摘要:
DC balance encoded data is transmitted by transmitting a preamble of dummy data that is configured to provide an intermediate number of bits of a given logic value that is at least one bit of the given logic value but less than a maximum number of bits of the given logic value in the DC balance encoded data, to thereby reduce the simultaneous switching noise that is caused by transmission of a first word of DC balance encoded data. The preamble may contain one or more words of fixed and/or variable dummy data.
摘要:
A memory system and a method of reading and writing data to a memory device provide byte-by-byte write data insertion without adding extra pins or balls to the packaged device. Accordingly, the high frequency performance of the device can be improved.
摘要:
A memory system includes first and second memory devices having commonly connected data terminals and commonly connected memory control signal terminals, e.g., devices in respective first and second independently selectable memory banks that share common data lines and common memory control signal lines, such as column address strobe, row address strobe, write enable, and address signal lines. The first and second memory devices includes respective selective on-die termination (ODT) circuits configured to selectively provide first and second termination impedances at their respective data terminals responsive to a memory control signal at the commonly connected memory control signal terminals. The selective ODT circuits may produce the first termination impedance responsive to a memory write operation, and may produce the second termination impedance responsive to a memory read operation and/or expiration of a predetermined time interval following termination of the memory write operation. Preferably, the first termination impedance is less than the second termination impedance, and the selective ODT circuits provide the first termination impedance responsive to the memory write operation irrespective of which of the first and second memory devices is being written to.
摘要:
A semiconductor memory device and a power line arrangement method are disclosed. The semiconductor memory device includes a plurality of pads, each pad including an upper pad and a lower pad arranged below the upper pad, wherein pad power lines are arranged below the lower pads of the plurality of pads in a direction of crossing the pads to interconnect the pads that transmit the same level of electrical power among the plurality of pads.
摘要:
A circuit for generating a reference voltage includes a first reference voltage generating circuit disposed outside a chip and a second reference voltage generating circuit disposed inside the chip. The first and second reference voltage generating circuits output first and second reference voltages to first and second output terminals, respectively. The second reference voltage generating circuit includes at least one pull-up resistor and at least one pull-down resistor. The pull-up resistor is coupled between a first node where an internal power supply voltage is coupled and the second output terminal. The pull-down resistor is coupled between a second node and the second output terminal, wherein a voltage at the second node is relatively lower than a voltage at the first node. A third reference voltage is outputted from a node where the first output terminal is coupled to the second output terminal.
摘要:
A method for activating a word line segment of a semiconductor memory selected based on a row address provided to the memory can include activating a first word line segment selected by a row address and a command type and avoiding activating a second word line segment selected by the row address. Related devices are also disclosed.
摘要:
A method of generating a clock may use an analog synchronous mirror delay (ASMD) circuit with a duty cycle correction scheme, and an internal clock generator may use one or more of the ASMD circuits, The ASMD circuit may include a comparator with first and second input terminals that generates an output clock based on a comparison result between a signal on the first input terminal and a signal on the second input terminal, a first precharge circuit connected to the first input terminal and precharging the first input terminal, and a second precharge circuit connected to the second input terminal and precharging the second input terminal. The ASMD circuit may also include a first pair of discharge circuits discharging the first input terminal within first and second cycles of the input clock, and a second pair of discharge circuits discharging the second input terminal within first and second cycles of the input clock.
摘要:
The present invention discloses a circuit and a method for generating an internal clock signal, where the internal clock signal generation circuit includes a first delay portion for delaying an external clock signal by a first delay time, divides for dividing an output signal from the first delay portion, a first signal generator for generating a first signal with a pulse width equivalent to a skew monitor time by delaying an output signal from the divider by a second delay time and by combining the output signal from the divider with a signal delayed by the second delay time, a second signal generater for generating a second signal with a pulse width equivalent to a third delay time at a falling or rising edge of the output signal from the first delay portion, a time/digital signal converter for converting the skew monitor time equavalent to the pulse width of the first signal into first and second digital signals in response to the first signal, and a digital signal/time converter for reproducing the skew monitor time by inputting the first and the second digital signals in response to the second signal and generating the internal clock signal being delayed by a fourth delay time from the skew monitor time reproduced.
摘要:
Integrated circuit voltage generating circuits include an integrated circuit substrate, a first voltage generating circuit in the integrated substrate that is configured to generate a first voltage from a power supply voltage, and a second voltage generating circuit in the integrated circuit substrate that is configured to generate a second voltage that is different from the first voltage from the power supply voltage. A shared capacitor in the integrated circuit substrate is connected to both the first voltage generating circuit and to the second voltage generating circuit. The shared capacitor is used by the first voltage generating circuit and the second voltage generating circuit, to generate the first and second voltages.
摘要:
A clock signal control apparatus for a data output buffer that controls a data access time and an output signal maintaining time of the data output buffer based on a period of an input first clock signal. The apparatus includes a clock signal generator for generating a second clock signal having a period controlled by a period of a first clock signal, a clock signal controller and a data output buffer. The clock signal controller delays the second clock signal from the clock signal generator for a predetermined time, generates an output enable signal and a third clock signal in accordance with the second clock signal. A data output buffer receives a data signal, buffers the data signal in accordance with the third clock signal and the output enable signal from the clock signal controller, and generates an output data signal. The second clock signal has one of a plurality of periods based on the first clock signal.