applied thereto for providing a respective row and column output. A parity circuit (44) responsive to the row and column outputs of the plurality of matrix arrays for causing an output signal at an output of the logic circuit to be in a first logic state whenever the row outputs of the plurality of matrix arrays are logically different, or whenever the column outputs of the plurality of matrix arrays are logically different. A stimulus circuit (48, 50, 52) coupled to the plurality of inputs of the plurality of matrix arrays for supplying the plurality of input signals to exhaustively stimulate each one of the plurality of matrix arrays with all possible logic combinations.