Abstract:
Two different types of memory are integrated on the same type of integrated circuit. A microcontroller is associated with each of these memories. In order that the independence of operation of these microcontrollers may be ensured, they are each provided with time delay circuits whose role is to maintain the read or write operation of one microcontroller when another is selected.
Abstract:
Two different types of memory are integrated on the same type of integrated circuit. A microcontroller is associated with each of these memories. In order that the independence of operation of these microcontrollers may be ensured, they are each provided with time delay circuits whose role is to maintain the read or write operation of one microcontroller when another is selected.
Abstract:
In a device for programming EPROM-Flash type memory cells of memory words of a memory, a bit line of a memory cell of a given rank of the first word and at least one bit line of a memory cell of the same rank in a word that is horizontally adjacent to this first word are connected together to two common programming connections by means of a bias circuit, and the bias circuit comprises two bias voltage inputs and one bias voltage output. The programming method consists in the successive programming, during different programming cycles, of the different cells of this first word and, during the same programming cycle, a different cell, of the same rank, in at least one word that is different from this first word is programmed.
Abstract:
The method involves writing a word in a gp. of memory cells, selected in a line of the memory, a particular sequence is followed. Line memory cell state and values of different reference (Vref, VRH, VRB) are read. Then these readings are verified with different reference values. If no agreement is found for at least one cell of a word, this is rewritten. The desired word is written in the selected gp. of cells. Cell state reading may comprise a comparison of voltage or current of the cell with a reference, having a central (Vref), auxiliary (VRH), greater than the central, or another auxiliary (VRB), less than the central value. A word with central reference value may have its value stored in a register (REG).
Abstract:
The EEPROM includes N word lines (WL) and M bit lines (BL) in a matrix. Cells of the same group are connected to the same word line and to K distinct bit lines. First selection lines (SL1) and command lines (CL) associated with the cell groups carry selection potentials (VPP, VCC, HVH, GND) and programming and erasing or reading controls (VPP, HVN, VREAD). A p-type group selection transistor (TSG1) connects on its channel the gates of the floating gate transistors (TGF1-TGFK) of one cell group to one of the control lines. The control gate of the selection transistor is connected to one of the selection lines when the programmer wishes to program, erase or read the contents of the first group.
Abstract:
The generator includes an oscillator (3) which generates a clock signal (OSC) applied to a phase generator (2). The four outputs from the generator (ABCD) are applied to a bank of series capacitors (1) which generate a negative voltage. The generator is provided with a limiting circuit (4) which receives the negative voltage on an input (5) and generates a logic signal (ON) function of the voltage value. The circuit includes a comparator and a capacitor bridge which compares the voltage value with a reference value.
Abstract:
The method involves writing a word in a gp. of memory cells, selected in a line of the memory, a particular sequence is followed. Line memory cell state and values of different reference (Vref, VRH, VRB) are read. Then these readings are verified with different reference values. If no agreement is found for at least one cell of a word, this is rewritten. The desired word is written in the selected gp. of cells. Cell state reading may comprise a comparison of voltage or current of the cell with a reference, having a central (Vref), auxiliary (VRH), greater than the central, or another auxiliary (VRB), less than the central value. A word with central reference value may have its value stored in a register (REG).
Abstract:
The circuit includes a detection module (1) and two timing circuits (3,4). The first timing circuit receives an initialisation signal (init) and a page writing signal (ECRP). It generates at its output a bit signal which indicates whether the timing operation has finished. The second timing circuit (4) is connected to the first circuit while its output controls the memory page writing.