Sharing data between PULP and HWPE on HERO

[Adi]

Hi Andreas,

After some debugging, I managed to find the problem.
First, in xne_wrap.sv I believe it's supposed to be: 
.periph_wen       (hwacc_cfg_slave.wen    ) 
And not:
.periph_wen       (~hwacc_cfg_slave.wen    )

In addition, in cluster_clock_gating.sv, the clock gating is not really implemented and I understand this is because you can't do it on FPGA. However, with the existing code, the functionality in hwpe_ctrl_regfile_latch.sv seems to be broken, since it looks like it relies on clock gating.
The consequence is that when I write some value to a certain register, all the registers get this value.
In order to make it work, I used the code for clock gating from pulpissimo. However, I believe this works only in simulations and not on the FPGA. How do I fix the problem?

Edit: 
For now, I fixed it by using the original cluster_clock_gating.sv file (with no clock gating), and changed the condition in the latch_wdata process in hwpe_ctrl_regfile_latch.sv to:

Code:

if ((ClocksxC[k][l] == 1'b1) && (WAddrOneHotxD[k][l]))

Instead of:

Code:

if( ClocksxC[k][l] == 1'b1)

Worked for me in simulation. Haven't tried it on FPGA yet.

Thanks,
Adi