Jameco-electronics Rabbit 3000 Instrukcja Użytkownika Pobierz pdf (Strona 135)

100

101

126 Rabbit 3000 Microprocessor

Figure 8-6. Use of Physical Memory Separate I & D Space Model

In Figure 8-6 arrows indicate the direction in which variables and constants are allocated

as the compile or assemble proceeds. Each of these arrows starts at a constant location in

physical memory. This is important because the Dynamic C debugging monitor needs to

keep a small number of constants and variable in data space and it needs to be able to

access these regardless of the state of the user program. The Dynamic C debugger vari-

ables are kept at the top of the data segment starting at 52k and working down in memory.

The user-program variables are allocated by the compiler starting just below the Dynamic

C debugger data. The Dynamic C constants start at address zero. User constants are allo-

cated stating at a low address just above the Dynamic C constants.

52k

Root

I Space

64k

Constant

D Space

512k

512k+52k

64k+4*n

512k+4*n

Var ia ble

D Space

1024k

Flash memory available

for extended code, constant

data.

Ram memory available.

alloc consts

allocate vars

alloc xdata vars

alloc xcode

xconsts

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 348 349

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