Re: Nios II/e clone

Altera_Forum · ‎08-12-2014

Hello,

I wrote a Nios II/e CPU clone in verilog.

It takes between 600 and 800 LEs and executes most of the instructions in 4 cycles.

It comes with an ISS and a trace tool. Verilog simulation are possible under the free "verilator" tool.

I am wondering if Altera would allow me to publish this IP.

What do you think ?

Regards,

Frederic

Altera_Forum · ‎08-13-2014

--- Quote Start ---

Hello,

I wrote a Nios II/e CPU clone in verilog.

It takes between 600 and 800 LEs and executes most of the instructions in 4 cycles.

It comes with an ISS and a trace tool. Verilog simulation are possible under the free "verilator" tool.

I am wondering if Altera would allow me to publish this IP.

What do you think ?

Regards,

Frederic

--- Quote End ---

Just a follow-up : I have created an SOPC builder component for Quartus 9.1sp1.

If I activate the "Instruction Custom Master" interface under the Component Editor, the custom SOPC component does not show up under SOPC builder.

Here are the signals declaration in the top level:


    // Nios II Custom Master
    output        ncm_cm_reset,
    output        ncm_cm_clk,
    output        ncm_cm_clk_en,
    output        ncm_cm_start,
    input         ncm_cm_done,
    output   ncm_cm_n,
    output  ncm_cm_dataa,
    output  ncm_cm_datab,
    output   ncm_cm_a,
    output   ncm_cm_b,
    output   ncm_cm_c,
    output        ncm_cm_readra,
    output        ncm_cm_readrb,
    output        ncm_cm_writerc,
    input   ncm_cm_result,

Is this a known bug of Quartus 9.1 ? It looks like I will be obliged to declare the interface as a "Conduit".

Best regards,

Frederic

Altera_Forum · ‎08-14-2014

Hello,

I have added a big endian option in the core.

Is there an easy way to tell GCC to generate big-endian code ?

Regards,

Frederic

Altera_Forum · ‎08-15-2014

Look at the gcc sources, it might need a recompile.

Howver I'm not sure how well non 32-bit Avalon slaves will work on a BE system.

You are likely to end up in the 'mess' of ppc - where io accesses to on-chip resources all need byteswapping.