If the TH_CH_OVERRIDE bit in the CPDMA Control register is clear, then the CPDMA packet transmit channel number is the port 0 hardware switch priority. If TH_CH_OVERRIDE is set, then for packets with a classification match the transmit channel number is the lower three bits of the 6-bit address lookup engine classification match value (THREADVAL[2:0] in ALE register THREADMAPVAL). The FLOW value in the VLAN encapsulation word is all 6 bits of the THREADVAL for classifier matches regardless of the setting of TH_CH_OVERRIDE if the encapsulation word is transferred.