HDMP-1012 Datasheet, PDF(8/42 Page) Agilent(Hewlett-Packard) – 4Low Cost Gigabit Rate Transmit/Receive Chip Set

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

HDMP-1012 Datasheet, PDF (8/42 Pages) Agilent(Hewlett-Packard) – 4Low Cost Gigabit Rate Transmit/Receive Chip Set

◁

DIN

INPUT

SELECT

LIN

FDIS

PH1

CAP0

0.1 ÂµF

CAP1

PHASE /

FREQ

DETECT

FILTER

VCO

INPUT

SAMPLER

FRAME

DEMUX

INTERNAL

CLOCKS

CLOCK

GENERATOR

CLOCK

SELECT

D-FIELD

DECODER

D0..D19

C-FIELD

DECODER

STATE

MACHINE

FLAG

DAV*

CAV*

FF

ERROR

FLAGSEL

LINKRDY*

STAT1

STAT0

Figure 5. HDMP-1014 Receiver Block Diagram.

HDMP-1014 Rx Block

Diagram

The HDMP-1014 receiver was

designed to convert a serial data

signal sent from the HDMP-1012

into either 16,17, 20 or 21 bit

wide parallel data. In doing this,

it performs the functions of

â¢ Clock Recovery

â¢ Data Recovery

â¢ Demultiplexing

â¢ Frame Decoding

â¢ Frame Synchronization

â¢ Frame Error Detection

â¢ Link State Control

Input Select

The input select block determines

which input line is used. In

normal operation (LOOPEN=0),

DIN is accepted as the input

signal. For improved distance

and BER using coax cable, an

input equalizer may be used by

asserting EQEN. By setting

LOOPEN high, the receiver

accepts LIN as the input signal.

This feature allows for loop back

testing exclusive of the

transmission medium.

Phase/Freq Detect

This block compares either the

phase or the frequency of the

incoming signal to the internal

serial clock, generated from the

Clock Select block. The

frequency detect disable pin

(FDIS) is set high to disable the

frequency detector and enable the

phase detector. See HDMP-1014

(Rx) Phase Locked Loop for

more details. The output of this

block, PH1, is used by the filter to

determine the control signal for

the VCO.

Filter

This is a loop filter that accepts

the PH1 output from the Phase/

Freq Detector and converts it into

a control signal for the VCO. This

control signal tells the VCO

whether to increase or decrease

its frequency. The Filter uses the

PH1 input to determine a

proportional signal and an

integral signal. The proportional

signal determines whether the

VCO should increase or decrease

its frequency. The integral signal

filters out the high frequency PH1

signal and stores a historical PH1

output level. The two signals

combined determine the

magnitude of frequency change of

the VCO.

VCO

This is the Voltage Controlled

Oscillator that is controlled by the

output of the Filter. It outputs a

high speed digital signal to the

Clock Select.

580

▷