User`s manual

46 rabbit.com The Rabbit BIOS

several other regions needed for buffers. For simplicity’s sake, none of them are shown here and they are

not reflected in Figure 6-2.)

Figure 6-2 Origins from memory_layout.lib

Each origin declaration adds a little more to the overall mapping. We recommend reading the code in

memory_layout.lib and drawing memory maps like the one in Figure 6-2. This exercise will help to

further your understanding of the complex topic of memory mapping.

Parent Origins

flash

ORG_RAM_START

ram

user_block

xmemcode

rootcode

rootdata

Child Origins

(nest level 1)

Child Origins

(nest level 2)

watcode

ORG_RAM_START

+ ROOTDATA_SIZE

ORG_RAM_START

+ ROOTDATA_SIZE

- WATCHCODESIZE

ORG_FLASH_SIZE

ORG_FLASH_SIZE -

MAX_USERBLOCK_SIZE

ROOTCODE_SIZE

Xmem

Stack

Root Data

Root Code

Physical Space

Logical Space

ORG_RAM_SIZE

Watch Code

User/ID Block

Watch Code

Root Data

Xmem Code

Xmem Data

xmemdata