As previously described in “RC/UC Connection Establishment” on page 186, the SQ Logic's Start PSN is assigned during QP setup.
As the SQ Logic generates each outbound request packet, it sets the BTH:PSN to the previous PSN + 1.
The valid UC request packet opcodes are shown in Table 18-1 on this page. Since there are no response packets used in this transport service type, no response opcodes are defined.
The valid request packet transmission sequences are defined in Table 18-2 on page 447.
|Bits 7:5||Bits 4:0||Packet Type||Fields That Follow BTH|
|001 UC||00000||SEND First||Data Payload|
|00001||SEND Middle ...|