PM7323 Datasheet, PDF (70/219 Pages) PMC-Sierra, Inc – ROUTING CONTROL, MONITORING, & POLICING 200 MBPS

STANDARD PRODUCT
PM7323 RCMP-200
DATASHEET
PMC-960543
ISSUE 2
ROUTING CONTROL, MONITORING, & POLICING
200 MBPS
the cell, and respond by modifying the "PM_activate" or "CC_activate" bit and
sending back an acknowledgment.
9.3.10 Resource Management Cells
Resource Management (RM) cells are identified by PTI=110 for VC-RM cells and
by VCI=6 for VP-RM cells. As a programmable option, VP-RM cells can be
further qualified by PTI=110.
The RCMP-200 does not process the payload of these cells, but simply passes
them to the Output Cell Interface with a translated header. As an option, the
RCMP-200 can copy the cells to the Microprocessor Cell Interface. RM cells are
not included in Performance Management blocks.
9.3.11 Backward OAM and RM Cell Identification
All RCMP-200-generated backward flow OAM cells, and forward and backward
Resource Management cells may be marked for easy identification by an
external processing device. As a configurable option, the RCMP-200 can
overwrite an arbitrary byte in the cell's appended bytes or header with a Cell
Status Information byte. The contents of the Cell Status Information byte consist
of the following:
Table 12 -
Cell Status Information byte
BWDROUTINGTAG[7:3]
CELLID[2:0]
The five-bit BWDROUTINGTAG[4:0] is stored in the VC table at SA[19:16] =
0011, and is only used for generated backward OAM cells (i.e. generated RDI
and Backward Reporting). It overwrites the value normally presented for forward
destined cells, so as to provide a distinction. For example, the
BWDROUTINGTAG may contain the PHY identification for the egress device.
The CELLID[2:0] field is encoded in all cells as follows:
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