Configure the core

Changing I-Cache and D-Cache size

I-Cache and D-Cache size can be configured to 0K, 1K, 2K, 4K, 8K, and 16K.
The default configuration of the core is:

16KB I-Cache,
16KB D-Cache
FPU present

The configurations are defined in $PICOJAVAHOME/$PROJECT/design/rtl/defines.h. To change the I-Cache size and D-Cache size you need to edit this file to:

Comment out the lines which specify the default size and
Uncomment the line which specifies the setting you prefer.

No I-Cache
If you wish to specify no I-Cache, you must:

Edit $PICOJAVAHOME/$PROJECT/design/rtl/defines.h
to comment out these lines:

`define ICU_MODULE icu

`define ITAG_MODULE itag_shell

`define ICRAM_MODULE icram_shell

Uncomment all the defines under 0KB I-cache.

No D-Cache
If you wish to specify no D-Cache, you must:

Edit $PICOJAVAHOME/$PROJECT/design/rtl/defines.h
to comment out these lines:

`define DCU_MODULE dcu

`define DTAG_MODULE dtag_shell

`define DCRAM_MODULE dcram_shell

Uncomment all the defines under 0KB D-cache.

Removing the FPU

The steps to configure the core without the floating-point unit (FPU) are:

Edit $PICOJAVAHOME/$PROJECT/design/rtl/defines.h
to comment out the line:

`define FPU_MODULE fpu

Uncomment the following lines:

`define FPU_MODULE fpu_dummy

`define NO_FPU

Back to building the RTL model