摘要:
Provided are a circuit and method for sampling a valid command using a valid address window extended for a high-speed operation in a double pumped address scheme memory device. A method for extending the valid address window includes: inputting a valid command signal and a first address signal at the first cycle of a clock signal; inputting a second address signal at the second cycle of the clock signal; generating a decoded command signal and extended first and second internal address signals respectively in response to the command signal and the address signals; and latching and decoding the extended first and second internal address signals in response to the decoded command signal.
摘要:
Provided is a semiconductor device capable of controlling an on-die-termination (ODT) circuit and an off-chip-driver (OCD) circuit and a control method used by the semiconductor device. The semiconductor device includes a control code generation unit generating a control code in response to a control signal, an addition unit adding an adjustment code to the control code to produce an adjusted control code, and an ODT circuit, wherein an impedance of the ODT circuit is adjusted in response to the adjusted control code. The semiconductor device can adjust the control code more precisely by adding or subtracting the adjustment code to or from the control code. Accordingly, the impedance of an OCD circuit or ODT circuit can be adjusted more precisely.
摘要:
We describe an input buffer having a stabilized operating point and an associated method. An input buffer may include a first differential amplifying unit to generate a first output signal having a first operating point and a second differential amplifying unit to generate a second output signal having a second operating point. An output control circuit varies respective weights of the first and second output signals responsive to an output control signal. The first differential amplifying unit may operate responsive to a reference voltage and an input voltage signal. The second differential amplifying unit may operate responsive to the reference voltage and the input voltage signal. The first operating point may be relatively higher than the second operating point.
摘要:
An output data strobe signal generating method and a memory system that includes a plurality of semiconductor memory devices, and a memory controller for controlling the semiconductor memory devices, wherein the memory controller provides a command signal and a chip selecting signal to the semiconductor memory devices. One or more of the semiconductor memory devices may detect a read command and a dummy read command in response to the command signal and the chip selecting signal and generate one or more preamble signals based on a calculated preamble cycle number.
摘要:
A circuit for eliminating a skew between data and a clock signal in an interface between a semiconductor memory device and a memory controller includes an edge information storage unit which stores edge information output from the semiconductor memory device, a pseudo data pattern generating unit which outputs pseudo data including a pattern similar to actually transmitted data, a phase detecting unit which receives the edge information from the edge information storage unit and the pseudo data from the pseudo data pattern generating unit to detect a phase difference between the data and the clock signal and generate a corresponding detection result, and a phase control unit which controls a phase of the clock signal according to the corresponding detection result from the phase detecting unit, so as to eliminate a per-data input/output pin skew in a data write and read operation of the semiconductor memory device.
摘要:
A circuit for eliminating a skew between data and a clock signal in an interface between a semiconductor memory device and a memory controller includes an edge information storage unit which stores edge information output from the semiconductor memory device, a pseudo data pattern generating unit which outputs pseudo data including a pattern similar to actually transmitted data, a phase detecting unit which receives the edge information from the edge information storage unit and the pseudo data from the pseudo data pattern generating unit to detect a phase difference between the data and the clock signal and generate a corresponding detection result, and a phase control unit which controls a phase of the clock signal according to the corresponding detection result from the phase detecting unit, so as to eliminate a per-data input/output pin skew in a data write and read operation of the semiconductor memory device.
摘要:
A circuit for eliminating a skew between data and a clock signal in an interface between a semiconductor memory device and a memory controller includes an edge information storage unit which stores edge information output from the semiconductor memory device, a pseudo data pattern generating unit which outputs pseudo data including a pattern similar to actually transmitted data, a phase detecting unit which receives the edge information from the edge information storage unit and the pseudo data from the pseudo data pattern generating unit to detect a phase difference between the data and the clock signal and generate a corresponding detection result, and a phase control unit which controls a phase of the clock signal according to the corresponding detection result from the phase detecting unit, so as to eliminate a per-data input/output pin skew in a data write and read operation of the semiconductor memory device.
摘要:
An output data strobe signal generating method and a memory system that includes a plurality of semiconductor memory devices, and a memory controller for controlling the semiconductor memory devices, wherein the memory controller provides a command signal and a chip selecting signal to the semiconductor memory devices. One or more of the semiconductor memory devices may detect a read command and a dummy read command in response to the command signal and the chip selecting signal and generate one or more preamble signals based on a calculated preamble cycle number.
摘要:
An output data strobe signal generating method and a memory system that includes a plurality of semiconductor memory devices, and a memory controller for controlling the semiconductor memory devices, wherein the memory controller provides a command signal and a chip selecting signal to the semiconductor memory devices. One or more of the semiconductor memory devices may detect a read command and a dummy read command in response to the command signal and the chip selecting signal and generate one or more preamble signals based on a calculated preamble cycle number.
摘要:
An input latency control circuit, a semiconductor memory device including an input latency control circuit and method thereof are provided. The example semiconductor memory device may include a clock buffer configured to generate an internal clock signal based on an external clock signal, a command decoder configured to decode an external command signal to generate a write command signal and an input latency control circuit configured to gate an address signal in a pipeline mode to generate a column address signal and a bank address signal based on the internal clock signal, the write command signal and the write latency signal. The example input latency control circuit may include a master circuit configured to generate a column control signal and a first write address control signal based on an internal clock signal, a write command signal and a write latency signal, at least one column slave circuit configured to gate a first address signal in a pipeline mode to generate a column address signal in response to the column control signal and one of the first write address control signal and a second write address control signal and at least one bank slave circuit configured to gate a second address signal in the pipeline mode to generate the bank address signal in response to the column control signal and at least one of the first and second write address control signals.