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)： 57/162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
60
PM2329 ClassiPI Network Classification Processor Datasheet
configuration is used, a transfer of packet data or packet control information to the Packet Input Buffer
loads all PM2329 devices in the cascade simultaneously.
For further details regarding the Packet Input Buffer size and functionality, refer to the Channel
Assignment Register and Packet Buffer Input Register descriptions in Chapter 4.
The Packet Transfer Phase of processing is not complete until key data is extracted from the newly-
acquired packet(s), including IP/TCP/UDP fields (header fields), and data within the packet at given
offsets which must undergo pattern searches. To extract such data for processing, the Field Extraction
Engine (FEE) accesses the packets in the order in which packet transfers are completed. The FEE transfers
the extracted data fields to the Policy Search Engine (PSE) for classification with respect to a
predetermined subset of the defined Rules.
In addition to the needs of the FEE, the PM2329 Control Unit needs the control information associated
with every packet, in order to start the packet processing operation. This control information defines the
search space in the Rule Memory, the sequence of packet processing operations, the data upon which to
act, and the action to be taken after each step in the packet processing. The control information may come
from the Packet Source (PS) or from an external Packet Processor (PP), through the System Interface. The
control information can also come from the E-RAM, if the OC execution is controlled by E-RAM
sequencing.
OC Processing Phase
Once the packet data has been received, the relevant fields have been delivered to the Policy Search
Engine, and the control and sequencing information is in the hands of the Control Unit, the PM2329 starts
the OC Processing Phase. The Policy Search Engine applies select rules from a master Rules Memory in
the order specified by the Control Unit, to packet header/data it received from the FEE. Application of a
rule is essentially a pattern matching operation. (Section 3.2 describes the Field Extraction Engine in
detail.)
Result Phase
During the Result Phase, the results of successful pattern searches are transferred from the PSE into the OC
Results FIFO. If an applied rule yields a match, the PM2329 uses the Cascade Interface signals and bus to
assert an OC Match signal and return the results of that comparison, with statistical data relating to that
rule, in the Results FIFO. The System Interface allows the external processor access to the results.
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