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Testing Framework for External Load and Data Structure in IBIS ISS Subcircuits

This document outlines the test cases and methodologies for validating the external load and data structures within IBIS ISS subcircuits. It details the procedure for testing input/output configurations, output buffers, and various signal waveform formats. Various test cases, including output/I/O tests and input tests with buffer considerations, are described. It also addresses questions about stimulus definitions and the required formats for external data waveforms, ensuring proper validation of series models through comprehensive testing strategies.

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Testing Framework for External Load and Data Structure in IBIS ISS Subcircuits

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  1. External Load/Data Bird What are the goal with the External load/data structure.

  2. Test Cases Output I/O Input IBIS ISS Subcircuit Port 1 - Port n Case 1, TEST OF OUTPUT or I/O Output I/O IBIS ISS Subcircuit Port 1 - Port n Case 2, TEST OF OUTPUT or I/O

  3. Test Cases Output I/O Input IBIS ISS Subcircuit Port 1 - Port n Case 3, Test of Input Input IBIS ISS Subcircuit Port 1 - Port n Case 4, Test of Input

  4. Testcases Output I/O Input IBIS ISS Subcircuit Port 1 - Port n Case 5, TEST OF DIFF OUTPUT or I/O IBIS ISS Subcircuit Port 1 - Port n Case 6, TEST OF DIFF OUTPUT or I/O

  5. Testcases Output I/O Input IBIS ISS Subcircuit Port 1 - Port n Case 7, Test of diff Input Input IBIS ISS Subcircuit Port 1 - Port n Case 8, Test of diff Input

  6. All Cases • Waveform data can be defined for nodes made external in the IBIS ISS subcircuit declaration. • Tested buffer assumed part of same IBIS file, referred to by [Model] name. • How are we testing series models? • Stimuli definition needed, Format ? Internal in IBIS or external file ? Format: time edge ? (states 1, 0, HiZ ?) Example: Time state T1 Z T2 1 T3 0 T4 1 .. .. ..

  7. All Cases • --------------------------------------------------------------- • Test data waveforms are external to ibis file. • Test data waveforms format need to be defined. Example: TIME nodename1 nodename2 nodename3 … Timepoint V(nodename1) V(nodename2) V(nodename3) …. No definition of the number of points, implicity declared by the number of lines in the file, is that okay ? • Number of nodenames allowed in one IBIS ISS load ?

  8. Case 1 Output, I/O testing using input buffer. • Output or i/O buffer internal to IBIS file. • Input buffer internal to IBIS file ?, external to IBIS file ?

  9. Case 2 Output, I/O testing using IBIS ISS load. • External IBIS ISS load used.

  10. Case 3 Input testing using output or I/O buffer. • Input buffer internal to IBIS file. • Output or I/O buffer internal to IBIS file ?, external to IBIS file ?

  11. Case 4 Input testing using IBIS ISS “source”. • Input buffer internal to IBIS file. • IBIS ISS “source” external to IBIS file ?

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