摘要:
A switching circuit for selectively coupling a first power supply to a power bus includes a first input terminal for connection to the first power supply and a means for coupling said first input terminal to a first node. A first transistor has a first source/drain region coupled to the first node and a second source/drain region coupled to the power bus. The first transistor is on in response to a first control signal applied to its gate to couple the first node to the power bus. A bias circuit is coupled to the substrate of the first transistor to prevent forward biasing of a junction between its substrate and its second source/drain region when the first transistor is on.
摘要:
Apparatus for determining the field position (00, 01, 10, 11) of an integrated circuit (18) within a reticle area (12) which contains a plurality of such integrated circuits (14-20) includes a plurality of memory cells (76, 80) formed within the integrated circuit (18) for encoding the field position. Circuitry (40, 94, 100, 104, 106) is provided for reading the states of the memory cells to ascertain the field position.
摘要:
An electrically programmable read only memory device formed in a face of a semiconductor substrate of a first conductivity type which includes a pair of spaced apart thick oxide isolation regions defining an elongated channel of the substrate therebetween. A floating gate of conductive material overlies a portion of one of the isolation regions and a first portion of the elongated channel being separated from the oxide isolation and channel regions by an insulator layer. A control layer of conductive material extends over the channel and the floating gate separated from both of the latter by an insulator layer. Buried diffused regions are located below each oxide isolation region.
摘要:
Circuits, integrated circuits, and methods are disclosed for bimodal disable circuits. In one such example method, a counter is maintained, with the counter indicating a logic level at which an output signal will be disabled during at least a portion of one of a plurality of disable cycles. The logic level indicated by the counter is transitioned. An input signal is provided as the output signal responsive to the enable signal indicating that the output signal is to be enabled, and the output signal is disabled at the logic level indicated by the counter responsive to the enable signal indicating that the output signal is to be disabled.
摘要:
An asynchronous address interface circuit and method for converting unrestricted randomly scheduled address transitions of memory address signals into scheduled address events from which initiation of a sequence of memory access events can be based. The address interface circuit initiates a delay sequence based on a address transition detection pulse. In the event a new address transition detection pulse is received prior to completion of the delay sequence, the delay sequence is reset and restarted based on the new address transition detection pulse. The sequence of memory access events is initiated in response to the completion of the delay sequence.
摘要:
A method and apparatus for flash EEPROM refresh is provided in which the control gate of a particular memory cell is read at an elevated control gate voltage (42). It is next determined whether the cell has been programmed (44). If the cell has been programmed, then the next memory cell is read (46). If it is initially determined that the cell has not been programmed (44), then the particular memory cell is read at a lowered control gate voltage (48). It is then finally determined whether the cell has been programmed (50). If it is determined that the cell has not been programmed, then the next cell is read (46). If it is determined that the cell has been programmed (50), then the memory is refreshed (52). After refresh, the next memory cell is read (46).
摘要:
A programming implementation circuit for use in programming a floating-gate, avalanche-injection, metal-oxide-semiconductor integrated-circuit memory cell. The circuit is comprised of programming control means, a decoder switching means and an enabling means. A current-limiting input voltage is transmitted by the decoder switching means to the programming control means when the circuit is placed in one state by the enabling means, causing the control means to limit current during programming. When the cicuit is placed in a second state by the enabling means, the programming control means is deactivated and the bit line of the memory circuit is connected to a sense amplifier.
摘要:
A discharge circuit for discharging bit lines of an array of semiconductor memory cells in which the array of bit lines are biased from a single bias line. The discharge circuit includes a discharge switch coupled to the bias line for discharging the bit lines and the bias line and a control circuit coupled to the discharge switch operative to turn on the discharge switch in response to the voltage on the bias line rising above a first predetermined level and then to turn off the discharge switch in response to the voltage on the bias line falling below a second predetermined level.
摘要:
An electrically programmable semiconductor memory device of a type having an array of programmable semiconductor floating gate transistors sets of which are coupled between associated respective source and drain lines, an array programming control transistor and a ground select transistor coupled to each of the drain and source lines. Each selected floating gate transistor in a programming mode is in series with control and ground select transistors between a high voltage Vpp and ground potential. A resistive element in series with a first conducting circuit element establishes a reference current which generates a voltage V.sub.1 at the junction of the resistive element and the circuit element. In a second current leg a second conducting circuit element, a module floating gate transistor biased into a conducting state and a module control transistor are all connected between Vpp and ground such that a voltage V.sub.2 is established at the junction of the second circuit element and the module floating gate transistor. Comparing means compares voltages V.sub.1 and V.sub.2 and adjusts the gate voltage V.sub.3 of the module programming control transistor so as to make the voltage V.sub.2 equal to voltage V.sub.1 and applies voltage V.sub.3 to the gates of the array programming control transistors. Since the transistor in the reference path is both electrically and geometrically the same as that in the second leg across which the voltage developed is compared, and is made by the same process, the current in the second leg will be substantially the same as that in the reference leg. Moreover, since the array floating gate transistors are also made by the same process as is the module floating gate transistor and the programming control and ground select transistors are also identical, by feeding the voltage V.sub.3 to array control transistors substantially the same current will flow through a selected array transistor as flows through both the reference current path and the second current leg.
摘要:
Various embodiments include apparatus, methods, and systems that operate to extend the processes of reading, modifying, and writing data stored in or being provided to a memory array without interrupting a continual stream of data to be written into the memory array. Embodiments may include an apparatus comprising a memory array, and an error code module coupled to the memory array with a data buffer having a plurality of data burst registers operable to receive a plurality of data bursts to be written to the memory array on a corresponding plurality of consecutive clock cycles. The error code module is operable to perform a read/modify/write process on each of the plurality of data bursts within a time period no longer than a period of two consecutive cycles of the plurality of consecutive clock cycles.