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Implementation of high speed digital channel. High Speed Digital System Lab Spring 2009 1 semester project Instructor: Mony Orbach Students: Pavel Shpilberg Ohad Fundoianu. Topics. Definition Theoretical Background Project targets Block diagram Schematic diagram

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Implementation of high speed digital channel

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Implementation of high speed digital channel

High Speed Digital System Lab

Spring 2009

1 semester project

Instructor: MonyOrbach

Students: PavelShpilberg

OhadFundoianu


Topics

  • Definition

  • Theoretical Background

  • Project targets

  • Block diagram

  • Schematic diagram

  • Programmable parameters

  • Time table


Definition

  • Examining Stratix card ability of GX (protocols and parameters).

  • Testing the channel by checking the distortion of signals along the lines using high speed scope.

  • Implementation of High Speed Serial channel on Stratix 2 GX board.


Theoretical background

  • Transceiver – used for transmitting/receiving data in the PHY.

  • PHY – The physical layer of the OSI model consists of PCS, PMA and PMD - physical medium.

n

m

Serial In

PCS

Digital Section

FPGA

PMA

Analog Section

Serial Out

m

n

  • Applications – Gigabit Ethernet systems, wireless network routers, fiber optic and communication systems.


Noise In Digital Channel

  • Amplitude dependent Noise:

  • CrossTalk:

  • Capacitive & Inductive Coupling

  • Shared Signal Return

  • ISI: Reflections, Oscillations, Inertial Delay.

  • Timing: Skew, Jitter.

  • Power Suppluy Noise.


Independent Noise:

  • Skin Effect

  • Ohmic Loss

  • Dielectric Loss


Block diagram

  • Channel:

  • rate: 6.1Gbps

  • I/O :

  • 8 bit bus

  • max rate: 710 Mbps

Encoding

Serilizer

8

8

input

4

Decoding

Deserilizer

8

8

PLL

output


Schematic diagram

Transmitter

Receiver

2

PLL

8

8

Output

clock

Memory

Memory

HS Scope


Programmable parameters

  • 8/10 B

  • Transmit Buffer

  • Pre-Emphasis

  • Receiver Input Buffer

  • Equalizer

  • PLL/CRU Clock


Time table


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