ScanWorks® JTAG Boundary Scan 400 IO Module

Product Overview

With the Boundary Scan 400 IO (BSIO-400) module the nets between the connector on the unit under test (UUT) and the boundary scan devices on the UUT can be fully tested and verified. These nets often are difficult to test because boundary scan access often is not provided at the UUT's connector.

The BSIO-400 provides 400 boundary-scan test channels that can increase the test coverage on the UUT. These test channels are bi-directional and individually controllable, enabling full boundary-scan test coverage of the nets between the UUT's connector and the on-board boundary scan devices. Multiple BSIO-400 modules can be connected together to increase the number of test channels indefinitely.

Using the Boundary Scan 400 IO Module

The BSIO-400 is a small, low-cost module intended to be designed into a UUT's test fixture. All of the BSIO-400's test channels and power signals are available through an edge connector, enabling easy installation and removal. The test access port (TAP) signals are available on 14-pin headers that are compatible with the ScanWorks PCI-100 Boundary-Scan Controller.

The test channels on the BSIO-400 are driven by the IO pins of standard, off-the-shelf programmable logic devices (PLDs) so that each channel can be independently controlled. Each IO pin has a control cell for independently setting an input, output, or high impedance state. To ensure safe conditions are always maintained or to include built-in test features, the BSIO-400's PLDs can be programmed through ScanWorks. The Boundary Scan 400 IO module comes with a Xilinx XC95144XL-TQ100 PLD which provides a 3.3V (5V compatible) interface to the UUT and requires 3.3V power from the test fixture or external power supply. The BSIO-400's PLDs are installed in sockets, enabling other pin-compatible devices to be installed for other voltages, such as 1.8V, 2.5V, 3.3V or 5.0V. All PLDs in a particular configuration of the BSIO-400 must support the same voltage.

Test Generation

BSIO-400 tests are created with ScanWorks' standard automatic test generation tools. The software that's included with the Boundary Scan 400 IO module features the boundary-scan path description and the netlist files that are needed to merge the BSIO-400 with the UUT. The ScanWorks Netlist Merging option is used to easily merge netlists. The ScanWorks design description and net list merging tools provide an easy way to integrate the BSIO-400 into a test fixture.

The ScanWorks project management structure makes it simple to create a design that describes the UUT without the BSIO-400 and then create another design that describes the combination of the UUT and the BSIO-400. Once the UUT and BSIO-400 are combined in a single design, scan path verification, interconnect testing and any other test or programming action can be easily generated through ScanWorks. Net names are clearly identified to distinguish between the nets that are part of the UUT and those on the test fixture.

The Boundary Scan 400 IO Module

The Boundary Scan 400 IO module includes:

• Hardware module
• Design description files, including PLD BSDL files
• Netlist file
• Documentation to describe connector pin-out and electrical specifications

The cables from the BSIO-400 to the UUT are not provided because each UUT interface is unique.

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