Hi Folks!

I'm interested in implementing the mb_lite core.
Is it possible to implement this core via the Xilinx EDK?
If yes, what must i do?

Using an open core is interesting because you are not obliged to use a specific EDK.
But if you have experience with such an EDK it is perhaps better to use it. But how to use it is an other question.
Personnaly I use open core because I can synthetize them only with IDE. But I have only experience with 8-bit microcontroller.

2 spider66
You can use MBlite in EDK, but you must create additional modules for PLB bus.

Main interest/positive feature of MBlite - HDL vendor independent processor on WB bus with mb-gcc C compiler from XILINX.EDK ;)
But main negative side of MBlite - very low frequency. I use Xilinx ISE v11.5/XST and get about 14.5ns period for "core_syn/mblite_soc.vhd". This frequency really disappoint me (after reading project docs I thought that I can get 100MHz without problems)..

Hi kuzmi4,

did you manage to work with the Xilinx-SDK (gnu-compiler) and mbLite?
I implemented the PLB-Bus already and everythings looks fine at the first view. Unfortunately I experinced the low speed also (on a Spartan 3E-4 it runs only at 25Mhz).
Another problem is that some commands don't work properly like i described here:

http://opencores.org/bug,view,1945


With this bug i am not able to get any medium size C-project to run.
Do you have any experince with bigger programs?
I am very thankfull for any help!

Regards
Edgar

Hi kuzmi4,

I use the mblite with Xilinx XPS 10.1 and the GNU C - compiler. The environment(PLB - bus) is adapted and can be substituted to the original microblaze.
I use a Spartan 3E-4 and to get the MB-Lite working I had to reduced the clockspeed to 25 MHz.

Did you mange to get any bigger C-project to run properly? I describe a bug here:

http://opencores.org/bug,view,1945

which makes it impossible to get any big program to run.
Do you have any experinece with the Xilinx SDK in combination with MB-Lite?

I'll be thankfull for any help.

Regards,
Edgar

Hi kuzmi4!

Thank you for your answer. Could you or someone else please explain to me what exactly to do to implement the mblite to edk? I haven't got any idea.

Thank you!

Hi Leineweber.
I have no experience in MB-lite and Xilinx EDK/SPS - my primary target was get HDL-based CPU with WB bus (if vendor independent - more better). Like bonus for MB-lite was GCC compiler from Xilinx (and whole C-environment from Xilinx ;) thats why I tried MB-lite in HW).
But because low speed and described bugs - I refused test/use it later.

2 spider66
Like you maybe already understand, Leineweber can describe you whole process.
In 2 words - you need add to MB-lite CPU WB-PLB module, or redesign CPU for get built-in Xilinx bus support.

2 spider66
And almost forget - after you add required modules/changes, you will need integrate it to EDK and set up environment in SPS (I almost 1 year do not use SPS, only EDK, thats why maybe I am wrong in SPS question).

Hi every body,

I want to know if it is possible to implmenet and interface the MB Lite softcore to Microblaze via the Xilinx EDK.

Thanks in advance.

2 makni
yes, it is possible, but why ?
You have original Xilinx MB in EDK/XPS and you can configure it like you want: speed - resources.
Like I can see, primary goal of current CPU - HDL-based CPU with WB bus and GCC compiler from Xilinx (in global: whole C-environment from Xilinx).

Hi,
Thank for your reply.
I think that I should use a bridge PLB to wishbone for connecting the MB Lite to Microblaze.
I have a question about how programming and execute a C code for MBLite on FPGA? because I'm using the EDK and I want to compile and execute a C code to MBLite, knowing that for Microblaze, it is easy because this later support the LMB Bus to connect to the local memory but how can I do this for MB Lite in the EDK?

Thanks in advance.

2 all:
finished MB_Lite system assembling (..+gpio+uart) for Vivado 2015.4, minor changes for *.HDL and *.C files required.
-> rtl/gate-level simulation (with SDF) looks OK

MB_Lite system (..+gpio+uart) + Vivado 2015.4:
-> HW test with KC705 == OK
So, MB_Lite with minor changes works fine not only with ISE-10 but with Vivado 2015.4 also.