Requester QP's SQ Logic Operation
Start PSN Assignment and PSN Management
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.
Request Packet Opcodes and Packet Sequences
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 ... |
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