參數(shù)資料
型號(hào): PM2329
英文描述: Telecommunication IC
中文描述: 通信集成電路
文件頁數(shù): 105/162頁
文件大?。?/td> 1581K
代理商: PM2329
Proprietary and Confidential to PMC-Sierra, Inc and for its Customers
Internal Use
Document ID: PMC-2010146, Issue 4
108
PM2329 ClassiPI Network Classification Processor Datasheet
If this bit is
1
, then the PM2329 Field Extraction Engine (FEE) identifies whether the L4 header is TCP
or UDP. If it is TCP, then the FEE extracts the SP, DP and Flag (SYN, FIN and ACK) fields. The RST
bit in the TCP Flags field is also extracted; however this bit is used for updating the TCP state D-Word
only. If the L4 heder is UDP, the FEE extracts the SP and DP fields only.
The following pseudo-code shows the header extraction flow based on the setting of these three control
bits.
If (L3 Header Extraction Enable [62] == 0)
Pre extracted header
else ([62] == 1)
if (Ethernet Framing Enable [61] == 0)
Use supplied L3 offset to extract SIP, DIP and Protocol
if (L4 Header Extraction Enable [60] == 1) AND (Protocol == TCP/UDP)
Compute L4 offset and extract SP, DP and Flags
else
Load SP, DP and Flags with default values
endif
else ([61] == 1)
If (EtherType == IP 0x800)
Parse packet to determine L3 offset and extract SIP, DIP and Prot
Carry out L4 extraction shown above
else
Load SIP, DIP, Protocol, SP, DP and Flags with default values
endif
endif
endif
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