IEC 62889:2015
(Main)Digital video interface - Gigabit video interface for multimedia systems
Digital video interface - Gigabit video interface for multimedia systems
IEC 62889:2015 describes a serial digital interface, gigabit video interface (GVIF) for the interconnection of digital video equipment. The GVIF is primarily intended to carry high-speed digital video data for general usage and is well suited for multimedia entertainment systems in a vehicle. It specifies the physical layer of the interface including transmission line characteristics and electrical characteristics of transmitter and receiver. Mechanical and physical specifications of connectors are not included.
Interface vidéo numérique – Interface vidéo gigabit pour les systèmes multimédias
L'IEC 62889:2015 décrit une interface numérique série, l'interface vidéo gigabit (GVIF) pour l'interconnexion de matériels vidéonumériques. La GVIF est principalement destinée à transporter des données vidéonumériques à grande vitesse pour un usage général et est bien adaptée aux systèmes de divertissement multimédia pour véhicule.
L'IEC 62889:2015 spécifie la couche physique de l'interface, y compris les caractéristiques de la ligne de transmission et les caractéristiques électriques de l'émetteur et du récepteur. Les spécifications mécaniques et physiques des connecteurs ne sont pas incluses.
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IEC 62889
®
Edition 1.0 2015-04
INTERNATIONAL
STANDARD
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Digital video interface – Gigabit video interface for multimedia systems
IEC 62889:2015-04(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2015 IEC, Geneva, Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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International Standards for all electrical, electronic and related technologies.
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---------------------- Page: 2 ----------------------
IEC 62889
®
Edition 1.0 2015-04
INTERNATIONAL
STANDARD
colour
inside
Digital video interface – Gigabit video interface for multimedia systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.40; 33.160.60; 35.200 ISBN 978-2-8322-2543-1
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62889:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 9
4 Architecture . 10
5 Electrical characteristics . 11
5.1 DC electrical specifications . 11
5.2 AC electrical specifications . 12
6 Front-end. 13
6.1 General . 13
6.2 TX front-end . 13
6.3 RX front-end . 13
7 Transition state link . 14
8 Protocol . 15
8.1 General . 15
8.2 Encoder . 15
8.3 Decoder . 17
9 Transmission system and transmission line of electrical characteristics . 17
Annex A (informative) Multiple link application . 19
A.1 Single link application example . 19
A.1.1 Block diagram for single link transmission . 19
A.1.2 Data mapping of single link transmission . 20
A.2 Multiple link application example . 20
A.2.1 Block diagram for 2-pair parallel transmission . 20
A.2.2 Data mapping of 2-pair transmission . 21
Bibliography . 22
Figure 1 – Architecture of the GVIF . 10
Figure 2 – VOD, VOS diagram . 11
Figure 3 – Transmitter eye mask specifications (TP1) . 12
Figure 4 – Front-end block diagram . 13
Figure 5 – Transition state link . 14
Figure 6 – Encoder output diagram . 15
Figure 7 – C format word . 16
Figure 8 – H format word . 16
Figure 9 – Transmission system . 17
Figure 10 – Transmission line tolerance impedance . 18
Figure 11 – Transmission loss . 18
Figure A.1 – Differential single link block diagram . 19
Figure A.2 – Pixel configuration . 20
---------------------- Page: 4 ----------------------
IEC 62889:2015 © IEC 2015 – 3 –
Figure A.3 – Multiple link application block diagram . 20
Figure A.4 – Pixel configuration when using 2-pairs . 21
Table 1 – DC electrical specifications of the transmitter . 11
Table 2 – DC electrical specifications of the receiver . 12
Table 3 – AC electrical specifications of the transmitter . 12
Table 4 – AC electrical specifications of the receiver . 12
Table 5 – 4B5B conversion . 16
Table 6 – VSYNC, HSYNC, DE, CNTL/AUX, SDA, TDA transition and the
corresponding header . 17
---------------------- Page: 5 ----------------------
– 4 – IEC 62889:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL VIDEO INTERFACE –
GIGABIT VIDEO INTERFACE FOR MULTIMEDIA SYSTEMS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62889 has been prepared by subcommittee technical area 4:
Digital system interfaces and protocols, of IEC technical committee 100: Audio, video and
multimedia systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/2193/CDV 100/2298/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
---------------------- Page: 6 ----------------------
IEC 62889:2015 © IEC 2015 – 5 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC 62889:2015 © IEC 2015
INTRODUCTION
This International Standard is based on a standard JEITA CP-6101: Digital monitor interface
GVIF that was originally specified by the Japan Electronics and Information Technology
Industries Association (JEITA).
