![](http://datasheet.mmic.net.cn/330000/PM7325_datasheet_16444376/PM7325_201.png)
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
201
OBCIF_PHYID
If this bit is logic 1, then the PHYID field of the VC Linkage Table overwrites a portion of
the prepended bytes of cells routed to the Output Backwards Cell Interface, as shown in Table
38. If this bit is logic 0, then these bits will not be overwritten, but cells sent to the OBCIF
will not be able to be correctly reinserted by an S/UNI-ATLAS-3200 Input BCIF.
OBCIF_Bwd_VCRA
If this bit is logic 1, then the Backwards Direction VCRA field of the VC Table overwrites a
portion of the prepended bytes of cells routed to the Output Backwards Cell Interface, as
shown in Table 38. If this bit is logic 0, then these bits will not be overwritten, but cells sent
to the OBCIF must be able to be searched correctly by the receiving S/UNI-ATLAS-3200.
OBCIF_Cell_Info
If this bit is logic 1, then 9 bits of information about the cell and its associated connection
overwrite a portion of the prepended bytes of cells routed to the Output Backwards Cell
Interface, as shown in Table 38 and Table 39. If this bit is logic 0, then these bits will not be
overwritten.
Xlate_To_OBCIF
If this bit is logic 1, then cells routed to the Output Backwards Cell Interface will be header-
translated as if they were destined to the Output Cell Interface, i.e. as controlled by the
XVPIVCI, XPREPO, XHEC, XUDF, and Cell_Info_to_OCIF bits. The OBCIF_Cell_Info,
OBCIF_PHYID, and OBCIF_Bwd_VCRA bits will still cause overwriting of portions of the
cell. This bit is normally logic 1 when the Search_From_IBCIF bit is logic 1. When this bit
is logic 0, cells routed to the Output BCIF are not translated, and cells generated to the Output
BCIF carry the VPI and VCI programmed into the VPI and VCI fields of the VC Table.
IBCIF_P2_To_HECUDF
When this bit is logic 1, then all cells from the Input Backwards Cell Interface will have the
Prepend/Postpend 2 word of the VC Table inserted into their HEC and UDF. This feature is
used if the HEC and UDF are used as a routing word or identification tag, and cells from the
IBCIF require different treatment from cells from the Input Cell Interface. This bit will
overwrite changes made via the Xlate_From_IBCIF bit.
IBCIF_P2_To_P1
When this bit is logic 1, then all cells from the Input Backwards Cell Interface will have the
Prepend/Postpend 2 word of the VC Table inserted into their Prepend/Postpend 1. This
feature is used if the first Prepend/Postpend word is used as a routing word or identification
tag, and cells from the IBCIF require different treatment from cells from the Input Cell
Interface. This bit will overwrite changes made via the Xlate_From_IBCIF bit.