Q
Can I place DATA in CODE memory and vice-versa?
A
The ADSP-CM408F (an example package used for explanation) has 384KB of internal
SRAM memory that may be used as CODE or DATA. This is allowed in 64KB chunks of
SRAM that can be configured as either DATA or CODE at a time. However, this
organization is only to facilitate performance, so that SYS Bus (DATA) and I/D
Code buses (CODE) conflicts are avoided. Cortex M4 memory standard allows one
to place CODE in DATA region and vice versa. This is supported in CM40x as
well. This may come handy if user has to deal with small chunks of DATA that
cannot be justified to occupy entire 64KB, which may better used to configure
for CODE although with some memory allocated for DATA. This approach may be
used for CODE placement in DATA as well.