T8207 Datasheet, PDF (34/158 Pages) Agere Systems – ATM Interconnect

CelXpres T8207
ATM Interconnect
Advance Data Sheet
September 2001
8 Look-Up Table (continued)
Next, the validity of the F5 OAM record is determined by checking its A and I bits. If it is valid, the cell is routed as
described by the OAM routing control (C1, C0) bits. (See the definition for these bits in Section 8.2, Organization.)
If the E bit in the VCI record is not one or if the C1 and C0 bits in the OAM record are zero and one, respectively,
the cell does not receive OAM routing. If the cell is not routed as an OAM cell, information in the VCI translation
record is used to route the cell. The cell’s VPI and VCI are replaced with the VPI and VCI, respectively, in the VCI
record. The most significant 4 bits of the VPI will only be substituted if the global rplc_gfc bit in the direct configura-
tion/control register (address 28h) is set or if the port is configured in NNI mode. The cell bus routing header and
tandem routing header are then added to the cell, and the cell is transmitted on the cell bus.
Note: Unused OAM cell routing records in the LUT memory space can be used for other purposes.
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