Digital Visual Interface Digital Display Working Group Steve Spina Strategic Initiative Manager Intel Corporation
DDWG Promoters ®
Promoters Promoters form form the the DDWG DDWG Spec Spec Control Control Board Board
DDWG Objectives u
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Establish a universally accepted Industry Standard Interface for digital monitors. Provide for open and royalty-free implementations. Based on TMDS technology from Silicon Image, Inc. Publish an approved Specification Rev. 1.0 by end Mar ‘99
TMDS Link Overview Serial data channels & clock
3 Controls Pixel Clock
C2 Encoder/ Serializer
24 bit data
Clk Gen
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C1 C0 Clk
Receiver Recovery/ De-serializer
Transmitter
Digital Monitor
Clk Gen
Serialized Serialized Digital Digital Data Data Transmission Transmission No No inter-pair inter-pair skew skew issues issues
Dual Link Scalability u
DVI supports a 2nd TMDS link 4 3 additional pairs; uses same clock
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Must insure monitor-system compatibility 4 Link-2 only used above 165 Mpix/sec
“cut-over” frequency u
2-Link Monitors need 1-link formats for all-system compatibility
DVI DVI == B/W B/W Scalability Scalability for for the the Future Future
One connector shell; two implementation choices: DVI-V: “Digital only” (use with legacy VGA) 3 DVI-I: “Integrated” (includes new analog RGB for bundled/workstation systems) 3
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One shell means: Digital monitor plugs into both (following slides)
DVI Connector w/ VGA DVI-V(GA) SYSTEM or GRAPHICS BOARD
Back of PC
Target Use - Mainstream desktop - w/ VGA conn.
MONITOR Legacy VGA
DIGITAL
DVI Connector w/out VGA DVI-I(ntegrated)
SYSTEM or GRAPHICS BOARD
Target Use - Workstn - Small f/f - Bundled sys Requires VGA Adapter
MONITOR Legacy VGA
DIGITAL
New Analog
Interoperability Map VGA
DVI-V(GA)
DVI-I(ntegrated)
SYSTEM SYSTEM WI LL NO TM AT E
MONITOR MONITOR
Fully Interoperable
Legacy VGA
DIGITAL
New Analog
Fully Fully Compatible Compatible System System
Analog / Digital Distribution
Digital Display Ramp LCDs - Plasmas New Technology
Digital CRTs
? Desktop Analog (VGA) Monitors
Today Digital CRTs DDWG Spec Introduced Announced
Time
New Display Technologies Introduced
Analog Legacy REMOVED!!
Standards Compatibility u
VESA P&D and Compaq DFP standards are TMDS-based 3 Same signaling protocol as DVI 3 Same electrical interface
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Can inter-operate by using a connector adapter
Currently Currently shipping shipping TMDS TMDS products products are are DVI DVI compatible compatible
Plug-n-Play: EDID u
EDID Support Required Intent: EDID structure 1.3 (required when completed) 3 Structures 1.2 and/or 2.0 interim 3
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Hot Plug Required on Monitor 3 System side requirment is PCxx driven 3
Using Using VESA VESA P-n-P P-n-P Standards Standards Avoid Avoid New New // Duplicates Duplicates
Image Scaling u
All EDID declared resolutions REQUIRE monitor scaling to full screen (in at least 1 dimension)
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“Readable” display required for 640 x 480 (full screen not required) Scaling not prohibited in Graphics ÄWhen presenting a monitor-declared resolution, default to monitor scalar.
Monitor Monitor Provides Provides Primary Primary Scaling Scaling Support Support
Power Management Full Full ON ON Link Inactive Link Active Power Switch
Mech. Mech. OFF OFF
Active Active OFF OFF
InterIntermediate mediate Timer Expired
Based Based on on “Link “Link Active” Active”Information Information
Future DVI Enhancements u u
Copy protection Protocol support in addition to raster scan ? Selective (addressable) update ? Color depth > 24 bits ? Packet transport (e.g., MPEG-2)
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All new features will be backward compatible NO NO Connector Connector Changes Changes Solid Solid long long term term Standard Standard
Summary u
Web Site: “www.DDWG.org” 3 DDWG info -- Q&A
4 Adopter’s (License) Agreement 4 Completed Rev. 1.0 Spec u
Ready for Implementation 3 Spec completed 3 Connector: production volume 2Q99 3 Silicon: shipping, multi-sourced
