
Chapter 5. Memory Page 5-5
5.4 FX2 Memory Maps
Figure 5-2. FX2 External Program/Data Memory Map, EA=0
Figure 5-2 illustrates the memory map of the 128-pin FX2 with off-chip program and data memory.
The 56- and 100-pin FX2 chips cannot access off-chip memory; the entire memory map for those
chips is illustrated on the left side of Figur e5-2, in the “Inside FX2” column.
7.5 Kilobytes
USB regs and
4K EP buffers
Data (RD,WR)
0.5 Kbytes RAM
Data (RD,WR)*
8 Kilobytes
RAM
Code & Data
(PSEN,RD,WR)*
E000
E200
1FFF
0000
FFFF
48 KBytes
External
Data
Memory
(RD,WR)
56 KBytes
External
Code
Memory
(PSEN)
(OK to populate
unused data
memory here--
RD/WR strobes
are not active)
Inside FX2 Outside FX2
EA=0
* SUDPTR, USB upload/download, EEPROM boot access
(OK to populate
unused data
memory here--
RD/WR strobes
are not active)
(OK to populate
unused program
memory here--
PSEN strobe is
not active)
data memory code memory
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