AN1177 STMicroelectronics, AN1177 Datasheet - Page 14

• Manufacturer Part Number: AN1177
• Description: P51XA-PSD8XX DESIGN GUIDE
• Manufacturer: STMicroelectronics

AN1177 - APPLICATION NOTE
one device is in the JTAG chain. If you have more than one device, refer to the PSDsoft Express User
Manual . For single device JTAG chains, the window will look similar to the following one:
To use this window, ensure that the correct programming data file and PSD device appear in Step 1. For
Step 2, select the desired operation, the regions of the PSD that the operation affects, and the number of
JTAG pins (4 or 6) to use on the circuit board.
Before you perform the selected operation, click the Properties… button. This dialog box allows you to
do the following:
Set Port Pins: with this screen, you can set up the PSD’s I/O pins during JTAG operations. The default
(except for the JTAG pins) is Input, which is usually fine for most pins. (Note that the PSD will not respond
to any non-JTAG I/O.) However, sometimes it may be desirable to set a pin or pins to output during JTAG.
For example, if you have chip-select signal being generated from the PSD that selects a device that po-
tentially could drive signals on the JTAG lines (if you are multiplexing the pins), you would want that chip-
select to be inactive during the JTAG operation.
JTAG-ISP Attributes: this screen allows you to view the device name and Instruction Register length. This
information may be useful to other design programs.
User Code: basically, by clicking on the “User Code” tab, you are provided with a space to enter an IEEE
1149.1 User Code that will be compared to the value previously entered in the “Additional PSD Settings”
screen.
Once you are satisfied with your property settings, click OK to return to the “JTAG-ISP Operations” win-
dow. You can now perform the selected operation by clicking Execute.
Before you leave this screen, you may wish to save your JTAG configuration. This can be done in Step 3
by clicking on the Save button and specifying a file name. This file can be used next time by clicking the
Retrieve button.
Programming with PSDpro. Ensure that the PSDpro device programmer is connected to your PC’s par-
allel port. Click on the ST Conventional Programmers box in the Design Flow window. You will see this:
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