The gigabit video interface (GVIF) is a serial point to point interface supporting uncompressed
digital video links that was designed to address the needs of automotive navigation and
entertainment systems, etc., to transport base band digital video information. The GVIF
applies low voltage differential signaling (LVDS) technology and makes use of a thin cable
consisting of a single shielded twisted pair of conductors that exhibits high noise immunity
and low EMI, and is optimized for small size and low weight. The GVIF supports display
resolutions ranging from WQVGA through WUXGA with maximum 24 bit per pixel colour video
data, and can transmit base band video signal over cable lengths over 10 m. When paired
with high bandwidth data content protection (HDCP), the GVIF's standard functions and
features address all of the requirements for delivering content protected video from a source
to a video display monitor. Optionally, the GVIF supports audio data transmission and user
data transmission.
The Association of Radio Industry Business (ARIB) refers the GVIF in its standard
ARIB STD-B21 as one of authorized digital video output interfaces.
---------------------- Page: 8 ----------------------
IEC 62889:2015 © IEC 2015 – 7 –
DIGITAL VIDEO INTERFACE –
GIGABIT VIDEO INTERFACE FOR MULTIMEDIA SYSTEMS
1 Scope
This International Standard describes a serial digital interface, gigabit video interface (GVIF)
for the interconnection of digital video equipment. The GVIF is primarily intended to carry
high-speed digital video data for general usage and is well suited for multimedia
entertainment systems in a vehicle.
This International Standard specifies the physical layer of the interface including transmission
line characteristics and electrical characteristics of transmitter and receiver. Mechanical and
physical specifications of connectors are not included.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62315-1:2003, DTV profiles for uncompressed digital video interfaces – Part 1: General
ITU-R BT.601-5, Studio encoding parameters of digital television for standard 4:3 and wide-
screen 16:9 aspect ratios
ITU-R BT.656-5, Interface for digital component video signals in 525-line and 625-line
television systems operating at the 4:2:2 level of Recommendation ITU-R BT.601
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
DE
display enable signal given in IEC 62315-1
3.1.2
HSYNC
display horizontal synchronous signal given in IEC 62315-1
3.1.3
VSYNC
display vertical synchronous signal given in IEC 62315-1
3.1.4
RGB
display red, green, blue colour data input (TX) or output (RX) given in ITU-R BT.601-5 and
ITU-R BT.656-5
---------------------- Page: 9 ----------------------
– 8 – IEC 62889:2015 © IEC 2015
3.1.5
YU(Cb)V(Cr)
display Y, U (Cb), V (Cr) pixel data input (TX) or output (RX) given in ITU-R BT.601-5 and
ITU-R BT.656-5
3.1.6
CNTL/AUX
down-stream user defined signal or audio enable signal
3.1.7
P[23:0]
digital signal data like a 24 bit colour video data such as RGB or YU (Cb) V (Cr) data input
(TX) or output (RX)
3.1.8
GVIF RX
circuit that receives the serial signal from a shielded-pair transmission line, decodes them and
outputs to convert into the parallel video signal
3.1.9
GVIF TX
circuit that receives the parallel video signal, the control signals, and encodes them into serial
data to send a signal by driving a shielded-pair transmission line
3.1.10
LOS
loss of signal
detection signal, asserted when the differential input signal at the receiver cannot receive
3.1.11
RX front-end
front-end block of receiver side
3.1.12
SDA
serial data
down-stream signal
3.1.13
SDATAP
down-stream positive-phase side signal of the differential serial data
3.1.14
SDATAN
down-stream negative-phase side signal of the differential serial data
3.1.15
REFRQP
current source signal for reference clock request from Rx side
3.1.16
REFRQN
current source signal for reference clock request from Rx side as well as REFRQP
3.1.17
SFTCLK
pixel clock
clock for capture of the parallel video data per pixel
-
...
