A42MX36-PL100ES 查看數據表（PDF） - Actel Corporation

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A42MX36-PL100ES

40MX and 42MX FPGA Families

Actel Corporation 

40MX and 42MX FPGA Families

JTAG Mode Activation

The JTAG test logic circuit is activated in the Designer

software by selecting Tools -> Device Selection. This

brings up the Device Selection dialog box as shown in

Figure 1-15. The JTAG test logic circuit can be enabled by

clicking the "Reserve JTAG Pins" check box. Table 5

explains the pins' behavior in either mode.

Figure 1-15 • Device Selection Wizard

Table 5 • Boundary Scan Pin Configuration and Functionality

Reserve JTAG

Checked

Unchecked

TCK

BST input; must be terminated to logical HIGH or LOW to avoid floating

User I/O

TDI, TMS

BST input; may float or be tied to HIGH

User I/O

TDO

BST output; may float or be connected to TDI of another device

User I/O

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.

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 Actel BSDL Files

Format Description application note.

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.

1-12

v6.0

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