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Programmer’s Reference
ARM DUI 0125A
© Copyright ARM Limited 1999. All rights reserved.
4-3
Motherboard detect
The nMBDET signal operates as follows:
nMBDET=0 The core module is attached to a motherboard, and accesses in the
address range 0x0 to 0x3FFFF to the boot ROM or SSRAM are
controlled by the REMAP bit.
nMBDET=1 The core module is not attached, and accesses in the address range 0x0 to
0x3FFFF are routed to the SSRAM.
Note
The SSRAM is local, which means that it can only be read by the processor on the same
core module. It provides fast local memory for the local processor and cannot be
accessed by other system bus masters.
Figure 4-1 Effect of remap and motherboard detect
Abort
CM registers
SDRAM
SSRAM
256KB
256MB
272MB
4GB
Standalone
Motherboard
CM registers
SDRAM
Boot ROM
Attached
(after reset)
Motherboard
CM registers
SDRAM
SSRAM
Attached
(after remap)