PM7340-PI datasheet(67/334 Pages) PMC

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PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7340 S/UNI-IMA-8

DATA SHEET

PMC-2001723

ISSUE 3

INVERSE MULTIPLEXING OVER ATM

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

Device Address Pins: RADR(4:0)

Channel Address Pins: RADR(4:0) Device Address Pins: RADR(4:0)

Select Pin: RENB

RX Transfer

Cell Size: 8 bit X 53, 54, 55 or 56

bytes

Cell Size: 8 bit X 53 or 55 bytes

Cell Size: 8 bit X 54 or 56 bytes

Cell Size: 16 bit X 27, 28 or 29

words

Cell Size: 16 bit X 27 or 28 words

Cell Size: 16 bit X 28 or 29 words

Enable Pin: RENB

Channel Address: Prepend or UDF Pause in Cell: w/ RENB

Channel Address: Prepend

10.1.4 ANY-PHY/UTOPIA Loopback

For diagnostic purposes, the capability to loopback all Any-PHY/UTOPIA traffic

back to the Any-PHY/UTOPIA bus is provided. Cells are taken from the Transmit

group FIFOs and placed into the respective Receive Group FIFOs, or to a single

FIFO on a space available basis.

10.2 IMA Sub-layer

10.2.1 Overview

The IMA protocol provides inverse multiplexing of a single ATM stream over

multiple physical links and reassembles the original cell stream at the far-end.

The inverse multiplexing is performed on a cell basis; hence, the IMA protocol is

described as a cell-based protocol. See Figure 9 below.

The protocol is based upon the concept of an IMA frame. An IMA frame is

programmable in size and is delineated by an IMA Control Protocol (ICP) Cell. It

is recommended that the ICP cells of each link in the IMA group be offset from

each other to reduce the notification time of link/group status changes.

The transmitter is responsible for aligning the IMA frames on all links within a

group, and for ensuring that cells are transmitted continuously by adding filler

cells as necessary. To maintain frame alignment in the presence of independently

timed line clocks, a cell based stuffing algorithm is utilized.

Since the IMA frames are aligned on transmission, this allows the receive end to

recover the IMA frames and align them to remove any differential delay between

the physical links.

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