Proprietary and Confidential to PMC-Sierra, Inc and for its Customers
’
Internal Use
Document ID: PMC-2010146, Issue 4
127
PM2329 ClassiPI Network Classification Processor Datasheet
4.3.2 E-RAM Words
Indirect Access using: E-RAM Indirect Registers
Access Mode:
Global
E-RAM is accessed by indirect addressing using the E-RAM Indirect Address, Command and Data
Register Set. A single location in the E-RAM is referred to as an E-Word. The E-Word is made up of
several 32-bit words, which are either a C-Word or D-Words. The size of the E-Word depends on the
number of PM2329 devices in the cascade (See E-RAM Indirect Data Register Set).
The format of the C-Word is given below. This must be written to the upper half of the C-Word/D-Word
Register of the E-RAM Indirect Data Register Set.
Control Word
D-Word Present
If this bit is set to
‘
1
’
, it indicates that D-Words corresponding to this OC are present in the E-RAM. If
this OC ends in a match condition, the D-Words will be updated depending on the setting of the D-Word
Update Control field.
If this bit is reset to
‘
0
’
, no D-Word updates are performed based on the result of the current OC.
Note, when OCs are executed from E-RAM, the D-Word fields corresponding to the first C-Words
fetched (to determine the OC to be executed) are updated regardless of the state of this bit provided the
updates are enabled using the Update Control bits in the C-Word.
OC Descriptor Index
This field specifies the index of the descriptor in the OC Descriptor table which will be used for
executing this OC.
Cascade OC Enable
This field specifies which of the eight PM2329 devices in the cascade will participate in the OC. When
the enable bit is set, the corresponding device will execute the OC. If the enable bit is reset, the
corresponding device will not execute the OC. Bit 16 corresponds to PM2329 device 0, bit 23
corresponds to PM2329 device 7 in the Cascade.
Bit
Range
31
30
29:24
23:16
15:12
11:8
7:0
Size
1
1
6
8
4
4
8
Name
Value after
Reset
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Reseved
D-Word Present
OC Descriptor Index
Cascade OC Enable
D-Word Update Control
Branch Opcode
Immediate Address