{reg: [
{bits: 2, name: 'op', type: 8, attr: ['2','C1'],},
{bits: 5, name: 'imm[4:0]', type: 4, attr: ['5','0'],},
{bits: 5, name: 'rd/rs1', type: 8, attr: ['5','0'],},
{bits: 1, name: 'imm[5]', type: 8, attr: ['1','0'],},
{bits: 3, name: 'funct3', type: 8, attr: ['3','C.NOP'],},
]}