Boundary-scan test for structural fault detection
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1 Boundary-scan test for structural fault detection J. M. Martins Ferreira FEUP / DEEC - Rua Dr. Roberto Frias Porto - PORTUGAL Tel / Fax: [ jmf@fe.up.pt ] Tallinn Technical University :: May 4th 29 This presentation is available at Tallinn Technical University :: May 4th 29 1 / 32
2 Outline 1. Introduction to the IEEE boundary-scan test (BST) standard Part 1 2. The remote BST controller (MWS-TAP) Break 3. The demonstration board 4. Open and short fault detection Tallinn Technical University :: May 4th 29 2 / 32
3 1: The IEEE std (boundary-scan test) Why do we need it and for what? The test principle BS cells and test architecture The on-chip controller The test modes (instructions) Tallinn Technical University :: May 4th 29 3 / 32
4 Why Boundary Scan Test? The two main reasons that led in the mid- 8s to the development of BST were: The complexity of ICs made it exceedingly difficult to develop test programs for the functional test of complex PCBs Small outline surface mount devices and advanced mounting technologies almost disabled physical access to internal PCB nodes and made in-circuit test exceedingly difficult Tallinn Technical University :: May 4th 29 4 / 32
5 The application domain of BST BST addresses the structural test of digital printed circuit boards Keywords: structural, digital, PCBs This embedded test infrastructure is now used for other purposes as well (e.g. in-system programming) Tallinn Technical University :: May 4th 29 5 / 32
6 The BS test principle BS uses a Test Access Port (TAP) to decouple the internal IC logic from the pins and allows direct access to any PCB node without backdriving effects BS cell: Serial output Parallel input Serial input Parallel output TDI TCK TDO TMS TDI TCK TDO TMS Tallinn Technical University :: May 4th 29 6 / 32
7 BS cell: The basic BS cell P arallel input Serial output Serial input Parallel output TDI TCK TDO TMS TDI TCK TDO TMS Three modes of operation: Transparency Controllability Observability Parallel input Serial output mux mux Parallel output Registo BST Serial input C/S L Tallinn Technical University :: May 4th 29 7 / 32
8 The BS architecture P arallel input BS cell: Serial output Serial input Parallel output TDI TCK TDO TMS TDI TCK TDO TMS Main blocks: BST register BP register Instruction register TAP controller Other registers TDI /TRST TMS TCK TAP contr. BST register User data reg. Identific. reg. BP reg. Decoder Instruction reg. Data mux Data / instr. mux Tallinn Technical University :: May 4th 29 8 / 32 TDO
9 TAP controller state Parallel input mux Serial output mux Parallel output transition diagram 1 Test Logic Serial input C/S L Reset Run Test / Idle 1 1 Select DR 1 Select IR Capture DR Capture IR 1 1 Shift DR Shift IR BST register User data reg. Identific. reg. BP reg. Data mux Data / instr. mux 1 1 Exit-1 DR Pause DR Exit-1 IR Pause IR 1 TDI /TRST TMS TCK TAP contr. Decoder Instruction reg. TDO Exit-2 DR 1 Update DR 1 Exit-2 IR 1 Update IR 1 Tallinn Technical University :: May 4th 29 9 / 32
10 BST instructions Mandatory: EXTEST SAMPLE / PRELOAD BYPASS Optional: INTEST, RUNBIST, CLAMP, IDCODE, USERCODE, HIGHZ BST register User data reg. Identific. reg. BP reg. BST register Data mux Data / instr. mux TDO Tallinn Technical University :: May 4th 29 1 / 32
11 2: The remote BST controller (MWS-TAP) Why / What is it for? The hardware setup Configuration The MWS-TAP application The test program Tallinn Technical University :: May 4th / 32
12 Why / what for? To enable the students to write real test programs in SVF and to execute online To provide a tool for test program validation To facilitate hands-on sessions with real 1149.X hardware Tallinn Technical University :: May 4th / 32
