Apparatus and method for testing crossover voltage of differential signals
AssigneeVIA Technologies, Inc.
InventorsPo-chuan Chen, Ta-Hsiu Huang, Shou-Cheng Kao
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Abstract
An apparatus and method for processing a differential-type signal transmitted through a pair of data lines. First, a voltage range defined by an upper reference and a lower reference and a logic pattern are provided. Then, the signal is tested to generate logic data responsive to the voltage range. Next, the logic data are utilized to compare with the logic pattern so as to generate a test result when the signal enters a transition cycle.
Claims43
An apparatus for processing a signal transmitted through a pair of data lines, comprising:
- two tester channels, each of which corresponds to one of said data lines and comprises:
- a first comparator having a first inverting input for receiving an upper reference and a first non-inverting input for connecting with said corresponding data line;
- a second comparator having a second inverting input for connecting with said corresponding data line and a second non-inverting input for receiving a lower reference;
- and
- a logic circuit coupled to said first comparator and said second comparator;
- wherein said first comparator and said second comparator generate logic data responsive to said upper reference and said lower reference when said signal enters a transition cycle, and said logic circuit compares said logic data with a logic pattern and generates a test result, accordingly.
A method for processing a signal transmitted through a pair of data lines, comprising:
- providing a voltage range defined by an upper reference and a lower reference;
- providing a logic pattern;
- testing the signal to generate logic data responsive to the voltage range;
- and
- comparing the logic data with the logic pattern without storing the logic data to generate a test result when the signal enters a transition cycle.
An apparatus for processing a signal transmitted through a pair of data lines, comprising:
- two tester channels, each of which corresponds to one of the data lines and comprises:
- a first comparator having a first inverting input for receiving an upper reference and a first non-inverting input for connecting with the corresponding data line;
- a second comparator having a second inverting input for connecting with the corresponding data line and a second non-inverting input for receiving a lower reference;
- and
- a logic circuit coupled to the first comparator and the second comparator, wherein the first comparator and the second comparator generate logic data responsive to the upper reference and the lower reference when the signal enters a transition cycle, the logic circuit compares the logic data with a logic pattern and generates a test result, accordingly, and the signal is a differential-type signal.
A method for processing a signal transmitted through a pair of data lines, comprising:
- providing a voltage range defined by an upper reference and a lower reference;
- providing a logic pattern;
- testing the signal to generate logic data responsive to the voltage range;
- and
- comparing the logic data with the logic pattern to generate a test result when the signal enters a transition cycle;
- wherein the signal is a differential-type signal.
A method for processing a signal transmitted through a pair of data lines, comprising:
- providing a voltage range defined by an upper reference and a lower reference;
- providing a logic pattern;
- testing the signal to generate logic data responsive to the voltage range;
- and
- immediately after testing, receiving the generated logic data and immediately thereafter comparing the received logic data with the logic pattern to generate a test result when the signal enters a transition cycle.
Dependencies are inferred from the claim text.