Impedance adjustment

An integrated circuit device, comprising:

• a controller;
• and
• a signal driver circuit comprising:
• a plurality of first termination devices, each having a particular configuration of switchable resistances, and having a first strength;
• and
• a plurality of second termination devices, each having the particular configuration of switchable resistances, and each having a strength less than the first strength;
• wherein each first termination device of the plurality of first termination devices and each second termination device of the plurality of second termination devices are each connected to a respective set of signal lines, each set of signal lines having a same number of signal lines;
• and
• wherein the controller is adapted to apply a same set of control signals to the configuration of switchable resistances of each activated first termination device through its respective set of signal lines and to the configuration of switchable resistances of each activated second termination device through its respective set of signal lines.

A method of operating an integrated circuit device, comprising:

• connecting a node of the integrated circuit device to a first voltage node through a reference resistance and connecting the node to a second voltage node through a termination device of a signal driver circuit;
• adjusting a resistance value of the termination device;
• comparing a voltage level at the node to a reference voltage, wherein the reference voltage has a voltage level different than half-way between a voltage level of the first voltage node and a voltage level of the second voltage node;
• when the comparing of the voltage level at the node to the reference voltage is deemed a match of the voltage level at the node and the reference voltage, storing settings of the termination device in response to deeming the match of the voltage level at the node and the reference voltage;
• and
• when the comparing of the voltage level at the node to the reference voltage is not deemed a match of the voltage level at the node and the reference voltage, further adjusting the resistance value of the termination device.