CIRRUS LOGIC makes proprietary VLSI circuits for peripheral controller applications. Current product lines include:
data communications circuits, disk drive controllers, and graphics and display controllers.
A family of products is offered in each line. Each product provides a VLSI solution to a current system design requirement. You will find CIRRUS LOGIC to be different from other semiconductor companies in the way we respond to your needs, with VLSI products that are specific to your applications.
The CIRRUS LOGIC formula combines state-of-the-art IC design automation technology with an understanding of system requirements that is uncommon in the semiconductor industry. The result is better VLSI products, with richer features, brought to market in a time frame that allows you to lead your field. Our products help you compete.
Our internally developed, proprietary S/LATM IC design automation technology is unique in the industry.t It gives us unparalleled capability in bringing highly complex, high performance logic circuits to market in less than half the time of other semiconductor companies. But design technology is only half of the story. It is our knowledge of system requirements, and our commitment to meeting the needs of the system design engineer that makes CIRRUS LOGIC a different kind of semiconductor company. CIRRUS LOGIC offers system level solutions in silicon.
So look at our products. Talk to our systems and applications specialists. Consider the system-specific solutions that we offer, and consider how your products can benefit from the capabilities of a new kind of semiconductor company ... CIRRUS LOGIC.
t U.S. Patent No. 4,293,783
Preliminary product infonnation is still subject to changes as a result of continued product characterization. CIRRUS LOGIC believes the infonnation contained in this document is accurate and reliable. However, it is subject to change without notice. No responsibility is assumed by CIRRUS LOGIC for its use; nor for infringements of patents or other rights of third parties. This document implies no license under patents or copyrights, other than those explicitly stated. The grayscale and shading technology, frame buffer, display scaling, and BIOS memory management of the CL-GD610/620 are Patent Pending. Hercules is a trademark of Hercules Computer Technology. mM, PC XT, PC AT, PSI2. and VGA are trademarks of International Business Machines, Corp. AutoMapTM is a trademark of CIRRUS LOGIC.
CIRRUS LOGIC, Inc. 1463 Centre Pointe Drive, Milpitas, CA 95035 PHONE 408.945.8300 FAX 263.5682 TLX 171918 CIRRUS LOGIC, and S/LA are trademarks of CIRRUS LOGIC, © Copyright, cJlm US LOGIC, Inc. 1989
Cirrus Logic 610/620 Technical Reference Manual
1.0 Introduction
1.1 Scope of Document
This manual provides technical coverage of the CL-GD610/620 Hat paneVCRT Enhanced VGA conttoller chip set. Topics include the modes of operation of the Enhanced VGA con-troller, the major components and registers, the BIOS functions, and programming informa-tion including examples. In addition, detailed information is presented on each of the En-hanced VGA controller registers.
The following defmitions are used throughout this manual:
VGA Industry Standard Video Graphics Array EGA Industry Standard Enhanced Graphics Adapter.
CGA Industry Standard Color Graphics Adapter.
MDA Industry Standard Monochrome Display Adapter.
HGC Hercules TMGraphics Controller.
ECD Industry Standard Enhanced Color Display.
CD : Industry Standard Color Display.
MD Industry Standard Monochrome Display.
PS/2, Display Industry Standard 31.5 kHz Monochrome or Cqlor Display
MFD Multiple-Frequency Color Display (MultiSync™, MultiScan™, etc.) LCD Liquid Crystal Display (typically 640x400/480 dual panel, dual line)
1.2 Chip Revisions Covered
This manual documents the following chip revisions:
1.3 Intended Audience
'.":.-This manual is directed toward the technically sophisticated audience. It assumes the.
reader is familiar with assembly language programming on the 80286/80386 or similar" nii- . croprocessor, and understands the fundamentals of video display tenninology.
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3.0 Register Definition Summary
This chapter presents summary information on the registers of the 610/620 chip-set. The register name is shown first (full name and an abbreviation), along with the pon address and index if applicable. Below that is a figure illustrating the register configuration and a discussion of the register con tents.
Note that the GD610 has been abbreviated to G/A for Graphics/Attribute controller, and the OD620 has been abbreviated to SIC for Sequencer/CRT Controller.
Note: In all register descriptions in this document, unused bits return 0 when read.
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2B41.3B4 CRTC Index (RW) 68451ndu (RW)
2B51.3B5 CRTC Dau (RW) 6845DIlI(RW)
2B61JB6 CRTC Indo (RW) 6845 Indu (RW)
2B71.3B7 CRTC Dau (RW) 6845 DIU (RW)
2B8IJBI Mode Ccnttol (RW)
2B91lB9 Set wahl Pen Rip Flop eN)
2BAIlBA Faw,. CClIlU'OI(W). Display SLllus(R) Display Slam. (R)
2BBI.3BB Cear Liat- Pen Flip Rop (VI) Clear Liahl Pm Flip F1cp (W)
2BC/JBC Set Liahl Pen Rip Rap (VI) 2BOllBO
2BEfJBR
2BF13BP CClIlfiluralion (RW)
2Cll13CO Auribule Controller IndexJDaLl (W). Index (R) 2CI13Cl Attribute Controller Index/DaLl (W), DaLl (R) 2C213C2 Mise Outpul eN), FCIlure (R)
2C31lC3 Mise Output eN). fCllure (R) 2C4!lC4 ScquencerI&tensions Index (RW) 2C51lC5 ScqucnccrI&tensions Dau CR.W) 2C61lC6 Paleue Pixel Muk (RJW)
2C713C7 Pale". Addr Rei R Mode (W). DAC State (R) 2C11JC1 Palcue Address Reli stcr W Mode (R W) 2C91lC9 Palette Da1a (R W)
2CAlJCA GraphiCl2 PosiuClll (VI). Fealure Conlrol (R) 2CBIJCB (Resetved)
2CCJ3CC GraphiCl I Position (VI), Mise Outpul (R) 2CDIlC0 (Reserved)
2CEJ3CE GraphiCl Conuoller tndell (RW) 2CFIlCF GraphiCl ConucUcr Dat.a (R W)
2D01JDO CRTCIncla (RW) 6845 Index (RW)
2D91lD9 Color Select (RW)
2DAJ3DA ~CcmIroI(W), Display St.alus(R) Display Slaws (R)
2DB/30B Clear [jaM Pen Rip Flop (VI) Clear Liahl Pen Aip Flop (W) 2DCJ3OC S« Lipl Pen Aip Aap CN) Sel Lighl Pen Rip Aop (W) 20DI'J00
20EfJOR 20FIlOF
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