PVT controller for programmable on die termination

1. A device comprising:

a first circuit to receive a first signal from a communication line;

a second circuit coupled to the first circuit to determine a resistance of the first circuit during a reception of the first signal, the first signal transitioning from a first voltage to a second voltage wherein the first circuit comprises a plurality of on die resistors; and

a third circuit coupled to the second circuit to detect one of a physical characteristic, temperature and voltage of the device;

wherein the third circuit encodes a set of detected conditions;

wherein the encoded a set of detected conditions comprises an 8 bit code and the second circuit comprises a conversion circuit to convert the 8 bit code to a 5 bit code.

2. The device of claim 1 , wherein the second circuit adjusts the resistance based on circuit conditions including one of physical characteristics of the device, temperature and voltage.

3. The device of claim 1 , wherein the second circuit comprises a plurality of programmable transistors to adjusts the resistance.

4. The device of claim 3 , wherein the programmable transistors comprise complementary pull up transistors and complementary pull down transistors.

5. The device of claim 1 , wherein the on die resistors are polyresistors.

6. The device of claim 1 , wherein the polyresistors comprise a first polyresistor; and

further comprising a second polyresistor coupled between the complementary pull up transistors and the first polyresistor, and a third polyresistor coupled between the complementary pull down transistors and the first polyresistor.

7. A device comprising:

a set of transistors on die;

a first set of polyresistors including a first and a second polyresistor, the first set coupled to the set of transistors;

a second set of polyresistors inducing the second and a third polyresistor, the third polyresistor coupled to the first set of polyresistors, the first and second set of polyresistors having a predefined total resistance and predefine on die area; and

an input pad coupled to the second set of polyresistors;

wherein if the first set of polyresistors has a higher resistance than the second set of polyresistors then the device has a wider range of programmable resistances than if the first and second set of polyresistors had equal resistance.

8. A device comprising:

a set of transistors on die;

a first set of polyresistors including a first and a second polyresistor, the first set coupled to the set of transistors;

a second set of polyresistors including the second and a third polyresistor, the third polyresistor coupled to the first set of polyresistors, the first and second set of polyresistors having a predefined total resistance and predefine on die area; and

an input pad coupled to the second set of polyresistors;

wherein if the second set of polyresistors has a higher resistance than the first set of polyresistors then the device has a greater linearity of resistance during transition of a signal from a first voltage to a second voltage that is received at the input pad than if the first and send set of resistors had equal resistance.

9. The device of claim 8 , wherein the set of transistors comprises a set of programmable transistors.

10. The device of claim 9 , wherein the programmable transistors comprise a set of complementary pull up transistors and a set of complementary pull down transistors.

11. A machine readable medium having instructions stored therein which when executed cause a machine to perform a set of operations comprising:

detecting a condition in a device;

generating an encoded signal representing the condition;

programming an on die termination circuit comprising a plurality of on die resistors to compensate for the condition;

converting the encoded signal into a driver signal to program the on die termination circuit; and

receiving an external signal at a rate of 200 to 400 mega transfers per second (MTS) at the on die termination circuit; and

terminating the external signal.