IEC 62889
®
Edition 1.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital video interface – Gigabit video interface for multimedia systems
Interface vidéo numérique – Interface vidéo gigabit pour les systèmes
multimédias
IEC 62889:2015-04(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2015 IEC, Geneva, Switzerland
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International Standards for all electrical, electronic and related technologies.
About IEC publications
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---------------------- Page: 2 ----------------------
IEC 62889
®
Edition 1.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital video interface – Gigabit video interface for multimedia systems
Interface vidéo numérique – Interface vidéo gigabit pour les systèmes
multimédias
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.40; 33.160.60; 35.200 ISBN 978-2-8322-1096-6
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62889:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 9
4 Architecture . 10
5 Electrical characteristics . 11
5.1 DC electrical specifications . 11
5.2 AC electrical specifications . 12
6 Front-end. 13
6.1 General . 13
6.2 TX front-end . 13
6.3 RX front-end . 13
7 Transition state link . 14
8 Protocol . 15
8.1 General . 15
8.2 Encoder . 15
8.3 Decoder . 17
9 Transmission system and transmission line of electrical characteristics . 17
Annex A (informative) Multiple link application . 19
A.1 Single link application example . 19
A.1.1 Block diagram for single link transmission . 19
A.1.2 Data mapping of single link transmission . 20
A.2 Multiple link application example . 20
A.2.1 Block diagram for 2-pair parallel transmission . 20
A.2.2 Data mapping of 2-pair transmission . 21
Bibliography . 22
Figure 1 – Architecture of the GVIF . 10
Figure 2 – VOD, VOS diagram . 11
Figure 3 – Transmitter eye mask specifications (TP1) . 12
Figure 4 – Front-end block diagram . 13
Figure 5 – Transition state link . 14
Figure 6 – Encoder output diagram . 15
Figure 7 – C format word . 16
Figure 8 – H format word . 16
Figure 9 – Transmission system . 17
Figure 10 – Transmission line tolerance impedance . 18
Figure 11 – Transmission loss . 18
Figure A.1 – Differential single link block diagram . 19
Figure A.2 – Pixel configuration . 20
---------------------- Page: 4 ----------------------
IEC 62889:2015 © IEC 2015 – 3 –
Figure A.3 – Multiple link application block diagram . 20
Figure A.4 – Pixel configuration when using 2-pairs . 21
Table 1 – DC electrical specifications of the transmitter . 11
Table 2 – DC electrical specifications of the receiver . 12
Table 3 – AC electrical specifications of the transmitter . 12
Table 4 – AC electrical specifications of the receiver . 12
Table 5 – 4B5B conversion . 16
Table 6 – VSYNC, HSYNC, DE, CNTL/AUX, SDA, TDA transition and the
corresponding header . 17
---------------------- Page: 5 ----------------------
– 4 – IEC 62889:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL VIDEO INTERFACE –
GIGABIT VIDEO INTERFACE FOR MULTIMEDIA SYSTEMS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62889 has been prepared by subcommittee technical area 4:
Digital system interfaces and protocols, of IEC technical committee 100: Audio, video and
multimedia systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/2193/CDV 100/2298/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
---------------------- Page: 6 ----------------------
IEC 62889:2015 © IEC 2015 – 5 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC 62889:2015 © IEC 2015
INTRODUCTION
This International Standard is based on a standard JEITA CP-6101: Digital monitor interface
GVIF that was originally specified by the Japan Electronics and Information Technology
Industries Association (JEITA).
