PM7324 Datasheet, PDF (114/473 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
The relevant GFR fields in the Ingress VC Table are the GFR, bit location 63 at ISA[19:16]=0101,the
GFR State, bit location 48 at ISA[19:16]=0100, the CLPCC_EN, bit 63 at ISA[19:16]=0001, the
Remaining Frame Count at ISA[19:16]=0101 and the Maximum Frame Count at ISA[19:16]=1110.
They are described below:
Name
Description
CLPCC_EN
Indicates that the CLP Conformance Check is enabled on a
connection which is subject to GFR policing. If the start of
message cell was a CLP=0 cell, then the reception of any CLP=1
cell shall cause that cell to be discarded and the packet to be
partially-packet-discarded.
GFR
If this bit is a logic 1, the will utilize the GFR policing as described
above. If this bit is logic 0, the connection will not use the GFR
policing, rather it will use the normal cell-based policing described
previously.
GFR State[2:0]
The GFR State is an internally maintained state variable that
identifies the state of the connection during GFR policing. This
field is cleared each time an EOM is received. The state
encoding is as follows:
000: Start of packet.
001: Tag Entire Packet.
010: Partial Packet Discard.
011: Disable tagging for current packet (set if the first CLP0 cell
of a frame is compliant to the MCR policing instance).
100: Complete Packet Discard
101: Partial Packet Discard with Tagging (packet was initially
being tagged, then entered PPD discard).
110-111: Reserved
Remaining Frame
Count[10:0]
The Remaining Frame Count holds the number of cells received
for the current frame. This value is only used when the MFL
conformance test is enabled. The count is loaded with the
Maximum Frame Length Field at the End of Message cell. The
value then decrements with each cell received in the new frame.
Maximum Frame
Length[10:0]
The Maximum Frame Length field is a user programmable field to
hold the maximum permissible frame length. Maximum Frame
Length field is used when performing the MFL Conformance Test
of the Generic Frame Rate policing. Setting the MFL bit in the
Ingress Cell Processor Configuration 2 register 0x238 to logic 1
enables the field. Setting this field to all zeros disables the MFL
conformance test when the MFL bit, is set to logic 1.
When GFR policing is enabled, the Ingress VC Table must be configured such that the PCR
conformance test is performed by GCRA1 (I1, L1, Action1) and the MCR/SCR conformance test is
performed by GCRA2 (I2, L2, Action2).
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC AND FOR ITS CUSTOMERS’ INTERNAL USE 106