How Physical Address is decided?
Refer to AHB bus specification
An example slave
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0479b/BABBDJBB.html
Slave Multiplexer ( & AHB Decoder)
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0479b/BABBDJBB.html
All the SoC peripheral Addressing logic is in the AHB address decoder and multiplexer.
About Chip Select
http://users.cis.fiu.edu/~downeyt/cda4101/chipselect.html
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