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| 型號(hào)： | PM2329 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 136/162頁(yè) |
| 文件大?。?/td> | 1581K |
| 代理商： | PM2329 |
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Proprietary and Confidential to PMC-Sierra, Inc and for its Customers
’
Internal Use
Document ID: PMC-2010146, Issue 4
139
PM2329 ClassiPI Network Classification Processor Datasheet
Table 30
Masked sub-field and Associated Mask Source
In general, each rule data sub-field can be masked from the next rule data field. However, the following
special cases should be noted.
1.
The first Rule data sub-field RD0 cannot act as the mask field for any other sub-field.
2.
The upper 8 bits of RD3 cannot be masked using this mechanism; however, RD3 (all 16 bits) can be
ignored using appropriate rule programming.
3.
RD4 can never be masked; however, RD4 can be ignored using appropriate rule programming.
4.
The last Rule data sub-field, RD5, is divided into a 4-bit data and a 4-bit mask field. The 4-bit mask
field cannot be used as a data sub-field.
Also note that while a sub-field has been enabled as a mask field, it is still used to generate the result as
specified in the corresponding FCR sub-field. It is up to the user to program the rules and interpret the
results appropriately. Alternatively, if a field is used as a mask field, its corresponding Opcode field could
be set to Match, to effectively ignore the result of the processing of the corresponding processing unit.
5.1.3 Composite Rules
The PM2329 rule set supports creation of Composite rules using the Composite Rule enable bit.
Composite rules combine up to 4 (or less) rules into one wide-policy rule. This composite rule would result
in a compare condition, which is a combination of all the rules that constitute the composite rule. A
composite rule set must lie within the same rule pack.
Note that the same packet data bits are compared against the composite rule. A composite rule generates a
match only if all members of the composite rule match the packet data bits. This makes it possible for the
PM2329 to impose highly complex policies on the packet data.
For all other purposes, a composite rule behaves in the same way as any other single rule. The packet data
bits are compared with each of the member rules, as specified by the individual rule control bits. The
results of the individual compares are logically ANDed for generating the match result of the composite
rule.
In case of a Long Pattern Search OC, the Composite Rule enable bit should be reset to
‘
0
’
, since this OC
uses multiple rules (16 total) by default.
Rule and Packet
Data Field (Size)
RD0 (32 Bits)
RD1 (32 Bits)
RD2 (16 Bits)
RD3 (16 Bits)
RD4 (8 Bits)
RD5 (8 Bits)
Bits Masked
All 32 bits
All 32 bits
All 16 bits
Lower 8 bits only
None
Upper 4 bits
Mask Source
RD1 (32 bits)
RD2 (16 Bits) & RD3 (16 Bits)
RD3 (16 Bits)
RD4 (8 Bits)
None
Lower 4 Bits of RD5
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