ARM IoT Subsystem for Cortex-M Technical Reference Manual: 3.2.1. Remap

3.2.1. Remap

The remapping feature of the bus matrix provides the following remapping options:

REMAP[0]

The Embedded flash memory region represents the maximum supported eFlash size: 512KB. If the size of the actual eFlash banks is 256kB, the upper 256kB can be remapped to the AHB expansion port as follows:

0: 512KB eFlash
1: 256KB eFlash upper 256kbytes mapped to AHB expansion port

REMAP[1]

If SRAM1 is not present the corresponding memory range can be mapped to AHB expansion port as follows:

0: SRAM1 present
1: SRAM1 not available, mapped to AHB expansion port

REMAP[2]

If SRAM2 is not present the corresponding memory range can be mapped to AHB expansion port as follows:

0: SRAM2 present
1: SRAM2 not available, mapped to AHB expansion port

REMAP[3]

If SRAM3 is not present the corresponding memory range can be mapped to AHB expansion port as follows:

0: SRAM3 present
1: SRAM3 not available, mapped to AHB expansion port

The PPB address region of the Cortex-M3 memory map is assigned to the default slave of the MTX thus returns SLVERR response.

Table 3.1. Code and SRAM regions

Region	Start	End	Peripheral	Size	AHB bus matrix	Remap				Comment
	Address	Address	name		port	3	2	1	0
Code	`0x0`	`0x0003FFFF`	eFlash 2x128K	256K	TARG_FLASH0	-	-	-	-	Actual size is implementation defined
	`0x00040000`	`0x0007FFFF`	eFlash 2x256K	256K	TARG_FLASH0	-	-	-	0	Implementation defined
	`0x00040000`	`0x0007FFFF`	AHB Expansion	2x128K	TARG_EXP1	-	-	-	1	-
	`0x00080000`	`0x01FFFFFF`	AHB Expansion	511M	TARG_EXP1	-	-	-	-	-
SRAM	`0x20000000`	`0x20007FFF`	SRAM0	32K	TARG_SRAM0	-	-	-	-	Bit band region
	`0x20008000`	`0x2000FFFF`	SRAM1	32K	TARG_SRAM1	-	-	0	-	Bit band region
	`0x20008000`	`0x2000FFFF`	AHB Expansion	32K	TARG_EXP1	-	-	1	-	Bit band region
	`0x20010000`	`0x20017FFF`	SRAM2	32K	TARG_SRAM2	-	0	-	-	Bit band region
	`0x20010000`	`0x20017FFF`	AHB Expansion	32K	TARG_EXP1	-	1	-	-	Bit band region
	`0x20018000`	`0x2001FFFF`	SRAM	32K	TARG_SRAM3	0	-	-		Bit band region
	`0x20018000`	`0x2001FFFF`	AHB Expansion	32K	TARG_EXP1	1	-	-		Bit band region
	`0x20020000`	`0x3FFFFFFF`	AHB Expansion	511M	TARG_EXP1	-	-	-	-	Bit band region `0x20020000` to `0x200FFFFF` Bit band alias `0x22000000` to `0x23FFFFFF`

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