Currently, there is no expression-string to config bits compiler yet.
For generating the raw config bits, see the demo project in
L1/demos/q6_mod/host/filter_test.cpp.
The layout of the configuration bits is illustrated in the figure below. As the figures shows, the intermediates are always aligned to 32bit boundaries, and comes in little-endian. (In the figure, the intermediates are 48bit wide, and thus occupies one and a half row.)
