PM7341 datasheet(73/413 Pages) PMC

73 / 413 page

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

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10.1.2 Receive Any-PHY/UTOPIA Slave (RXAPS)

In the receive direction, each S/UNI-IMA-84 transmits cells on an 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.

In all modes, an optional prepend is allowed on the bus. This prepend will

always be set to zero and has no significance to the S/UNI IMA-84 but is

provided for interoperability.

10.1.2.1

UTOPIA Level 2 Multi-Address Slave Mode

In UTOPIA Level 2 Multi-Address Slave mode, the S/UNI-IMA-84 operates as a

31 port multi-PHY with each virtual PHY stored in its own FIFO. UTOPIA L2

Mode limits the S/UNI-IMA-84 to 31 IMA groups or TC links. A 4-bit configuration

this group of 31 ports. Setting RCAEN[0] enables addresses 0 through 7, and

RCAEN[3] enables addresses 24 through 30. This is typically used to allow more

than one slave device to share the Receive UTOPIA master bus. When polled,

the Receive Packet Available (RPA) output indicates whether there is at least one

cell available for transfer from the polled link. Upon selection, the interface

handles data pausing anywhere in the middle of a cell transfer.

PM7341 Datasheet(PDF) 73 Page - PMC-Sierra, Inc