Provided is a semiconductor integrated device including a semiconductor memory circuit and a peripheral circuit of the semiconductor memory circuit. One or more clock gating circuits are configured to couple a system clock to a different portion of the integrated circuit device. A packet of user data is fragmented into a plurality of grouping of MAC frames, thus a packet portion can be communicated over a connection. A set of damper vanes extends in the mixing passage and has a mixing position for mixing the flue gases from the inlet passages to supply mixed gas to the outlet passage at relatively high pressure drop but lower temperature if one of the absorbers in not operating. A wet amount of fuel is reduced and HC emission is also reduced. In either embodiment, the expansion region can include at least one opening or a plurality of spaced perforations.