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**WD76C20x   Floppy, RTC, IDE and Support Logic Device       <11/25/91
***Info:
GENERAL DESCRIPTION

The  WD76C20 is  a member  of  the WD7600  chip set  which provides  a
cost-effective,  power-efficient   solution  to  PC   systems  design,
especially those  relating to "lap-top" devices. The  set includes the
WD76C10, the WD76C20, and the WD76C30 as shown in Figure 1-1. Together
these chips  provide all necessary  logic to build a  fully integrated
system board for several  varieties of IBM PC/AT compatibles including
systems using 80286, 80386SX, and 80C286 processors.

As  part  of  this  chip  set, the  WD76C20  provides  these  integral
functions:
o Bus Interface Logic
o IDE Interface
o Chip Select Logic
o Floppy Disk Controller
o Real Time Clock
o Suspend/Resume Logic

The Floppy  Disk Controller (FDC) component  provides necessary timing
and signalling between the host  processor peripheral bus and a floppy
disk drive through a cable connector.

The Real Time Clock  component provides calendar and clock information
for the system.

The IDE Interface  controls buffering between the system's  AT Bus and
PC/AT compatible IDE drive interface.

The  Bus  Interface  Logic  controls  buffering of  data  between  the
system's AT Bus and the WD76C20.

The  Chip Select  Logic section  provides decoding  for  selected chip
functions both within the WD76C20 and on the PC/AT motherboard.

Suspend/Resume  Logic provides  support  for chip  set power-down  and
resume sequences.

***Versions:
WD76C20

***Features:...
**WD76C30x   Perip. Ctrl, Interrupt Multiplex, and Clock Gen <11/18/91...
**WD7615     Desktop Buffer Manager                          <04/15/92...
**WD7625     Desktop Buffer Manager                          <10/01/92...
**WD8120LV   Super I/O [no datasheet]                                ?
**Other Chips:
SYSTEMS LOGIC/PERIPHERAL DEVICES
WD16C451, WD16C551 - Enhanced Asynchronous Communications Element (ACE) with Parallel Port
WD16C452, WD16C552 - Dual Enhanced Asynchronous Communications Element (ACE)
WD16C550             Enhanced Asynchronous Communications Element (ACE) with FIFOs
WD76C10AlLP/LV       ISA-Based System Controller for 80386SX and 80286 Desktop and Portable Compatibles
WD76C20/LV   Floppy Disk Controller, Real Time Clock, IDE Interface, and Support Logic Device 
WD76C30/LV   Peripheral Controller, Interrupt Multiplexer, and Clock Generator Device
WD7710/LP    ISA-Based System Controller with Cache for 80386SX and 80286 Desktop and Portable Compatibles
WD7910/LP    ISA-Based System Controller with Cache for 80386SX and 80286 Desktop and Portable Compatibles

IMAGING DEVICES
ICS90C61A          Dual Video/Memory Clock Generator     
ICS90C63   	   Dual Video/Memory Clock Generator 
ICS90C64   	   Dual Video/Memory Clock Generator 
WD90C00	   	   VGA Controller (8514/A clone, max 1MB, 1024x768x16, 800x600x256)                     
WD90C01 	   8514/A for laptops
WD90C10 	   VGA, 256KB
WD90C11, WD90C11A  Enhanced VGA Controller (max 512KB, 1024x768x16, 800x600x256)
WD90C20, WD90C20A  VGA Flat Panel Display Controller (800x600x16, 640x460x256, 32 shades gray)
WD90C22            VGA Flat Panel Display Controller (800x600x16, 640x460x256, 64 shades gray)
WD90C24/A/A2       SVGA, max 1MB, 1280x1024x16, 1024x768x16, LCD, VESA-LB, 3.3 or 5V
WD90C26            VGA Flat Panel Display Controller
WD90C30 	   High Performance Video Controller (max 1MB, 1024x768x256, 1024x768x16)
WD90C31 	   Accelerator Video Controller (max 1MB, 1024x768x256, 1280x1024x16)
WD90C33            Same as WD90C31 but with, max 2MB, VESA-LB, 1280x1024x256, 1280x1024x16)
WD90C55            VGA LCD Interface
WD90C56            VLBI (Video Local Bus Interface), for WD90C30/31, VESA not mentioned. 
WD9710 		   Pipelined, 32bit core, 64bit RAM, 24bit RAMDAC, PCI/VLB
WD9712 		   similar to WD9710



STORAGE DEVICES
WD10C01A            Winchester Disk Controller
WD10C27	    	    Data Separator
WD33C92A    	    Enhanced SCSI Bus Interface Controller
WD33C93B            Enhanced SCSI Bus Interface Controller
WD33C95A, WD33C96A  Enhanced Single-ended and Differential SCSI Bus Interface Controller
WD37C65C  	    Floppy Disk Subsystem Controller Device 
WD42C22C 	    Winchester Disk Subsystem Controller Device
WD60C318 	    Optical Disk Drive Encoder/Decoder 
WD60C40A  	    Peripheral Cache Manager Device
WD60C80 	    Error Detection and Correction Chip (EDAC)
WD61C23A 	    High Performance Hard Disk Controller
WD61C40A 	    Peripheral Cache Manager Device
WD7000 		    ESDI Controller (16-bit ISA)
WD7193 		    Fast SCSI-II PCI adapter, 33C296A-ZX chip
WD7197 		    Fast Wide version of WD7193
WD7296A 	    Fast Wide SCSI-II (PCI?), possibly WD34C296 chip




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