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LINKER->Linker Command Line Options->Specify External Ram Limits (/XRAM:)
This option specifies the area of external ram available for the program data. The format is:
/XRAM:[low address]:[high address]
[low address] and [high address] should be specified in hexadecimal.
(Do not use an 'H' after the hexadecimal numbers).
The default low address is zero and the default high address is 0FFFFH.
Multiple /XRAM directives can be used to specify discontinuous regions of ram. For example:
tells the linker to use address ranges zero to 0X7FFF and 0XA000 to 0XAFFF.
The / XRAM option is also used to specify switchable xdata ram banks. The ram bank number is appended to the end as follows
/ XRAM:[low address]:[high address]:[bank number]
Bank number may be between 0 and 0XFF and should correspond with the bank number used with the SEGMENT assembler directive.
/XRAM:B000:FFFF:0 /XRAM:B000:FFFF:1 /XRAM:B000:FFFF:2
tells the linker that three ram banks numbered zero, one and two exist each with an address range of 0XB000 to 0XFFFF.