PM7341 datasheet(70/413 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

10.1.1 Transmit Any-PHY/UTOPIA Slave (TXAPS)

In the transmit direction, each S/UNI-IMA-84 receives cells on the Any-

PHY/UTOPIA L2 compatible interface operating at clock rates up to 52 MHz and

supporting 16-bit and 8-bit wide cells. The S/UNI-IMA-84 operates as a bus

slave only.

Cell transfers are cell-based, that is, an entire cell is transferred from one PHY

device before another is selected. Polling occurs concurrently with cell transfers

to ensure maximum throughput. Data pausing is not supported in Any-PHY

mode. If the TENB is deasserted prior to a complete cell being transferred, the

cell transfer error interrupt will be triggered.

10.1.1.1

UTOPIA Level 2 Multi-Address Slave Mode

In the UTOPIA Level 2 Multi-address Slave mode, the transmit interface of the

S/UNI-IMA-84 appears as a 31 port multi-PHY. An 11-bit configuration register

TCAEN (only 4 bits are used in UL2 mode) controls the response to polling the

individual channels within this group of 31 ports. Setting high on TCAEN[0]

enables addresses 0 through 7, and TCAEN[3] enables addresses 24 through

30. This is typically used to allow more than one slave device to share the

Transmit Any-PHY/UTOPIA master bus.

For UTOPIA L2 Mode, only 31 ports are available, using 31 independent FIFOs.

UTOPIA L2 Mode limits the S/UNI-IMA-84 to 31 IMA groups or TC links. Only

TADR[4:0] are used for polling and selection. Each FIFO will only assert TCA

when polled if it is not in the process of transferring a cell and if there is room in

the FIFO for a complete cell. Unlike Any-PHY, in UTOPIA Mode the virtual PHY

port must first be selected prior to the start of the data transfer. This selection is

done using the same address lines that are used for polling in combination with

the TENB pin.

10.1.1.2

Any-PHY Slave Mode

In the Any-PHY slave mode, the transmit interface of the S/UNI-IMA-84 appears

as a multi-PHY device with 84 ports used for the data path where all ports are

identified in the in-band address. The configuration register TCAEN controls the

response to polling the individual channels within this group of 84 ports. Setting

high on TCAEN[0] enables addresses 0 through 7, and TCAEN[3] enables

addresses 24 through 31. This is typically used to allow more than one slave

device to share the Transmit Any-PHY/UTOPIA master bus.

PM7341 Datasheet(PDF) 70 Page - PMC-Sierra, Inc

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