PM8621 datasheet(109/184 Pages) PMC

109 / 184 page

NSE-8G™ Standard Product Data Sheet

Preliminary

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

108

Document ID: PMC-2010850, Issue 1

Bit

Type

Function

Default

Bit 31:8

Unused

Bit 7

R/W

TMODE12[1]

Bit 6

R/W

TMODE12[0]

Bit 5

R/W

TMODE11[1]

Bit 4

R/W

TMODE11[0]

Bit 3

R/W

TMODE10[1]

Bit 2

R/W

TMODE10[0]

Bit 1

R/W

TMODE9[1]

Bit 0

R/W

TMODE9[0]

TMODE9[1:0]-TMODE12[1:0]

The time-slot path termination mode select register bits (TMODE9[1:0]-TMODE12[1:0])

configures the mode settings for time-slots 9 to 12 of the T8TE. Time-slots are numbered in

order of transmission in the Incoming TeleCombus stream (ID[7:0]). Time-slot #1 is the first

byte transmitted and time-slot #12 is the last byte transmitted. The setting stored in

TMODEx[1:0] (x can be 1-12) determines which set of TeleCombus control signals are to be

encoded in 8B/10B characters.

In TeleCombus mode, the T8TE encodes TeleCombus control signals such as transport frame

and payload boundaries, pointer justification events and alarm conditions into three levels of

an extended set of 8B/10B characters as well as performing the IEEE mode conversion on

data. The two hierarchical levels are High-order Path Termination (HPT) and Low-order Path

Termination (LPT). For correct operation see the table below:

TMODEx[1]

TMODEx[0]

Mode

Functional Description

Reserved

invalid

HPT level

Use for TelecomBus where V1/V2 pointers must

be preserved

LPT level

Use for SBI336S or TelecomBus with valid V5

but without valid V1/V2 pointers

Reserved

invalid

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