Dual pseudo reference voltage generation for receivers

In a circuit comprising a driver, power supply plane, a ground supply plane, a high reference voltage generator, and a low reference voltage generator, a method for generating reference voltages for detection by a receiver, the method comprising:

• generating a first signal by the driver, the first signal has a present voltage level and a previous voltage level;
• generating a high reference voltage signal from a high reference output of a high reference voltage generator, the high reference output coupled to the ground supply plane;
• generating a low reference voltage signal from a low reference output of a low reference voltage generator, the low reference output coupled to the power supply plane;
• selecting one of the high reference voltage signal and the low reference voltage signal based upon the previous voltage level;
• and
• comparing the present voltage level and the selected one of the high reference voltage signal and the low reference voltage signal.

A bus, the bus comprising:

• a power supply plane;
• a ground plane;
• a signal source including,
• a driver adapted to generate a first signal to a receiver, the first signal having a present voltage level and a previous voltage level, the driver coupled to the power supply plane and the ground plane,
• a low reference voltage generator having a low reference output coupled to the power supply plane, the low reference voltage generator is to produce a low reference voltage signal at the low reference output, and
• a high reference voltage generator having a high reference output coupled to the ground supply plane, the high reference voltage generator is to produce a high reference voltage signal at the high reference output, the high reference voltage generator and the low reference voltage generator are capable of communicating the high reference voltage signal and the low reference voltage signal to the receiver.