uart  <uart_lib.uart.UartMod(inst='uart', libname='uart_lib', modname='uart')>
+-- u_regf  <glbl_lib.regf.RegfMod(inst='uart/u_regf', libname='uart_lib', modname='uart_regf')>
    +------------------------------+
    |                              |
    |  Word    Field    Type       |
    |  ------  -------  ---------  |
    |  ctrl                        |
    |          .ena     EnaType()  |
    |          .strt    BitType()  |
    |                              |
    +------------------------------+
