AN2125 View Datasheet(PDF) - STMicroelectronics
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'AN2125' PDF : 68 Pages View PDF
uPSD3300 Series Design Guide for DK3300-ELCD Using KEIL
Click "Next" to move on to the "Chip Select Equations"Definition Screen.
7.3 Chip-Select Equations
Now you will see the Chip-Select definition screen (Figure 28). Some of the signals will be
shown in this application note for understanding the different types. You can go through each
one to get the pin definitions. The key signals based upon the Block diagram (Figure 18) are
shown in the following screens:.
Figure 28. Design Assistant Chip select equations (rs0)
1. Click the chip-select signal rs0 for the 8 Kbyte xdata SRAM (see Figure 28)
2. Make sure that its definition matches the memory map in Figure 19.
Note: No page number is specified for rs0 since the SRAM is common to all pages (page
independent). Additional signal qualifiers (8032 control signals _rd, _wr, _psen, and ale)
are NOT needed for internal uPSD chip-selects as this is taken care of in silicon. The
SRAM always defaults to 8032 data space. At any time, you may click the "View" button to
see how you are doing, and a summary will appear.
3. Click on the chip-select csiop (Chip Select I/O Port). This is a band of 256 xdata registers
used to control Turbo uPSD Ports A, B, C, D, the Page Register, power management, and
other functions.
40 of the 256 registers are used (see the complete Turbo uPSD datasheet for register defini-
tions and their address offset from the csiop base address). There is no need to specify addi-
tional signal qualifiers for csiop, and it is not allowed to place csiop on a particular memory
page.
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