ARM AMBA NIC-301 Dokumentacja Pobierz pdf (Strona 63)

Programmers Model

ID062813 Non-Confidential

Chip-select Remap

SCC register bits CFGREG4[5:4] control whether CS0 or CS4 is addressed at address

0x00_0000_0000

. See Test chip SCC Register 4 on page 3-19.

Note

Chip-select remap operates only when you map SMC to

0x00_0000_0000

The processor fetches its first instructions from address

0x00_0000_0000

, but the actual memory

read depends on the remapped memory region.

Memory remapping at power-on during run-time

You can configure the remap option at power-on or during run time as follows:

Remapping at power-on

Use the

board.txt

file if the remap option is required when the processor starts

from a reset. The

SCC: 0x000

entry in the

board.txt

file controls the settings for

the SCC register CFGREG4. See Versatile Express

™

Configuration Technical

Reference Manual.

Remapping during run time

Write directly to the SCC register CFGREG0 to change remapping after

power-on. See Test chip SCC Register 4 on page 3-19. See the Boot Monitor

sys_boot.s

file for an example of reconfiguring while running.

Caution

ARM recommends that you use the configuration file rather than directly writing to the control

registers. You must perform remapping during run-time with care. Do not do this when code is

running from the remapped area.

3.2.3 Overview of the memory map for the on-chip peripherals

Figure 3-2 on page 3-7 shows the on-chip peripheral memory map.

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 177 178

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ARM AMBA NIC-301 Dokumentacja Strona 63