PM7341 datasheet(69/413 Pages) PMC

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PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7341 S/UNI-IMA-84

DATASHEET

PMC-2000223

ISSUE 4

INVERSE MULTIPLEXING OVER ATM

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

FUNCTIONAL DESCRIPTION

This section describes the function of each entity in the S/UNI-IMA-84 block

diagram. Throughout this document the use of the term “transmit” implies data

read in from the cell interface and sent out the lineside interface. Conversely,

“receive” is used to describe the data path from the lineside interface to the cell

interface.

The term “virtual PHY” refers to a single flow on the Any-PHY/UTOPIA bus. Each

IMA group or a single TC connection is mapped to a virtual PHY. For simplicity,

both an IMA group and a TC connection will be referenced as a group.

Each IMA group can map data to/from multiple links. Each TC group is mapped

to a single link.

The term “link” refers to either: (1) a T1, E1, or DS3 link that is multiplexed onto

the SBI bus or (2) a single T1/E1 link or unchannelized link on the clock/data

interface. When supporting fractional T1/E1 via the Clock/Data interface, the

timeslots that are chosen to be part of the fractional connection are also referred

to as a link.

Within the clock/data interface, the external links are mapped to a contiguous

space identified as Virtual Links. To support multiple fractional TC flows on a

single external signal, a mapping is used to split a single channelized external

signal into multiple Virtual Links. At the per-link FIFOs, the clock/data Virtual Link

naming convention is used synonymously with the Physical Link naming

convention.

10.1 Any-PHY/UTOPIA Interfaces

The ATM cell interfaces are Any-PHY compliant 8/16 bit slave interfaces which

are compatible with the following options:

• Any-PHY Slave

• UTOPIA Level 2, 31-port slave (multi-PHY-mode)

• UTOPIA Level 2, single port slave (single address mode) for receive side only.

PM7341 Datasheet(PDF) 69 Page - PMC-Sierra, Inc