Simulation
Last Edit July 22, 2001
AC Test
An optional simulation is that for AC test measurements. If measurements
are to be done, the simulations are required. As with at-speed, both sampled
and print on change files are required. Sampling is done at 100 ns intervals.
These files show 16 AC tests, propagation path measurements only. A test
is one input to one output and one edge (rising or falling). The reset
is handled as before at the beginning of the file.
AC test submission is complicated and extensive information is required
for each test. AMCC offers AMCCSUBMIT, test submission software, to help
with the process. Such support is vendor-specific, as is the vector check
software.
Figure 8-6 shows a sampled AC test file (16 tests) and Figure 8-7 shows
the same tests, print-on-change. (This is not the Q20000 circuit.)
These files pass the AMCC vector check software.
Figure 8-6 AC Test Sampled Simulation - 32-Bit
Register (partial)
Figure 8-6 AC Test Sampled Simulation - 32-Bit
Register - Full listing
Figure 8-7a AC Test Print-On Change Simulation
- 32-Bit Register (partial)
Figure 8-7b AC Test Print-On Change Simulation
- 32-Bit Register - Full listing
Exercise
Create a complete AC test vector set for the schematics shown in the
Appendix of Chapter 3.
Exercises
- For your version of the 32-bit register (assigned earlier), create
functional simulation vector files following the rules for the array
vendor selected.
- What other simulations are required?
- Review the vendor design submission package.
- What vector checking software tools are available?
- For the circuit shown, obtain a Q20000 Design Guide and compute the
actual maximum frequency of operation for this circuit. (Refer to Chapters
5 and 6.)
- For your version of the 32-bit register, compute the maximum frequency
of operation and the resulting at-speed sample step required for the
simulation file.
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