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An Update on 1149.6 Maintenance Work

An Update on 1149.6 Maintenance Work. Bill Eklow, Cisco Systems, Inc. Background. 1149.6 Approved in March, 2003 Extension to 1149.1 for “Advanced Digital Networks” Targets AC-Coupled AND Differential Nets Initially used by telecom companies, use is spreading with high speed serdes

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An Update on 1149.6 Maintenance Work

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  1. An Update on 1149.6 Maintenance Work Bill Eklow, Cisco Systems, Inc.

  2. Background • 1149.6 Approved in March, 2003 • Extension to 1149.1 for “Advanced Digital Networks” • Targets AC-Coupled AND Differential Nets • Initially used by telecom companies, use is spreading with high speed serdes • Now due for 5 year tuneup

  3. Update-DR TX RX Capture-DR Background: Effect of Signal Decay ? Vref

  4. Pass X Background: 1149.1 Analog model SA1 • Reduced Fault Coverage • Limited Diagnostic Capability

  5. IEEE 1149.6 Solution Architecture

  6. Output Boundary Structures • TAP logic to create AC Test Signal Based on Fig. 51, IEEE 1149.6 Std.

  7. Analog Test Receiver

  8. Hysteresis Preload Race Condition

  9. Observations from the first 5 years • Luck – group hit technology inflection point • Test receiver design difficult • Timing was not/is not an issue • People got it on AC-coupling, not differential • Use is picking up due to AC-coupling on more “commercial” protocols • Issues with “DC-coupled” nets

  10. Conclusion • Standard performed well over first 5 yrs. Only minor changes required. • Design practices/requirements need to be better explained • Use of dot 6 for DC coupled nets is a hard sell. • Major contribution of next revision will be Initialize

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