AN1178 STMicroelectronics, AN1178 Datasheet - Page 12

• Manufacturer Part Number: AN1178
• Description: 80C32-PSD8XX DESIGN GUIDE
• Manufacturer: STMicroelectronics

AN1178 - APPLICATION NOTE
I/O Logic and User Defined Node Equations. The “I/O Logic Equations” and “User Defined Node
Equations” screens are used to enter equations for the registered logic within the PSD. Since this docu-
ment focuses on issues related to ISP and IAP, registered logic equations are not covered. However, for
more information on entering registered logic equations, refer to the PSDsoft Express User Manual . Also,
see Application Note AN1356 — Design Guide: PSDsoft Express , for a tutorial on implementing logic in the
CPLD.
Click Done and the software will check your design for errors (which there should be no errors using the
template). You should now see the “Design Flow” window:
Click on Additional PSD Settings in the “Design Flow” window and a dialog box will appear.
Additional PSD Settings. There are three functions that can be accomplished in this dialog box:
1. Setting the security bit—blocks all access to the contents of the PSD’s memories by means of JTAG or
2. Specify the IEEE 1149.1 JTAG user code—allows you to enter a 32-bit code which can be used for var-
3. Set the internal memories’ sector protections—allows the individual memory sectors within the PSD to
Click OK and you will see the Design Flow again. Next, we need to fit the design to silicon.
Fitting the Design to Silicon. To fit the design to silicon, click the Fit Design to Silicon box in the De-
sign Flow. PSDsoft Express will compile and synthesize the design and create part of the program data
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a conventional programmer. That is, once the security bit is set, no programmer can read or copy the
configuration or memory contents of the PSD. The only way to erase the security bit is to completely
erase the PSD.
ious functions. Click on the “JTAG/ISP” tab for more details
be write protected to prevent accidental data loss. The MCU/MPU cannot change these settings at run-
time; only a device programmer can alter these settings.