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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.
92
The binary CELLLEN[3:0] value is the number of bytes appended to the basic
53 byte ATM cell. The maximum cell length is 63 bytes; therefore, a
CELLLEN[3:0] greater than 10 decimal results in 10 appended bytes.
CELLPOST[3:0]:
The CELLPOST[3:0] bits determine the number of words in the input cell
post-pend. The numerical difference between CELLLEN[3:0] and
CELLPOST[3:0] represents the number of words in the pre-pend. It is
inappropriate that CELLPOST[3:0] exceed CELLLEN[3:0].
The binary CELLPOST[3:0] value is the number of bytes post-pended to the
basic 53 byte ATM cell.
ICAINV:
The ICAINV bit selects the active polarity of the ICA[4:1] signals. The default
configuration selects ICA[4:1] to be active high, indicating that a cell slot is
available in the input FIFO when high. When ICAINV is set to logic one, the
ICA[4:1] signals become active low. If the state of the ICAINV bit has been
changed, the input FIFO must be reset via the FIFORST bit in order to
properly initialize the ICA[4:1] outputs.
HECUDF:
The HECUDF bit determines whether or not the HEC/UDF octets are
included in cells transferred over the input interface. When set to logic 1
(default), the HEC and UDF octets are included. When set to logic 0, these
octets are omitted. I.e., if BUS8 is logic 0, the third word of the 27-word ATM
cell is omitted and a 26-word cell (plus appended words) is transferred. If
BUS8 is logic 1, the fifth octet of the 53-octet ATM cell is omitted and a 52-
octet cell (plus appended octets) is transferred.