A40MX02-PL208A ACTEL [Actel Corporation], A40MX02-PL208A Datasheet - Page 14

• Manufacturer Part Number: A40MX02-PL208A
• Description: 40MX and 42MX Automotive FPGA Families
• Manufacturer: ACTEL [Actel Corporation]

JTAG Mode Activation
The JTAG test logic circuit is activated in the Designer
software by selecting Tools and then Device Selection.
This brings up the Device Selection dialog box as shown
in
by clicking the "Reserve JTAG Pins" check box.
explains the pins' behavior in either mode.
Table 1-5 • Boundary Scan Pin Configuration and Functionality
TRST Pin and TAP Controller Reset
An active reset (TRST) pin is not supported; however, MX
devices contain power-on circuitry that resets the
boundary-scan circuitry upon power-up. Also, the TMS
pin is equipped with an internal pull-up resistor. This
allows the TAP controller to remain in or return to the
Test-Logic-Reset state when there is no input or when a
logical 1 is on the TMS pin. To reset the controller, TMS
must be HIGH for at least five TCK cycles.
1 -1 0
Reserve JTAG
TCK
TDI, TMS
TDO
40MX and 42MX Automotive FPGA Families
Figure
1-14. The JTAG test logic circuit can be enabled
BST input; must be terminated to logical HIGH or LOW to avoid floating
BST input; may float or be tied to HIGH. TDI may be tied to TDO of another device
BST output; may float or be connected to TDI of another device
Table 1-5
Checked
v3.1
Figure 1-14 • Device Selection Wizard
Boundary Scan Description Language
(BSDL) File
Conforming to the IEEE Standard 1149.1 requires that
the operation of the various JTAG components be
documented. The BSDL file provides the standard format
to describe the JTAG components that can be used by
automatic test equipment software. The file includes the
instructions that are supported, instruction-bit pattern,
and the boundary-scan chain order. For an in-depth
discussion on BSDL files, please refer to
Format Description
Actel BSDL files are grouped into two categories—
generic and device-specific. The generic files assign all
user I/Os as inouts. Device-specific files assign user I/Os as
inputs, outputs, or inouts.
Generic files for MX devices are available on Actel's website
at http://www.actel.com/techdocs/models/bsdl.html.
application note.
Unchecked
User I/O
User I/O
User I/O
Actel BSDL Files