Samsung Electronics Co., Ltd.

Yonsei University

Wang-Soo Kim

Jung-Hwan Choi

Chang-Kyo Lee

Yoo-Chang Sung

Jin-Seok Heo

Ju-Ho Jeon

Ki-Duk Park

Jin-Sung Youn

Jong-Hoon Kim

Young-ho Lee

Young Nam Yun

Woo-Young Choi

Sung-joo Park

Yoo-Jeong Kwon

Si-Hoon Ryu

A memory module includes a plurality of semiconductor memory devices associated with a same module board. The plurality of semiconductor memory devices configured to simultaneously perform a training operation, the plurality of semiconductor memory devices including a reception interface circuit configured to perform the training operation to search for selected equalization coefficients of an equalizer based on a training pattern from a memory controller, and transmit a training information signal to the memory controller in a training mode in response to a training command from the memory controller, the training information signal including the selected equalization coefficients.

Memory modules, memory systems and methods of operating memory modules

A memory module includes semiconductor memory devices mounted on a circuit board and a control device mounted on the circuit board. The control device receives a command, an address, and a clock signal from an external device, and provides the command, the address, and the clock signal to the semiconductor memory devices. The control device, in a hidden training mode during a normal operation, performs a command/address training on at least one semiconductor memory device of the semiconductor memory devices by transmitting a first command/address and a first clock signal to the at least one semiconductor memory device and receiving a second command/address and a second clock signal in response to the first command/address and the first clock signal, from the at least one semiconductor memory device.

Memory modules, memory systems, and methods of operating memory modules

A duty cycle correcting device is provided which includes a pulse width adjusting unit which adjusts a pulse width of an input signal according to a pulse width control code; a comparison unit which compares an output signal of the pulse width control unit with a plurality of reference voltages; and a control unit which selects one of a plurality of pulse width control codes based on comparison data from the comparison unit and provides the selected pulse width control code to the pulse width adjusting unit.

Device and method for correcting duty cycle, and receiver including the same

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Seoul, South Korea

Wang-Soo Kim