PM5345 datasheet(71/196 Pages) PMC

71 / 196 page

PM5345 S/UNI-155

DATA SHEET

PMC-930305

ISSUE 4

SATURN USER NETWORK INTERFACE

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

When operating with the byte interleaved demultiplexer, the receive interface

processes an STS-3c/STM-1 streams which has been demultiplexed from a

higher rate stream such as an STS-12/STM-4. In this case, the frame alignment

is known, and the demultiplexer indicates the frame alignment by providing an

appropriate pulse on the FPIN input.

10.15.2

Transmit Interface

The low speed transmit interface is a generic byte wide interface for

interconnection with a downstream parallel to serial converter, or a downstream

byte interleaved multiplexer.

When operating with the parallel to serial converter, the transmit interface

provides scrambled data and a 19.44 MHz clock.

When operating with the byte interleaved multiplexer, the transmit interface

provides an STS-3c/STM-1 stream which is multiplexed to a higher rate stream

such as an STS-12/STM-4. In this case, the transmit interface provides

unscrambled data and a 19.44 MHz clock.

10.16 Drop Side Interface

10.16.1

Receive Interface

The drop side receive interface can be accessed through a generic 16-bit or 8-bit

wide interface.

External circuitry is notified, using the RCA signal, when a cell is available in the

receive FIFO. External circuitry may then read the cell from the buffer as a word

wide stream (along with a bit marking the first word of the cell) at instantaneous

rates of up to 25 MHz.

Two cell data structure options are supported as described in the Receive ATM

Cell Processor block description above.

10.16.2

Transmit Interface

The drop side transmit interface can be accessed through a generic 16-bit or 8-

bit wide interface.

External circuitry is notified, using the TCA signal, when a cell may be written to

the transmit FIFO. The cell is written to the FIFO as a word wide stream (along

PM5345 Datasheet(PDF) 71 Page - PMC-Sierra, Inc