At-Speed Test Considering Deep Submicron Effects. D. M. H. Walker Dept. of Computer Science Texas A&M University
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1 At-Speed Test Considering Deep Submicron Effects D. M. H. Walker Dept. of Computer Science Teas A&M University
2 Integrated Circuit Testing
3 IC Test What s Going On Test Generation Test Patterns ATE (Automatic Test Equipment) Response Stimulus DUT (Device Under Test) Go/No Go (Failure Details)
4 Types of Tests for Digital Circuits Functional Apply tests according to spec Random patterns Structural Verify structures in place Use a fault model Test speed Slow - boolean tests find short/open Fast - at-speed tests find etra delay Focus in this talk is at-speed structural test
5 Test Cost Must Fall Fast Test cost/transistor must follow Moore s Law 100 Cost/ Xistor (μcents) 10 1 Need 100 transistor test cost reduction! 0.1 ITRS2005, Cost-Perf MPU Year
6 But Test cell cost not following Moore s Law Already using DFT tester or old ATE Handler and probe card cost not scaling High-speed I/Os cost more Must reduce test time Parallel testing running out of gas Must reduce test time per transistor Constant test time per chip
7 Reducing Test Time Per Transistor Less time, more transistors must wiggle more wires in less time Higher power dissipation But tests/transistor rising to cope with DSM Even higher power dissipation
8 But Ma Power/Transistor is Falling 1000 nw/istor 100 ITRS2005, Cost-Perf MPU Year
9 Future Digital Test All About Power? Fraction of chip that can be fired up at one time is decreasing Mission-mode power constraints Test supply noise Test thermal limits Limits intra-die test parallelism How to screen most defects per Joule?
10 Eliminate Wasted Energy Useless transitions Scan power Unnecessary capture power Much research/commercial activity Low-odds test patterns Luck tails of BIST, WRP Shotgun blasts N-detect, DOREME, TARO,
11 Squeeze Chip Harder Instead IDDQ MINVDD Small Delay Defect KLPG
12 Our Delay Test Research Defect-Based Delay test ATPG considering: Resistive shorts and opens Process variation Capacitive crosstalk Temperature gradients Power supply noise Power dissipation
13 Kitchen Sink Fault Model Have we forgotten anything? Crosstalk Die-to-Die Supply Temp Litho Intra-Die Spot Defect Noise Process Variation Functional Failure Local Delay Fault Combined Delay Fault Global Delay Fault Reliability Hazard
14 Target Realistic Defects Resistive Short Stanojevic et al Resistive Open Madge et al
15 But Fault population too large Limited fault model accuracy Limited fab data Limited calibration time, cost Fault model must be abstract enough for fortuitous detection of unmodeled faults The vectors do the work, not the fault model J. H. Patel
16 Our Approach Test K longest rising/falling paths through each gate/line (KLPG) Targets resistive shorts and opens Larger K deals with delay uncertainty Supply noise Process variation Delay modeling errors Crosstalk
17 K Longest Paths Per Gate (KLPG) CodGen ATPG developed at Teas A&M CodSim fault simulator Tests K longest paths through each gate/line Detects small defects on each gate/line Covers all transition faults Needs circuit delay information (SDF) May produce more patterns than TF test
18 Apply KLPG to Industrial Designs TetraMAX/FastScan dofile/procfile/library Hierarchical Verilog Design Same inputs as TF test generation sdf KLPG Test Generator K CPU Time: ~3 TF test generation Memory: 400 MB/1M gates Test Sequence Load pattern Pulse clock... Test Data Tester Only 0 s & 1 s are different from TF ATPG outputs
19 Chips are Slower Using KLPG Test Transition fault test 10 ns KLPG-1 test 11 ns 180 nm / 40k gates / full scan / 2.3k scan cells
20 Cleaner Shmoo Transition Fault KLPG
21 KLPG Silicon Eperiment TI ASIC design 738K gates (597K gates in 250 MHz clock domain) 130 nm technology 5 clock domains (highest 250 MHz) 8 scan chains, mued D flip-flops in 250 MHz domain 24 devices marginally pass regular TF test
22 KLPG Test Results Up to 3% delay decrease seen in KLPG-1 KLPG unique detects
23 Dynamic Compaction Test Set Compaction Static Compaction Performed after test generation Dynamic Compaction Performed during test generation Classic method good for stuck-at tests but not suitable for path delay tests Develop dynamic compaction for KLPG tests
24 Dynamic Compaction Approach V2 V1 1X XX I1 O1 X1 11 I2 Path1 O2 00 0X I3 O3 XX XX I4 I5 A O4 O5 V4 X1 X1 I6 O6 1X I1 O1 V3 XX X0 1X XX Vector pair and NAs (circles) for Path1 I1 I2 I3 I4 I5 I6 Path2 B O1 O2 O3 O4 O5 O6 00 XX I2 I3 I4 I5 I6 Path1 A Path2 B O2 O3 O4 O5 O6 Vector pair and NAs for Path1 & 2 Vector pair and NAs (Xs) for Path2
25 Test Size (KLPG-1 vs. Transition) Robust Nonrobust Long TF Total Comm. TF s15850 s35932 s38417 s38584 chip1 chip2a chip
26 Constant Power Dissipation Constant power ~linear temperature rise Easy to characterize Know temperature for each pattern Adjust test timing for each pattern Circuit slows down as temperature rises 35-55% delay increase for 100 C rise in 65 nm Reorder patterns for constant power dissipation
27 s38417 Results Initial Power Final Power Shift Power Group #
28 Conclusions Demonstrated KLPG on industrial designs Modest test data volume increase Affordable ATPG time increase Demonstrated constant power reordering Not discussed: supply noise model demonstrated on industrial design
29 Questions?
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