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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.
104
with the standardized CRC-10 value calculated over the information field. In
this case, the 6 MSBs of the last word are overwriiten with zeros prior to
CRC-10 generation, and hence 6 zeros will be transmiited along with the valid
CRC-10.
UPHDRX:
The header translation (UPHDRX) bit controls the header processing of the
current cell written into the buffer.
If UPHDRX was set to logic 1 prior to assembling the cell in the buffer, the
current cell has its header modified before presentation on the output bus.
The cell is also subject to policing, cell counting, multicasting and OAM
processing just as if had been received through the Input Cell Interface.
Therefore, the header information must correspond to a provisioned virtual
connection, or else the cell is discarded.
If UPHDRX was a logic 0, the current cell is passed to the output without
modification, with the exception that appended bytes may be added or
stripped to ensure a correct cell length for the selected interface. The cell
need not belong to a provisioned connection. The cell is not policed and does
not affect the contents of Forward Monitoring cells and error counts. In other
words, besides presenting the cell on the Output Cell Interface, the RCMP-
200 ignores the existence of the cell.
OLEN[2:0]:
The OLEN[2:0] bits indicate the number of words in the inserted cell that the
microprocessor is about to write. Since valid cell lengths range from 32 words
to 27 words, values of these bits are:
OLEN[2:0] = 111, cell length = 32 words
OLEN[2:0] = 110, cell length = 31 words
OLEN[2:0] = 101, cell length = 30 words
OLEN[2:0] = 100, cell length = 29 words
OLEN[2:0] = 011, cell length = 28 words
OLEN[2:0] = 010, cell length = 27 words
OLEN[2:0] = 001, RESERVED