代码看不懂

tangf

将48 bits的dmac从低到高，按照1bytes的单元push到data.q中
类似于
data_q.push_back(dmac[7:0]);
data_q.push_back(dmac[15:8]);
data_q.push_back(dmac[23:16]);
data_q.push_back(dmac[31:24]);
data_q.push_back(dmac[39:32]);
data_q.push_back(dmac[47:40]);