Cypress Semiconductor FX2LP Informações Técnicas Página 119

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Chapter 5. Memory Page 5-7
Figure 5-3. FX2 External Program/Data Memory Map, EA=1
Figure 5-3 illustrates the 128-pin FX2 memory map when the EA pin is tied high.
The only differ-
ence from Figure 5-2 is that the Main RAM is data memory only, instead of combined code/data
memory.
This allows an off-chip code memory to contain all of the FX2 firmware. In this configura-
tion, the FX2 can begin executing code from off-chip memory immediately after power-on-reset.
FX2 code execution begins at address 0x0000, where the reset vector is located.
Off-chip data memory is partially disabled just as in Figure 5-2, ensuring that off-chip data memory
does not conflict with on-chip data RAM.
7.5 Kilobytes
USB regs and
4K EP buffers
Data (RD,WR)
0.5 Kbytes RAM
Data (RD,WR)*
8 Kilobytes
RAM
Data
(RD,WR)*
E000
E200
1FFF
0000
FFFF
48 KBytes
External
Data
Memory
(RD,WR)
64 KBytes
External
Code
Memory
(PSEN)
Inside FX2 Outside FX2
EA=1
(OK to populate
unused data
memory here--
RD/WR strobes
are not active)
(OK to populate
unused data
memory here--
RD/WR strobes
are not active)
* SUDPTR, USB upload/download, EEPROM boot access
data memory code memory
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