S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Figure 11 Parameters of the Primary and Secondary Keys
PHYID
Field A
Lp 0-6 bits
La 0-17 bits
Lp + La <= 17 bits
Unused
Field B
PHYID
VPI + VCI
0-12 bits
Lb 0-12 bits
6 bits
28 bits
46 bits
The user can program the ATLAS with the length and position parameters of Fields A and B.
The figure below provides a representation of how the ATLAS creates the Primary and Secondary
Search Keys. Field location and length registers are used to select Field A and Field B from the
Routing Word. Field A and the PHY ID are concatenated to form the Primary Search Key. Field
B, the PHY ID, and the VPI/VCI field are concatenated to form the Secondary Search Key.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
75
PMC [ PMC-SIERRA, INC ]
