Primitives that are not planned for implementation for reasons of
belonging to old unsupported chips or representing composite complex IPs
rather than primitives are removed.
Also latches and large MUXes not planned for implementation.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
EMCU is a micro-processor based on ARM Cortex-M3 embedded in the
GW1NSR-4C chip used in the Tangnano4k board.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
We add a BANDGAP primitive used to turn off power to OSC, PLL and other
things on some GOWIN chips.
We also mark this primitive and GSR as keep.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>