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S/UNI-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
309
PAREN
The PAREN bit is used to indicate whether parity errored cells or packets are marked as
errored. When PAREN is ‘1’, parity-errored cells and packets will be marked. When the
value is ‘0’, errored cells and packets will not be marked. This bit cannot be changed during
operation and can only be changed when RXLRST is logic 1. Packets marked in error will be
marked using RPP_ERR when they are transmitted. Parity errors have no effect on the
processing of ATM cells.
HEC
The HEC bit is used to indicate whether the HEC/UDF word is included in ATM cells. When
the value is ‘1’, the ATM cells contain the HEC/UDF word. When the value is ‘0’, the ATM
cells do not contain the HEC/UDF word. In any event, the HEC is undefined at the ATM
layer, and will not be checked by RxLink. This bit cannot be changed during operation and
can only be changed when RXLRST is logic one.
PRELEN[1:0]
The PRELEN bits are used to indicate the size of the prepend applied to ATM cells. A value
of ‘00’ indicates no prepend word. A value of ‘01’ indicates 1 prepend word. A value of ‘10’
indicates 2 prepend words. A value of ‘11’ is invalid. These bits cannot be changed during
operation and can only be changed when RXLRST is logic one. These bits apply to all PHY
channels. The sum of PRELEN + POSTLEN must not exceed 2, or correct operation is not
guaranteed
.
INBANDADDR
The INBANDADDR bit is used only in POS-PHY mode to indicate whether the in band
address is expected on the interface. This bit is useful in single phy applications where the in
band addressing is optional and the Link Layer device does not send an address in band since
there is only one phy. A setting of ‘1’ means that the address is expected on RDAT when
RSX is asserted. A setting of ‘0’ means that RSX is not used and a PHYID of “000000” is
assigned to all traffic on the POS PHY interface. This bit cannot be changed during operation
and can only be changed when RXLRST is logic one.
POSTLEN[1:0]
The POSTLEN bits are used to indicate the size of the postpend applied to the ATM cells. A
value of ‘00’ indicates no postpend word. A value of ‘01’ indicates 1 postpend word. A value
of ‘10’ indicates 2 postpend words. A value of ‘11’ is invalid. These bits cannot be changed
during operation and can only be changed when RXLRST is logic one. These bits apply to
all PHY channels. The sum of PRELEN + POSTLEN must not exceed 2, or correct operation
is not guaranteed
.