PM9315 datasheet(71/343 Pages) PMC

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PM9311/2/3/5 ETT1™ CHIP SET

PMC-2000164

ISSUE 3

ENHANCED TT1™ SWITCH FABRIC

Released

Data Sheet

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

PMC-Sierra, Inc.

1.6.2

Use of Label and Type Fields

This section provides detail about the generic 14-bit labels and 4-bit types defined in Table 7, Table 8,

Table 9, and Table 10. In all cases, in multi-bit fields, the MSB is transmitted first. For each segment, the

“Type Field” and “Label Field” are encoded as follows:

Table 7.

Encoding of 4-bit Type Fields

Type[3:0]

Segment Type

Use

0000

Control Packet

Provides for inband control information between the

linecard and the switch core.

0001,...,0110

Reserved for future use

Currently not defined for use.

0111

TDM

TDM service provides preallocated bandwidth at a

regular time interval.

1000,...,1011

Unicast Best-Effort (Priority 0,1,2,3)

Prioritized unicast service where priority 0 is the

highest priority.

1100,...,1111

Multicast Best-Effort (Priority 0,1,2,3)

Prioritized multicast service where priority 0 is the

highest priority.

Table 8.

Usage of the Ingress Request Label_1

Segment Type

Type_1

Encoding of Request 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 Request Label_1 field in all segments (i.e. both data traffic and con-

trol 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)

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