PM7350-PI datasheet(21/241 Pages) PMC

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PM7350 S/UNI-DUPLEX

DATA SHEET

PMC-1980581

ISSUE 5

DUAL SERIAL LINK PHY MULTIPLEXER

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

In the clock and data receive direction the S/UNI-DUPLEX performs bit level ATM

cell delineation function. In the transmit direction the S/UNI-DUPLEX can

operate in either bit or frame aligned mode. In frame mode (also called byte

aligned mode) the two wire transmit interface continuously monitors for gaps in

the transmit clock to determine where the frame or byte alignment should occur.

The circuitry assumes that when a gap in the transmit clock is detected this is

either the framing bit position (e.g. the DS-1 framing bit) or an overhead byte

(e.g. ADSL modem). In either case the next clock period after the gap is

assumed to represent the byte alignment position.

In the multiplexer application discussed previously the S/UNI-DUPLEX’s LVDS

interfaces are connected to one or two S/UNI-VORTEX devices. It is also

possible to interface S/UNI-DUPLEX to S/UNI-DUPLEX via the LVDS link. Since

the S/UNI-DUPLEX bus interface can be configured in several ways (clock and

data, 8/16 bits bus master, 8/16 bit bus slave) there are various applications

where two S/UNI-DUPLEX devices can be used “back-to-back” in order to

perform one or more of the following functions:

1. Interfacing a bus master device to another bus master.

2. Interfacing a bus slave device to another bus slave.

3. Converting between 8 bit and 16 bit buses.

4. Off card or off shelf bus extension.

5. Cell delineation (I.432 processing).

6. Protection switching.

Examples of these types of configurations are shown in Fig. 4 and Fig. 5.

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