SCU_RAM_COMMAND__A
rc = drxj_dap_read_reg16(dev_addr, SCU_RAM_COMMAND__A, &cur_cmd, 0);
rc = drxj_dap_write_reg16(dev_addr, SCU_RAM_COMMAND__A, cmd->command, 0);
rc = drxj_dap_read_reg16(dev_addr, SCU_RAM_COMMAND__A, &cur_cmd, 0);
status = read16(state, SCU_RAM_COMMAND__A, &cur_cmd);