We set this signal for debugging purposes, so don't die if it's absent
(such as in a post-synthesis simulation).
Signed-off-by: Sean Anderson <seanga2@gmail.com>
To make sure that pmd.signal_status comes up at the right time, keep
signal_detect low at the start of simulation. We don't need to set
pmd.rx, because X is the default value (or rather Z is, but it's the
same for our purposes).
Fixes: 1d65661 ("Add pmd")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
The data yielded by the PMD is not really valid until it has made its
way through the pipeline. Delay it until the data is valid. As a side
effect, this should also eliminate any metastability. This is not
necessary for real hardware, but it allows us to to post-synthesis
simulation (where we can't reach in and probe the internal valid
signal).
Additionally, ensure that the state is known by resetting it when we
don't have a signal.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Ensure all inputs are initialized before starting the clocks. This
avoids any problems which might occur due to everything being
initialized at once.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Instead of calculating clock periods based on the desired frequncy,
specify the periods diretly. This silences the following kind of error
caused by floating point rounding:
Unable to accurately represent 8000.000000000001(sec) with the simulator precision of 1e-12
Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
There were two unused variables; remove them. The wrong type of
assignments were used; fix them.
Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Without this state, receiving would immediately go low. However, figure
24-11 shows that receiving should go low only after an additional code
group (the second idle) is received.
Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
When the PMA has no new data for us, idle should be determined based on
raw_bits[11:2]. However, we just calculated that last cycle, so we can
reuse it.
Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
There's no strict requirement for us to handle linke failures immediately.
The PMA's link timer will ensure the signal stays low, so we don't have to
worry about missing it. This fixes some strange Xs during initialization.
Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Sean Anderson