1. LE1201
Standalone
Boundary Scan Test (BST)
with
XJTAG
XJLink2 Controller
Lorenzo Electronics, LLC

2. Goal
• In order to broaden the commercial JTAG controllers that are
supported by LE1200/1201 Automatic Test Equipment, an
XJTAG XJLink2 was acquired thanks to XJTAG's free trial
program.
• Existing LE1200/1201 system software are enhanced to handle
XJLink2.
• Only low level XJLink2 API will be used.
• The new LE1201 should pass several existing test setups.
Lorenzo Electronics, LLC

3. Standalone BST on FPGA
• In this test, Xilinx FPGA chip (center) 4-wire JTAG pins
and ground wires are connected XJTAG XJLink2 JTAG port
controller (right).
• Other FPGA pins connected to LCD control/data bus are
controlled by a test program writing Lorenzo-XJLink2 on
the LCD display via the associated boundary scan cells.
Lorenzo Electronics, LLC

4. sysout screen for a paused test execution
• BST execution sysout screen lists the test pattern numbers as
well as the associated test program source lines.
• Boundary scan pins connected to the LCD data bus are grouped
together with the group name: data. Setting up data bus with an
ASCII character followed by the pulsing of write signal will
latch the character into the LCD display.
Lorenzo Electronics, LLC

5. Snippet of a BST output file (*.csv)
• Record detailed tri-ctrl/output cells driving states and captured
input cells logic states for each test pattern.
• Highlighted spreadsheet column CU shows FPGA pin IO_AB4
tri-ctrl/output cells, #547 and #548 respectively, are in active
driving states. It's the write signal writing to the LCD one
character every 3 test patterns.
• The column to the left, column CT, indicates the same FPGA
pin input cell check state of X. Test program has opted to
ignore the captured input cell logic state.
Lorenzo Electronics, LLC

6. • To ensure that the BST fault detection capability, Microchip
Technology Inc. Explorer 16 MPU development board is tested
with LE1201 and XJLink2 controller.
• Previously developed test program pass the MPU boundary
scan test – without change or re-compilation.
• Fault insertion tests successfully detect the faulty MPU pin.
Lorenzo Electronics, LLC