Cypress Semiconductor FX2LP Información técnica Pagina 121

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Chapter 5. Memory Page 5-9
5.6 On-Chip Data Memory at 0xE000-0xFFFF
Figure 5-4. On-Chip Data Memory at 0xE000-0xFFFF
Figure 5-4 shows the memory map for on-chip data RAM at 0xE000-0xFFFF.
512 bytes of Scratch RAM is available at 0xE000-0xE1FF. This is data RAM only; code cannot be
run from it. The 128 bytes at 0xE400-0xE47F hold the four waveform descriptors for the GPIF,
described in Chapter 10. The shaded area from 0xE600-0xE6FF contains FX2 control and status
registers.
Memory blocks 0xE200-0xE3FF, 0xE480-0xE5FF, 0xE700-0xE73F, and 0xE800-0xEFFF) are
reserved; they must not be used for data storage.
The remaining RAM contains the endpoint buffers. These buffers are accessible either as addres-
sable data RAM (via the ‘MOVX’ instruction) or as a FIFO (via the Autopointer, described in Sec-
tion 8.8).
EP2 Buffer (1024)
8051 data (512)
EP1IN (64)
Registers (256)
GPIF waveforms (128)
RESERVED (2048)
FFFF
F000
EFFF
E800
E7FF
E7C0
E77F
EP1OUT (64)
EP0 IN/OUT (64)
UNAVAILABLE (64)
RESERVED (384)
RESERVED (512)
E780
E740
E73F
E700
E6FF
E600
E5FF
E480
E47F
E400
E3FF
E200
E1FF
E000
E7BF
EP4 Buffer (1024)
EP6 Buffer (1024)
EP8 Buffer (1024)
FBFF
F7FF
F3FF
F400
F800
FC00
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