PM7324 Datasheet, PDF (436/473 Pages) PMC-Sierra, Inc – SATURN User Network Interface ATM Layer Solution

S/UNI-ATLAS
DATASHEET
PMC-1971154
ISSUE 7
PM7324 S/UNI-ATLAS
S/UNI-ATM LAYER SOLUTION
11.4.2 Ingress Performance Monitoring Activation / Deactivation
When performance monitoring is activated on a connection, there are a number of steps required:
1. Select a PM Session (an address in a selected bank)
2. Set the Fwd_PM0 and Bwd_PM0 bits. The reception of the first Fwd/Bwd PM cells will initiate
a clear of the associated counts.
3. If configuring PM as a source point, all counters associated with Fwd PM generation must be
cleared.
4. Set this PM address in the VC Table, and set the proper PM Active bit.
When performance monitoring is deactivated on a connection, only the proper PM Active bit
needs to be cleared.
11.5 Egress VC Table Operation
The Egress path in the ATLAS does not perform a search on incoming cells. Instead the Egress
path does a simple one-for-one look-up function. The index for the look-up must be part of the cell.
The location and length of the index is programmable.
11.5.1 Initialization Procedure
Upon start-up, at a minimum, the external SRAM (VC Tables) should be initialized. This is done in
the following manner:
1 Set the ESTANDBY input to ensure dedicated access to the RAMs
2 Clear the ACTIVE bit in all locations in each supported VC Table entry. This is done by:
i. Clear all Egress VC Table Record Row registers, 0x2AE-0x2D.
ii. On each pass cycle the value of the Egress VC Table Record Address, register 0x2AB, from
0->MAXVC.
iii. Write a 0x0001 to the Egress VC Table Row Select (only activate row 0).
iv. Set the RWB bit to logic 0 and the WM[3:0] field = “0000” in the Egress VC Table Write Mask
and Access Control register 0x2AC.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC AND FOR ITS CUSTOMERS’ INTERNAL USE 428