This commit makes sure that whenever Vivado is used, the Verilog
define `FPGA_XILINX` is set. This define can be used to enable Xilinx
specific pragmas in the RTL code. It is currently used to implement
the performance counters with DSP slices (incl. integrated output
registers for counter widths <= 32) which helps to save logic resources
and FFs (-7% and -15% when using e.g. 10 counters).
Previously, we had to set this parameter in every single top-level .core
file using Ibex.
Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
- Add a major and minor alert output which can be used by the system to
react to fault injection attacks
Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>
Use Xilinx-specific implementations for primitives, such as RAM and the
clock gate (which will now be implemented using a BUFGCE macro, and no
longer with a latch).
Verified in Vivado synthesis to pick up the Xilinx primitive now.
Move Xilinx specific code into shared folder so it can be re-used by
different examples.
Use the shared RAM code and make use of byte enable signal.
Fixeslowrisc/ibex#144
- Add required signals to top-level
- Propagate error through fetch stages
- Add new exception type
- Update documentation for new exception type
- Resolves issue #109
This change is slighly painful, but a necessary cleanup around the
tracer.
- We now provide a separate core file for the tracer, called
"ibex_tracer.core" (in line with "ibex_tracer.sv"). The core is called
"lowrisc:ibex:ibex_tracer".
- The toplevel wrapper with tracing enabled got renamed to
"ibex_core_tracing.sv", and the core file is correspondingly called
"ibex_core_tracing.core. The core in it is called
"lowrisc:ibex:ibex_core_tracing".
- Finally to keep symmetry, the toplevel of Ibex itself got renamed in
the core file from "lowrisc:ibex:ibex" to "lowrisc:ibex:ibex_core".
This ensures that we have the same name for the core file, the source
entry point, and the core name.
IMPORTANT NOTE:
If you apply this change and use fusesoc, you need to adjust the name of
the core dependency from "lowrisc:ibex:ibex" to
"lowrisc:ibex:ibex_core".
