ST Header
Op flags
Param
D-Port
S-Port
Key
Cksum
B_id
Bufx
Offset
Sync
B_num
D_id
S_id
MAC header
Opcode, STU sequence number
Connection Parameters (IANA Ports)
Buffer ID
64 bit Memory Address
table(Bufx) + offset
Synchronization of credits/transfers
32 bit Block sequence number
32 bit Transfer sequence numbers
32 B payload for control messages
<= 2^64 B Data messages
User Payload
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