摘要:
A method of controlling an analog signal in an integrated circuit includes generating a first control signal having a first predetermined duration within the integrated circuit. The first control signal is configured to cause the analog signal to have a first signal level. The first signal level is compared to a level of a target signal. A second control signal is generated within the integrated circuit based on a result of the comparison. The second control signal is configured to cause the analog signal to have a second signal level. The second control signal has a second predetermined duration that is different than the first predetermined duration.
摘要:
The invention relates to a DLL circuit for providing an adjustable time delay of a periodic input signal, said circuit having controllable delay elements which are connected in series and form a delay chain, having a phase detector in order to generate a control signal on the basis of the periodic input signal and a periodic signal which has been delayed by the delay chain, the delay of each of the delay elements being adjusted on the basis of the control signal, and having a selection unit which is respectively connected to one of the delay elements in order to apply an output signal from one of the delay elements to an output of the DLL circuit on the basis of a selection variable which has been provided, and a compensation circuit which modifies the selection signal such that an additional delay (which is caused at least by the selection unit) between the periodic input signal and the output signal from the DLL circuit is compensated for.
摘要:
The invention relates to a semiconductor memory module having at least one memory chip and a buffer chip, which drives clock, address and command signals to the memory chip and drives data signals to, and receives them from, the memory chip via a module-internal clock, address, command and data bus. The buffer chip forms an interface to an external memory main bus. The data bus lines and/or the clock, command and address bus lines are respectively connected to the buffer chip at their two ends and are capable of being driven by the buffer chip from these two ends. Control means are being provided and set up in such a manner that they respectively match the directions of propagation of the data signals and of the clock, command and address signals on the corresponding bus lines during writing and reading.
摘要:
A calibration apparatus is provided for adjusting the relative phase between two signals received at a memory chip, the two signals being generated such that they are synchronized with one another in a controller and are transmitted to the memory chip via separate lines. The calibration apparatus comprises a measuring device, which is arranged in the memory chip and is designed for measuring the relative phase between the two received signals, and a feedback loop containing a phase-controlling correction device. The measuring device is designed for generating an item of control information indicating the deviation of the measured relative phase from a defined tolerance range. The correction device responds to the control information to compensate for the deviation. The correction device is arranged in the controller and is designed for influencing the relative phase between the two signals to be transmitted to the memory chip. The feedback loop contains a signal connection leading from the memory chip to the controller.
摘要:
A method of calibrating an output driver circuit includes providing a comparator to compare drive signals to a reference signal. The reference signal is adjusted to compensate an offset voltage of the comparator. A first drive signal is compared to the adjusted reference signal by the comparator. The first drive signal is adjusted to match the adjusted reference signal, thereby calibrating a first impedance of the output driver circuit.
摘要:
One embodiment of the invention relates to a RAM memory circuit. A memory circuit includes a multiplicity of memory cells which can be selectively addressed, I/O circuitry for data; a clock input for receiving a system clock signal; a reception sampling circuit for sampling the received data using a reception strobe signal; and a reception strobe signal generating device which internally generates the reception strobe signal with synchronization with the received system clock signal.
摘要:
A Phase shifter for generating a phase-shifted, in particular phase-delayed, output signal from an input signal is disclosed. In one embodiment, the phase shifter includes a first delay line and at least one further delay line with respectively cascaded delay elements that form a U-shaped signal path along which at least one delay element is adapted to be controlled to be optionally opening or closing. A phase discriminator located at the input side of which a clock signal and a signal from one of the delay lines can be applied, and the output side of which is connected with a respective control input of the delay elements. The clock signal can also be applied to the first delay line, so that a feedback loop is formed by the phase discriminator and at least one of the delay lines. The input signal can be applied to the delay line whose signal output is not connected with the phase discriminator, and the output signal can be output therefrom.
摘要:
The invention relates to a semiconductor memory module having a plurality of memory chips arranged in at least one row and at least one buffer chip which drives and receives clock signals and command and address signals to the memory chips and data signals to and from the memory chips via a clock, address, command and data bus inside the module and which forms an interface to an external primary memory bus. The semiconductor memory module has an even number of buffer chips arranged on it and all of the memory chips are connected to two respective buffer chips at least by one signal line type from a signal group and just to one of the two buffer chips by the remaining signal lines from the group. The sum of the electrical signal propagation times for the actuating signals via their lines from one buffer chip to a respective one of the memory chips and the electrical signal propagation times for the data signals from this memory chip to the other buffer chip during the read operation is the same for all of the memory chips, and control means for controlling the respective data write and read operation to or from the memory chips are provided in order to drive the clock signals and command and address signals in the same respective direction as the data signals via the bus inside the module when data are being written and read.
摘要:
The invention relates to a semiconductor memory module having a plurality of memory chips arranged next to one another in a row. The memory module has a module-internal clock, command/address and data bus which transfers clock signal, command and address signals and also data signals from a memory controller device to the memory chips and data signals from the memory chips to the memory controller device. The memory module has respective clock, command/address and data signal lines. The clock signal lines comprise two differential clock signal lines which, at their end opposite to the memory controller device are either open or connected to one another by a short-circuiting bridge. The memory chips, during a write operation, synchronize the write data with the clock signal running from the memory controller device to the end of the clock signal line and, during a read operation, output the read data synchronously with the clock signal reflected from the open or short-circuited end of the clock signal lines.
摘要:
One embodiment of the invention relates to a RAM memory circuit. A memory circuit includes a multiplicity of memory cells which can be selectively addressed, I/O circuitry for data; a clock input for receiving a system clock signal; a reception sampling circuit for sampling the received data using a reception strobe signal; and a reception strobe signal generating device which internally generates the reception strobe signal with synchronization with the received system clock signal.