HPS t o FPGA access time measuring

Hi Sam16,

I appreciate that this is a late reply, but thought a reply might be better than nothing.

I found I would get better access using commands like memcpy rather than individual reads, but I haven't done as careful timing as you.

Other options would include setting a pointer, eg

ip_regs_base = *((unsigned long *)(map_base + ....);

and then you can do:

IP_regs[0] = ip_regs_base[0];

and ip_regs_base[0] = 1;

to simplify what the compiler might generate. But memcpy is tailored to moving memory quickly and efficiently, so it will use minimal instructions to do the job.

Cheers,

Simon