PM5347 datasheet(236/302 Pages) PMC

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PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

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

220

Figure 12

VCO

recovered

clock

Phase/Freq

Detector

RRCLK+/-

LF+

LFO

RXD+/-

Pre-

filter

LF-

RAVD2

RAVS2

on-chip

off-chip

OpAmp

RAVD2

2N3904

Table 7

Line Rate

(Mbit/s)

R1 (

Ω±1%)

R2 (

Ω±1%)

C1, C2 min (µF)

RE (

Ω±1%)

155.52

68.1

90.9

4.7

100

51.84

68.1

90.9

100

The capacitors (C1, C2) determine the amount of "peaking" in the jitter transfer

curve. The capacitor values can be ±10%. The capacitors should be non-

polarized because when the S/UNI-PLUS is held in reset, the capacitors are

reverse-biased at approximately 2.0V. Also, for some process extremes, the

capacitors may operate with a D.C. reverse-bias of up to 1.0V.

12.5

ATM Mapping and Overhead Byte Usage

The S/UNI-PLUS processes the ATM cell mappings for STS-3c (STM-1) and

STS-1 as shown below in figures 12 and 13. The S/UNI-PLUS processes the

transport and path overhead required to support ATM UNIs and NNIs. In

addition, the S/UNI-PLUS provides support for the APS bytes, the data

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