PM7340-PI datasheet(62/334 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

individual channels. 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.

In the 8- and 16-bit UTOPIA Level 2 Single Address mode, the S/UNI-IMA-8

operates as a single device with a single cell FIFO, with all cells being identified

by their virtual PHY ID (VPHY ID) in an address prepend. The address prepend

may be optionally mapped to the HEC/UDF field in order to maintain the standard

cell length. When the address presented on the Any-PHY/UTOPIA Interface

RADR pins matches a programmable 5-bit configuration register (DEVID), the

RXAPS will respond to polls. In all other cases, the output signals are tristated

which allows other slave devices to respond. When polled, the RPA output

indicates whether there is at least one cell available for transfer from any link.

In the 8- and 16-bit Any-PHY Slave mode, the S/UNI-IMA-8 operates as a single

device with a single cell FIFO, with all cells being identified by their virtual PHY ID

(VPHY ID) in a address prepend. When the address presented on the Any-

PHY/UTOPIA Interface RADR pins matches a programmable 5-bit configuration

signals are tristated which allows other slave devices to respond. When polled,

the RPA output indicates whether there is at least one cell available for transfer

from any link. In Any-PHY mode, data pausing is not supported.

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-8 but is provided

for interoperability.

To support current and future devices, the interface is configurable as either an

Any-PHY or UTOPIA L2 interface. Table 3 summarizes the distinctions between

the two protocols.

Table 3 UTOPIA L2 and Any-PHY Comparison

Attribute

UTOPIA L2

Any-PHY

Latency

RDAT[15:0], RPRTY, and

RSOP are driven or become

high impedance immediately

upon sampling RENB low or

RDAT[15:0], RPRTY, RSOP

and RSX are driven or

become high impedance on

the RCLK rising edge

PM7340-PI Datasheet(PDF) 62 Page - PMC-Sierra, Inc

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