AN1356 STMicroelectronics, AN1356 Datasheet - Page 12

• Manufacturer Part Number: AN1356
• Description: PSDSOFT EXPRESS AND PSD4235G2 DESIGN GUIDE
• Manufacturer: STMicroelectronics

AN1356 - APPLICATION NOTE
Figure 9. Page Register Definition
For this simple design, click Next >> or click on the “Chip Select Equations” tab.
Chip Select Equations (system memory map)
Now that the PSD pins are defined, you will need to define the system memory map. This is accomplished
by defining all the chip-selects in the system (both internal to the PSD and external chip-selects).
The three memories inside the PSD are individually selected segment-by-segment when MCU addresses
are presented to the Decode PLD (DPLD). Each internal PSD memory segment has its own individual
chip-select name. For example, the main PSD Flash memory has eight individual chip-selects (one for
each sector) named fs0 – fs7. See the PSD4235G2 data sheet for details. Each PSD memory segment
must be defined in PSDsoft Express if it is to be accessed by the MCU.
We must define the internal PSD memory segment chip-selects: fs0 to fs7, csboot0 to csboot3, rs0, and
csiop to match the memory map of Figure 5. The external chip-select for the LCD module, lcd_e, must
also be defined, as shown in Figure 5.
Your screen should look like the following:
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