Multi-value logic signaling in multi-functional circuits

摘要

An integrated circuit comprises a circuit module, a first function circuit, and a second function circuit. The first function circuit is configured to be operational in response to a first type logic signal at a first pin and the second function circuit is configured to be operational in response to a second type logic signal at the first pin. The type of logic signal at the first pin is determined by the circuit module. Based on the determined type of logic signal, the circuit module is configured to activate the appropriate function circuit and provide function related signaling for operation at a second pin. The circuit module allows the pins of the integrated circuit to be shared between the first and second function circuits, thus minimizing the number of pins required for multi-functional circuits on the integrated circuit.

主权项

1. An integrated circuit, comprising:
a first function circuit configured to be operational in response to a first type of logic signal at a first pin; a second function circuit configured to be operational in response to a second type of logic signal at the first pin; and a circuit module configured to:
determine a first difference between a first threshold voltage value and a voltage value at the first pin;determine a second difference between a second threshold voltage value and the voltage value at the first pin;determine a type of logic signal at the first pin based on the first difference and the second difference;detect a digital signal signature at a second pin in response to the determined type being the second type of logic signal; andactivate the second function circuit in response to the detected digital signal signature.