The gigabit video interface (GVIF) is a serial point to point interface supporting uncompressed
digital video links that was designed to address the needs of automotive navigation and
entertainment systems, etc., to transport base band digital video information. The GVIF
applies low voltage differential signaling (LVDS) technology and makes use of a thin cable
consisting of a single shielded twisted pair of conductors that exhibits high noise immunity
and low EMI, and is optimized for small size and low weight. The GVIF supports display
resolutions ranging from WQVGA through WUXGA with maximum 24 bit per pixel colour video
data, and can transmit base band video signal over cable lengths over 10 m. When paired
with high bandwidth data content protection (HDCP), the GVIF's standard functions and
features address all of the requirements for delivering content protected video from a source
to a video display monitor. Optionally, the GVIF supports audio data transmission and user
data transmission.
The Association of Radio Industry Business (ARIB) refers the GVIF in its standard
ARIB STD-B21 as one of authorized digital video output interfaces.
---------------------- Page: 8 ----------------------
IEC 62889:2015 © IEC 2015 – 7 –
DIGITAL VIDEO INTERFACE –
GIGABIT VIDEO INTERFACE FOR MULTIMEDIA SYSTEMS
1 Scope
This International Standard describes a serial digital interface, gigabit video interface (GVIF)
for the interconnection of digital video equipment. The GVIF is primarily intended to carry
high-speed digital video data for general usage and is well suited for multimedia
entertainment systems in a vehicle.
This International Standard specifies the physical layer of the interface including transmission
line characteristics and electrical characteristics of transmitter and receiver. Mechanical and
physical specifications of connectors are not included.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62315-1:2003, DTV profiles for uncompressed digital video interfaces – Part 1: General
ITU-R BT.601-5, Studio encoding parameters of digital television for standard 4:3 and wide-
screen 16:9 aspect ratios
ITU-R BT.656-5, Interface for digital component video signals in 525-line and 625-line
television systems operating at the 4:2:2 level of Recommendation ITU-R BT.601
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
DE
display enable signal given in IEC 62315-1
3.1.2
HSYNC
display horizontal synchronous signal given in IEC 62315-1
3.1.3
VSYNC
display vertical synchronous signal given in IEC 62315-1
3.1.4
RGB
display red, green, blue colour data input (TX) or output (RX) given in ITU-R BT.601-5 and
ITU-R BT.656-5
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3.1.5
YU(Cb)V(Cr)
display Y, U (Cb), V (Cr) pixel data input (TX) or output (RX) given in ITU-R BT.601-5 and
ITU-R BT.656-5
3.1.6
CNTL/AUX
down-stream user defined signal or audio enable signal
3.1.7
P[23:0]
digital signal data like a 24 bit colour video data such as RGB or YU (Cb) V (Cr) data input
(TX) or output (RX)
3.1.8
GVIF RX
circuit that receives the serial signal from a shielded-pair transmission line, decodes them and
outputs to convert into the parallel video signal
3.1.9
GVIF TX
circuit that receives the parallel video signal, the control signals, and encodes them into serial
data to send a signal by driving a shielded-pair transmission line
3.1.10
LOS
loss of signal
detection signal, asserted when the differential input signal at the receiver cannot receive
3.1.11
RX front-end
front-end block of receiver side
3.1.12
SDA
serial data
down-stream signal
3.1.13
SDATAP
down-stream positive-phase side signal of the differential serial data
3.1.14
SDATAN
down-stream negative-phase side signal of the differential serial data
3.1.15
REFRQP
current source signal for reference clock request from Rx side
3.1.16
REFRQN
current source signal for reference clock request from Rx side as well as REFRQP
3.1.17
SFTCLK
pixel clock
clock for capture of the parallel video data per pixel
