Derives its name from diagram shape Resembles eye shaped pattern Gives quick view Into system performance and issues leading to errors Generating the Eye Diagram Eye diagram generated by overlaying Sweeps of different segments of long data stream Triggering edge not important Displayed pulse transitions may go either way Positive and negative going pulses superimposed on each other Yields open eye shaped pattern Properly constructed diagram Should contain every possible bit sequence Patterns of alternating 0’s and 1’s Isolated 1’s long run of 0’s and vice versa Other patterns that might signal design weaknesses Objective of generating eye diagram Gain insight into nature of signaling imperfections That can lead to errors in interpreting data bit at receiver In working with scope and scope probe Important to determine where to place probe To generate useful eye diagram To aide in identifying source of problems Must recognize probe placement and grounding Can affect signals being measured Can get differing display based upon placement In ideal signaling world Eye diagram looks like rectangular box In real-world Signaling imperfect Transmissions and communication imperfect Transitions do not align perfectly Shape of diagram depends upon Triggering Clock based Divided clock Pattern trigger Signal timing and amplitude
Derives its name from diagram shape Resembles eye shaped pattern Gives quick view Into system performance and issues leading to errors Generating the Eye Diagram Eye diagram generated by overlaying Sweeps of different segments of long data stream Triggering edge not important Displayed pulse transitions may go either way Positive and negative going pulses superimposed on each other Yields open eye shaped pattern Properly constructed diagram Should contain every possible bit sequence Patterns of alternating 0’s and 1’s Isolated 1’s long run of 0’s and vice versa Other patterns that might signal design weaknesses Objective of generating eye diagram Gain insight into nature of signaling imperfections That can lead to errors in interpreting data bit at receiver In working with scope and scope probe Important to determine where to place probe To generate useful eye diagram To aide in identifying source of problems Must recognize probe placement and grounding Can affect signals being measured Can get differing display based upon placement In ideal signaling world Eye diagram looks like rectangular box In real-world Signaling imperfect Transmissions and communication imperfect Transitions do not align perfectly Shape of diagram depends upon Triggering Clock based Divided clock Pattern trigger Signal timing and amplitude
SignalIntegrity2.docx