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STANDARD PRODUCT
PM7323 RCMP-200
DATASHEET
PMC-960543
ISSUE 2
ROUTING CONTROL, MONITORING, & POLICING
200 MBPS
Proprietary and Confidential to PMC-Sierra, Inc.
and for its Customer’s Internal Use.
45
disabled by clearing the GPREPO bit of the Cell Processor Configuration
register. The eight bit UDF field in the SA[19:16]=0011 word is not used. All
other appended octets are sequenced in the extended cell format SCI-PHY data
structure starting with the most significant octet of SA[19:16]=1001. Physical
memory need not be provided for all octets if the SCI-PHY cell is less than 63
octets.
Note that if the RCMP is placed in 8-bit output mode, with the Output Cell
Interface configured for an even length output cell (i.e. an odd number of
appended octets), the RCMP will sequence the appended octets starting with
the second most significant byte.
The header contents of each cell can be altered. The location accessed by
SA[19:16]=1000 contains the new header. The forty bit field contains the entire
header, although not all bits are required for all connections. The VPI portion, the
VCI portion, or both can be replaced with new values recovered from the VC
table once VC identification has been made. Substitution of VPI/VCI contents
can be disabled by clearing the GVPIVCI bit of the Cell Processor Configuration
register. The PTI field is not modified by the translation process. If the
connection is a Virtual Path (i.e. the VCI value in the search key is coded as all
zeros), the VCI field is passed through transparently. As a globally configurable
option, the GFC field in UNI cells can be left unmodified; otherwise, it is replaced
by the four most significant bits of the output header word.
9.3.3 Cell Routing
Each generated reverse flow cell which is presented by the Output Cell Interface
may have the Backward Routing tag of the VC table inserted in its header (i.e.
overwrite a byte of the header). The Backward Routing tag of the VC table is at
SA[19:16] = 0011. The appended byte or header byte to be overwritten is
programmable. As an option, the VPI/VCI combination may equal the incoming
VPI/VCI instead of the translated value.
The destination of each OAM cell depends on the type of OAM cell and whether
the RCMP-200 is the end-point for that particular OAM flow. If the RCMP-200 is
not an end point, the OAM cell is routed to the same destination as the user
cells. If the RCMP-200 is an end point, the default configuration terminates and
processes all OAM cells except Activate/Deactivate and Loopback cells, which
are routed to either the Output Cell Interface or the Microprocessor Cell
Interface.