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IEC 62889:2015 © IEC 2015 – 9 –
3.1.18
TDA
transmit data
down-stream user defined signal
3.1.19
TX front-end
front-end block of transmitter side
3.1.20
UDA
user data
up-stream user defined signal
3.1.21
IRQ
up-stream common-mode reference request current for REFRQP/N
3.1.22
VOS
common-mode voltage amplitude of reference request
3.1.23
VOD
differential voltage amplitude for SDATAP/N
3.1.24
VDD
power supply on the transmitter side
3.1.25
V_SDATAP
single-ended voltage of SDATAP
3.1.26
V_SDATAN
single-ended voltage of SDATAN
3.1.27
TP1
transmitter end point for eye mask specification
3.1.28
normalized differential voltage
voltage of transmitter output point
3.1.29
UI
normalized time unit interval of transmitter output point
3.2 Abbreviations
AC Alternating Current
DC Direct Current
EMI Electro-Magnetic Interference
GVIF Gigabit Video InterFace
LSB Least Significant Bit
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LVDS Low Voltage Differential Signaling
MSB Most Significant Bit
4 Architecture
Figure 1 illustrates the architecture of the GVIF. The fundamental operation of the GVIF is a
simultaneous bi-directional data transmission technology, in which the low voltage differential
signal is transmitted down from the transmitter side to the receiver side, and the common-
mode voltage signal is transmitted up from the receiver side to the transmitter side through a
shielded twisted differential pair cable.
The shielded twisted pair transmission line has the characteristic impedance Z (see
0
Figure 10), the line is terminated to VDD by RT of (50 ± 15) Ω on the transmitter side, and is
terminated carrying differential data in RL of (100 ± 5) Ω on the receiver side.
Receiver side
Transmitter side
Transmission line
REFRQP
Z
req
(UDAP)
VDD
C
RT RT
SDATAP
RL
SDATAN
C
Z
0
SHIELD REFRQN
Z
req
(GND) (UDAN)
IEC
where
RT are the pull-up terminated load resistors on the transmitter side (50 ± 15) Ω;
Z is the characteristic impedance of the shielded twisted pair transmission line;
0
RL is the terminated resistor between differential data lines on the receiver side (100 ± 5) Ω;
C are AC coupling capacitors.
SDATAP/SDATAN are the down-stream positive and negative phases side signals carrying
differential serial data.
REFRQP (UDAP)/REFRQN (UDAN) is the up-stream REFREQ common-mode current signal
or UDA common-mode current user defined data signal. UDAP/UDAN are optional.
SHIELD (GND) is the GND and shielded ground for cable.
Z is a blocking filter for the up-stream signal. It can use resistors or inductors depending on
req
the system implementation.
Figure 1 – Architecture of the GVIF
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IEC 62889:2015 © IEC 2015 – 11 –
5 Electrical characteristics
5.1 DC electrical specifications
The DC electrical specifications of the transmitter side are shown in Table 1, and the DC
electrical specifications of the receiver side are shown in Table 2.
Table 1 – DC electrical specifications of the transmitter
Differential output Common mode voltage Input REFRQ assert Input REFRQ de-
peak to peak (SDATAP/N) current (SDATAP/N) assert current
voltage (SDATAP/N)
(SDATAP/N)
mV V mA mA
Condition: Condition: Condition:
RT = 50 Ω RT = 50 Ω RT = 50 Ω
RL = 100 Ω RL = 100 Ω RL = 100 Ω
IRQ = 0 mA IRQ = 11 mA
Minimum 690 VDD −0,55 VDD −1,2 −2,0
Typical 800
Maximum 910 VDD −0,35 VDD −0,8 −7,3
Single
ended
V_SDATAN
V_SDATAP
VOS
0 V
Differential
ended
VOD
0 V
(V_SDATAP)
– (V_SDATAN)
IEC
Figure 2 – VOD, VOS diagram
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Table 2 – DC electrical specifications of the receiver
Output HIGH current Output LOW current
(REFRQP/N) (REFRQP/N)
mA mA
Minimum −0,1 7,4
Maximum 0,1 11
5.2 AC electrical specifications
The AC electrical specifications of the transmitter side are shown in Table 3 and Figure 3
shows a transmitter end point eye specification (TP1). The AC electrical specifications of the
receiver side are shown in Table 4.
