Transmitter with voltage level adjustment mechanism in memory controller

A memory system, comprising:

• a memory controller comprising a plurality of transmitters, wherein the transmitters are configured to generate a plurality of data signals, respectively;
• and
• a memory module comprising a plurality of receivers, wherein the receivers compare the plurality of data signals with a reference voltage to generate a plurality of output signals, respectively;
• wherein the plurality of transmitters comprise a first transmitter, the memory controller further comprises a first pull-up variable resistor and a first pull-down variable resistor, wherein the first pull-up variable resistor is coupled between a supply voltage and an output terminal of the first transmitter, and the first pull-down variable resistor is coupled to the output terminal of the first transmitter;
• and the memory controller further comprises a control circuit configured to control the first pull-up variable resistor and/or the first pull-down variable resistor according to the reference voltage used by the memory module.

A control method of a memory controller, wherein the memory controller comprises a plurality of channels, and a first channel of the plurality of channels comprises:

• a first transmitter;
• a first pull-up variable resistor, coupled between a supply voltage and an output terminal of the first transmitter;
• and
• a first pull-down variable resistor, coupled to the output terminal of the first transmitter;
• and
• the control method comprises the steps of:
• controlling the first pull-up variable resistor and/or the first pull-down variable resistor according to a reference voltage used by the memory module.