PM9313 datasheet(72/343 Pages) PMC

72 / 343 page

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

PM9311/2/3/5 ETT1™ CHIP SET

PMC-2000164

ISSUE 3

ENHANCED TT1™ SWITCH FABRIC

Released

Data Sheet

PMC-Sierra, Inc.

Table 9.

Usage of the Egress Grant Label_1

Segment Type

Type_1

Encoding of Grant Label_1[13:0]

Control Packet

0000

Rsvda (13), CP-category (1). CP-category = 0 for LCS Control Packets;

CP-category = 1 for CPU Control Packets.

a. Reserved. All bits labeled Rsvd must be set to zero.

TDM

0111

MUX (2)b, Expansionc (2), TDM Tag (10)

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.

Unicast Best-Effort

(Priority 0,1,2,3)

10xx

MUX (2)b, Expansiond (5), Destination Port (5), Destination subporte (2)

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.

Multicast Best-Effort

(Priority 0,1,2,3)

11xx

MUX (2)b, Multicast Tag (12)

Table 10.

Usage of the Egress Payload Label_2

Segment Type

Type_2

Encoding of Payload Label_2[13:0]

Control Packet

0000

Rsvda (13), CP-category (1). CP-category = 0 for LCS Control Packets;

CP-category = 1 for CPU Control Packets.

a. Reserved. All bits labeled Rsvd must be set to zero.

TDM

0111

Expansionb (7), Source Port (5), Source subportc (2)

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.

Unicast Best-Effort

(Priority 0,1,2,3)

10xx

Expansiond (7), Source Port (5), Source subportc (2)

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.

Multicast Best-Effort

(Priority 0,1,2,3)

11xx

Expansione (7), Source Port (5), Source subportc (2)

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.

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