Table 3 – AC electrical specifications of the transmitter
SFTCLK frequency UDA data rate (up-stream) SFTCLK duty factor
MHz Mbit/s %
Minimum 7,6 0,01 40
Maximum 160 2,41 60
Transmitter eye mask
1,0
0,75
0,5
0,25
0,0
–0,25
–0,5
–0,75
–1,0
0 0,2 0,4 0,6 0,8 1
UI
IEC
Figure 3 – Transmitter eye mask specifications (TP1)
Table 4 – AC electrical specifications of the receiver
SFTCLK frequency UDA data rate (up-stream)
MHz Mbit/s
Minimum 7,6 0,01
Maximum 160 2,41
Normalized differential voltage
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IEC 62889:2015 © IEC 2015 – 13 –
6 Front-end
6.1 General
The front-end block diagram of GVIF is shown in Figure 4.
Transmission line
Transmitter side Receiver side
VDD
Down stream receiver
RL
RL
SDATAP
C
RT
SDATAN
Z
0
C
GND
IRQ
IRQ
Down stream driver
Z
Z req
SHIELD req
(GND)
+
Up-stream driver
Up-stream receiver
IEC
Figure 4 – Front-end block diagram
6.2 TX front-end
The TX front-end consists of a termination circuit, a down-stream driver and an up-stream
receiver. The termination circuit consists of 2 resistors RL, and the SDATAP/N differential
signal is pulled up to voltage reference (VDD) with a (50 ± 15) Ω resistor. The down-stream
driver consists of a differential current output circuit that is driven by the serial signal from the
encoder. The up-stream receiver detects the common-mode signal which RX sends through
the shielded twisted pair line. The input to the down-stream driver has two modes. One is the
serialized actual encoded video data input mode and the other is the reference clock signal
for REFREQ hand-shake input mode. These two modes activate depending on the common-
mode signal level. The common-mode signal level is normally high. When a long low level
pulse is detected, the up-stream receiver activates the REFREQ signal, and changes a mode
of the encoder into the reference clock mode. In case of the optional up-stream user data
transmission, the up-stream receiver outputs the common-mode voltage as an UDA signal by
using binary digital data sent to the encoder. In this case, the upper limit of the low pulse time
is 100 µs.
6.3 RX front-end
The Rx front-end consists of AC capacitors, a termination resistor RT (100 ± 5) Ω, a down-
stream receiver and an up-stream driver. The down-stream receiver consists of a differential
input detection circuit which receives the transmission potential differential signal through the
shielded twisted pair line. The up-stream driver drives the up-stream transmission signal
applying a current through the termination resistor Rx through the shielded twisted pair
transmission line. (A recommended transmission system and transmission line for electrical
characteristics is specified in Clause 5.)
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7 Transition state link
The transition state link of GVIF shall meet the procedure described below.
There are two states in the connection link between GVIF TX and GVIF RX. One is the state
transmitting differential signal with a reference clock, the other is the state transmitting the H
format word or the C format word. In the former state, the TX encoder is in the reference clock
output mode and the RX decoder is in the reference clock request mode. In the later state, the
TX encoder changes into the encoder mode and the RX decoder changes into the decoder
mode. The state transition switching diagram of the encoder and the decoder is shown in the
Figure 5.
ＲＸ
ＴＸ
TX
RX
Reference clock
Reference clock
Encoder mode Decoder mode
Output mode Request mode
format word
C/H
State0
State0
REFREQ active
Transition1
REFREQ active
Stat
...
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