addrmap basic {

    reg {
        default sw = rw;
        default hw = r;
        field {} basicfield_a[31:0];
    } basicreg_a;

    reg {
        default sw = rw;
        default hw = r;
        field { sw = r; } basicfield_b[31:16];
        field {} basicfield_c[15:0];
    } basicreg_b;

    reg {
        default sw = r;
        default hw = r;
        field { fieldwidth=1;  } basicfield_d[0:0];
        field {  } basicfield_e[2:1];

    } basicreg_c;

    reg {
        default sw = w;
        default hw = r;
        field { fieldwidth=1;  } basicfield_f[0:0];
        field {  } basicfield_g[2:1];
        field {  } case[5:4]; // collide with C keyword

    } basicreg_d;

    reg {
        default sw = rw;
        default hw = r;
        field { fieldwidth=8; } basicfield_h;
        field { fieldwidth=8; } basicfield_i;
        field { fieldwidth=8; } basicfield_j;
        field { fieldwidth=8; } basicfield_k;
    } basicreg_e;

    reg {
        default sw = rw;
        default hw = r;
        field { fieldwidth=8; sw = w; } basicfield_l;
        field { fieldwidth=8; } basicfield_m;
        field { fieldwidth=8; sw = w; } basicfield_n;
    } basicreg_f;

    reg {
        default sw = rw;
        default hw = r;
        field { fieldwidth=8; sw = r; } basicfield_p;
        field { fieldwidth=8; } basicfield_1;
        field { fieldwidth=8; sw = r; } basicfield_r;
    } basicreg_g;

};