Commit Graph

5 Commits (4d3da0c7e65fc21c6e844a68bba65b747d2b6a2d)

Author SHA1 Message Date
Benjamin Herrenschmidt d2762e70e5 Add option to not flatten hierarchy
Vivado by default tries to flatten the module hierarchy to improve
placement and timing. However this makes debugging timing issues
really hard as the net names in the timing report can be pretty
bogus.

This adds a generic that can be used to control attributes to stop
vivado from flattening the main core components. The resulting design
will have worst timing overall but it will be easier to understand
what the worst timing path are and address them.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 years ago
Benjamin Herrenschmidt 9961d70dfb Improve PLL/MMCM clocks configuration
We can now pass both the input clock and target clock frequency
via generics. Add support for both 50Mhz and 100Mhz target freqs
for both cases.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 years ago
Benjamin Herrenschmidt 79b0b9a046 Fix PLL reset signal name in toplevel
It shouldn't have a _n suffix, it's active positive.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 years ago
Benjamin Herrenschmidt 3ac1dbc737 Share soc.vhdl between FPGA and sim
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 years ago
Benjamin Herrenschmidt a69a93b466 Split FPGA toplevel from soc
This will be useful when we start needing different toplevels for
different boards.

We keep the reset and clock generators in the toplevel as they will
eventually be taken over by litedram when we integrate it, and they
are more likely to change on different system types.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 years ago