Export some status signals which can be used for LEDs. Hopefully this
will deliver an authentic blinkenlights experience.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
There are several places where memories are used for parametrization
purposes, but I intend them to be synthesized to registers. Silence
warnings about them by explicitly annotating these variables.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
This adds a basic clause 27 repeater (hub), mostly for test purposes.
It's effectively just the state machine in figure 27-4 and nothing else
(e.g. no partitioning or jabber detection). This is surprisingly simple.
Unfortunately, yosys doesn't allow memories in port declarations, even
for systemverilog. This complicates the implementation and testbench,
since we have to do the slicing ourselves. This is particularly awful
for the testbench, since
module.signal[0].value != module.signal.value[0]
and module.signal can't be indexed by slices, and module.signal.value is
big endian (ugh ugh ugh). There is no clean solution here.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Sean Anderson