Abstract:
The invention relates to a method and to a circuit having a memory module (1) that comprises a memory matrix (2), a column decoder (3), and a line decoder (4), the circuit of the memory module in addition comprising a validation circuit (5), wherein said validation circuit (5) is capable of reconstructing an address from selection signals and comparing this address with the original address or carrying out a plausibility test, whereupon a validation signal can be given if the addresses match or the plausibility thereof is established.
Abstract:
The present invention relates to a test system (100) interposed between a clock monitor (152) and an internal memory block (125) of a self-timed memory. In an example embodiment, the test system (100) receives an internal clock signal (104) from the clock monitor (152), an external clock signal (CL) and a control signal (CS). A multiplexer (110) of the test system provides in dependence upon the control signal (CS) the internal clock signal (104) to the internal memory block (125) during a normal mode of operation of the self-timed memory and the external clock signal (CL) to the internal memory block (125) during a test mode (108) of the self-timed memory. The test system (100) enables control of the clock cycle of the internal memory block (125) by directly applying the external clock signal (CL) during test mode. Thus, the internal memory block is stressed properly enabling the detection of small delay faults.
Abstract:
A method (300) and apparatus for testing correct operation of a page decoder in a memory is provided. In one implementation, the method includes erasing the memory (302) to reset all memory cells associated with each of the N pages in the memory, and iteratively generating a unique bit sequence of M bits (304) and programming the unique bit sequence into a plurality of the N pages (306) at a given time until each of -the N pages contains a unique bit sequence relative to other pages in the memory (308). Responsive to each of the N pages having a unique bit sequence, the method further includes using the page decoder to read out each unique bit sequence associated with the N pages to verify correct operation of the page decoder (310).
Abstract:
Verfahren zur verbesserten internen Überwachung von Adressierungsschaltungen in Halbleiterspeichern oder in einem datenverarbeitenden System, bei dem ein Abgriff von logischen Pegeln an den Adressierungsleitungen (1, 1', 1''), eine Darstellung der tatsächlich ausgewählten Adresse oder Teiladresse mittels zusätzlicher Adressbitleitungen (13), eine Rückgewinnung der tatsächlich zugegriffenen Adresse/Teiladresse mit den Adressbitleitungen (13) und ein Vergleich der tatsächlich ausgewählten Adresse/Teiladresse mit der aus den zusätzlichen Adressbitleitungen gewonnenen, anliegenden Adresse/Teiladresse zur Fehlererkennung eines Fehlers in der Adressierungsschaltung erfolgt. Die Erfindung betrifft auch einen Halbleiterspeicher und ein datenverarbeitendes System mit Hardwaremitteln, die eine Durchführung des obigen Verfahrens erlauben.
Abstract:
In a nonvolatile memory array in which a select transistor includes a charge storage element, the threshold voltage of the select transistor is monitored, and if the threshold voltage deviates from a desired threshold voltage range, charge is added to, or removed from the charge storage element to return the threshold voltage to the desired threshold voltage range.
Abstract:
Das Verfahren zum Prüfen eines Arbeitsspeichers, der eine Matrix (2) von Speicherzellen (3), einen Adressbus/-codierer und einen Schalt-/Lesekreis aufweist, besteht aus zwei Verfahrensteilen, bei dem in einem Schritt zumindest ein Teil des Adressbus/-codierers auf Adressfehler hin überprüft wird und in einem anderen Schritt zumindest ein Teil der Speicherzellen auf Zellfehler überprüft wird. Die Prüfschritte sind zeitlich unabhängig voneinander und können somit auch während des Betriebs erfolgen.
Abstract:
A semiconductor integrated circuit (FPLA) having a desired logical function achieved by arranging on a semiconductor chip variable logical circuits each having n x n (e.g., four) memory cells alternatively selected according to a combination of n (e.g., two) pairs of positive- and negative-phase signals and adapted to output positive- and negative-phase signals according to the data stored in the selected memory cell, variable wiring means provided with signal lines for interconnecting the variable logical circuits and switching elements for connecting/disconnecting signal lines intersecting each other, a wiring connection sate storage memory circuit where the states of the switching elements are stored.
Abstract:
The proposal is for a self-testing device for storage arrangements, decoders or the like for use in on-line operation, in which the word lines and/or the column lines of a storage matrix are connected to a test matrix (17). An error detector (27) generating an error signal when more than one word lines are active simultaneously is connected to the test matrix (17). As, for the most frequently occurring errors in the decoder, several word or column lines are activated, it is possible with this relatively simple and economically produced test matrix to perform a simple self-test during on-line operation.