13 Setup: The MWS board The micro web server TAP controller application uses a DSTINIm4 evaluation board (with a networked microcontroller from Maxim-Dallas) The current prototype controls one BS chain Tallinn Technical University :: May 4th / 32
14 MWS board: the JTAG pins TMS TCK TDO TDI Tallinn Technical University :: May 4th / 32
15 Setup: IP and connections An RS232C port can be used to program a valid IP address into the micro web server board The server application can then be loaded by FTP and launched via Telnet Tallinn Technical University :: May 4th / 32
16 Set up (cont.) If the current IP of the MWS is known, a quicker set up procedure is possible: Connect the card directly to a computer using a regular LAN cable and telnet to its IP address Set up the new IP address (cuts the current connection if in different subnets), e.g. ipconfig -a m g Set the current IP of the computer to the same subnet and reconnect (or use the LAN) Tallinn Technical University :: May 4th / 32
17 MWS-TAP set IP address and connect Tallinn Technical University :: May 4th / 32
18 MWS-TAP Open / write a new SVF test program Tallinn Technical University :: May 4th / 32
19 Boundary-scan test for structural fault detection Short break! Tallinn Technical University :: May 4th 29 Tallinn Technical University :: May 4th 29 This presentation is available at Tallinn Technical University :: May 4th / 32
20 Outline of this talk 1. Introduction to the IEEE boundary-scan test (BST) standard 2. The remote BST controller (MWS-TAP) Break 3. The demonstration board 4. Open and short fault detection Part 2 Tallinn Technical University :: May 4th 29 2 / 32
21 3: The demonstration board What s in it? Schematic Integrity check BS in practice (led control) Tallinn Technical University :: May 4th / 32
22 Block diagram of the demonstration board TDO 1 TDI 1 I7 I6 I5 I4 I3 I2 I1 I TDI TDO net 7 net 6 net 5 net 4 net 3 net 2 net 1 net net 9 net 8 BS Component Cluster BS Component 1 Cluster (IC3) (IC1 and IC2) (IC4) (IC6) A B /G1 /G2 2Y3 2Y2 2Y1 2Y /1Y3 /1Y2 /1Y1 /1Y net 13 net A1 B1 A2 B2 A3 B3 A4 B4 S /G net 14 net 15 1 Y net 23 Y net 22 Y net 21 Y net net net net net 16 BS Component 2 (IC5) O7 O6 O5 O4 O3 O2 O1 O net 11 net 1 Tallinn Technical University :: May 4th / 32
23 Schematic diagram Tallinn Technical University :: May 4th / 32
24 Integrity check of the BS infrastructure Detection of: Faulty TAP pins Faulty / misplaced components Sequence of operations: TDI TDI TDI XX... X1 XX...X1 XX... X 1 TDO TDO Reset (TRST or 5 x TMS1) IR capture and scan ID capture and scan (if supported) TDO Tallinn Technical University :: May 4th / 32
25 Led control What BS instruction? What test vector (into the BS register)? instructions BS register Tallinn Technical University :: May 4th / 32
26 MWS-TAP Example (led control) Tallinn Technical University :: May 4th / 32
27 4: Open and short fault detection Detection of an open fault Detection of a short-circuit Further recommended exercises Tallinn Technical University :: May 4th / 32
28 Detection of open circuit X1 What conditions enable the detection of open circuit X1? /G A B /Y /Y1 /Y2 /Y3 Tallinn Technical University :: May 4th / 32
29 Detection of short-circuit X2 What conditions enable the detection of short circuit X2? /G A B /Y /Y1 /Y2 /Y3 Tallinn Technical University :: May 4th / 32
30 Detection of short circuit X9 What conditions enable the detection of short-circuit X9? Tallinn Technical University :: May 4th 29 3 / 32
31 Detection of short circuit X16 What conditions enable the detection of shortcircuit X16? Tallinn Technical University :: May 4th / 32
32 Boundary-scan test for structural fault detection Thanks for your attention! J. M. Martins Ferreira [ jmf@fe.up.pt ] Tallinn Technical University :: May 4th 29 This presentation is available at Tallinn Technical University :: May 4th / 32
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