Released
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Table 9. Usage of the Egress Grant Label_1
Segment Type
Type_1
Encoding of Grant Label_1[13:0]
a
Control Packet
TDM
0000
Rsvd (13), CP-category (1). CP-category = 0 for LCS Control Packets;
CP-category = 1 for CPU Control Packets.
b
c
0111
10xx
MUX (2) , Expansion (2), TDM Tag (10)
b
d
e
Unicast Best-Effort
(Priority 0,1,2,3)
MUX (2) , Expansion (5), Destination Port (5), Destination subport (2)
b
Multicast Best-Effort
(Priority 0,1,2,3)
11xx
MUX (2) , Multicast Tag (12)
a. Reserved. All bits labeled Rsvd must be set to zero.
b. The MUX[1:0] field is placed at the beginning of the Grant Label_1 field in all segments (i.e. both data traffic and control
packets). If this field is not used for a MUX function, it can be used as additional bits for expansion. If not used, it must be
set to zero.
c. TDM Expansion field used in products if the number of TDM slots is increased. If this field is used, the “TDM Tag” field
will increase contiguously. If not used, must be set to zero.
d. Unicast Expansion field used in products if the number of ports is increased. If this field is used, the “Destination Port”
field will increase contiguously. If not used, must be set to zero.
e. If the port has no subports (i.e. if it is connected to a single linecard without multiplexing), this field must be set to zero.
Table 10. Usage of the Egress Payload Label_2
Segment Type
Type_2
Encoding of Payload Label_2[13:0]
a
Control Packet
0000
Rsvd (13), CP-category (1). CP-category = 0 for LCS Control Packets;
CP-category = 1 for CPU Control Packets.
b
c
TDM
0111
10xx
Expansion (7), Source Port (5), Source subport (2)
d
c
Unicast Best-Effort
(Priority 0,1,2,3)
Expansion (7), Source Port (5), Source subport (2)
e
c
Multicast Best-Effort
(Priority 0,1,2,3)
11xx
Expansion (7), Source Port (5), Source subport (2)
a. Reserved. All bits labeled Rsvd must be set to zero.
b. TDM Expansion field used in products if the number of ports is increased. If this field is used, the “Source Port” field will
increase contiguously. If not used, must be set to zero.
c. If the source port has no subports (i.e. if it is connected to a single linecard without multiplexing), this field will be zero.
d. Unicast Expansion field used in products if the number of ports is increased. If this field is used, the “Source Port” field
will increase contiguously. If not used, must be set to zero.
e. Multicast Expansion field used in products if the number of ports is increased. If this field is used, the “Source Port” field
will increase contiguously. If not used, must be set to zero.
68
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
