hello，dear ，the systemrdl have keyword msb0，lsb0；i add msb0 to my rdl ，but it do not work，the fields bits sequence not change ，hwo to solve the problem？

[jiangqingliu88]

the regblock also should reverse fields sequnce。

[jiangqingliu88]

i use the other methods resolve the pronlem，the change is struct packed{
struct packed{
logic [11:0] value;
} reserved;
struct packed{
logic [3:0] value;
} port3_role;
struct packed{
logic [3:0] value;
} port2_role;
struct packed{
logic [3:0] value;
} port1_role;
struct packed{
logic [3:0] value;
} port0_role;
struct packed{
logic [3:0] value;
} Switch_role;
} cfg_reg;
so the backdoor is equal to the front door access value。

[amykyta3]

Please provide more details. I do not understand what issue you are having.