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**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:...
***Features:...
**82496/491     Cache Controller / Cache RAM (for P5 Pentium) 03/22/93...
**82497/492   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
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*SIS...
**540            (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99
***Info:
The  single  chipset, SiS540,  provides  a  high performance/low  cost
Desktop solution  for the Super Socket  7 series CPUs  based system by
integrating a  high performance North Bridge,  advanced hardware 2D/3D
GUI  engine  and  Super-South  bridge. In  addition,  SiS540  provides
system-on-chip solution  that complies  with Easy PC  Initiative which
supports Instantly Available/OnNow  PC technology, USB, Legacy Removal
and Slotless Design and FlexATX form factor.

By integrating  the Ultra-AGP technology and  advanced 128-bit graphic
display interface, SiS540  delivers high performance and up  to 2 GB/s
memory  bandwidth. Furthermore, SiS540  provides powerful  slice layer
decoding DVD  accelerator to improve the DVD  playback performance. In
addition to providing the  standard interface for CRT monitors, SiS540
also  provides  the Digital  Flat  Panel  Port  (DFP) for  a  standard
interface  between  a  personal  computer  and a  digital  flat  panel
monitor.  To  extend functionality and flexibility,  SiS also provides
the  "Video Bridge"  (SiS301) to  support the  NTSC/PAL  Video Output,
Digital  LCD Monitor  and  Secondary CRT  Monitor,  which reduces  the
external Panel  Link transmitter and TV-Out encoder  for cost effected
solution. SiS540  also adopts  Share System Memory  Architecture which
can flexibly utilize the frame buffer size up to 64MB.

The  "Super-South Bridge"  in  SiS540 integrates  all peripheral  con-
trollers/accelerators/interfaces.   SiS540  provides  a total  commun-
ication   solution  including  10/100Mb   Fast  Ethernet   for  Office
requirement.  SiS540 offers AC’97  compliant interface  that comprises
digital audio engine with 3D-hardware accelerator, on-chip sample rate
converter, and  professional wavetable  along with separate  modem DMA
controller.   SiS540 also provides  interface to  Low Pin  Count (LPC)
operating at 33 MHz clock which is  the same as PCI clock on the host,
and dual USB  host controller with four USB  ports that deliver better
connectivity and 2 x 12Mb bandwidth.

The built-in fast PCI IDE controller supports the ATA PIO/DMA, and the
Ultra DMA33/66 function that supports  the data transfer rate up to 66
MB/s. It provides  a separate data path for two  IDE channels that can
eminently improve the performance under the multi-tasking environment.

***Configurations...
***Features:...
**55x            SoC (System-on-chip)                        <03/14/02...
**
**Support chips:
**85C206     Integrated Peripheral Controller [no datasheet]         ?...
**5595       Pentium PCI System I/O                          <12/24/97...
**950        LPC I/O                                         <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
**W83977F/G/AF/AG WINBOND I/O (Multi I/O)                          c97
***Info:
GENERAL DESCRIPTION

This data sheet covers  two products: W83977F/G, and W83977AF/AG whose
pin assignment, and most of the functions are the same. W83977AF/AG is
an advanced version of W83977F/G featuring the FIR function.

W83977F/G,  W83977AF/AG  are  evolving  products from  Winbond’s  most
popular I/O chip  W83877F -- which integrates the  disk drive adapter,
serial  port  (UART),  IrDA   1.0  SIR,  parallel  port,  configurable
plug-and-play  registers  in one  chip  ---  plus additional  powerful
features: ACPI, 8042 keyboard controller with PS/2 mouse support, Real
Time  Clock,  14  general  purpose  I/O  ports,  full  16-bit  address
decoding, TV  remote IR (Consumer  IR, supporting NEC,  RC-5, extended
RC-5, and  RECS-80 protocols).  In addition,  W83977AF/AG provides the
functions of IrDA 1.1 (MIR for 1.152M bps or FIR for 4M bps).

The disk  drive adapter functions of W83977F/G,  W83977AF/AG include a
floppy  disk drive  controller compatible  with the  industry standard
82077/  765, data  separator, write  pre-compensation  circuit, decode
logic, data  rate selection, clock generator,  drive interface control
logic,  and  interrupt/  DMA   logic.  The  wide  range  of  functions
integrated onto the W83977F/G,  W83977AF/AG greatly reduces the number
of components  required for interfacing  with floppy disk  drives. The
W83977F/G, W83977AF/AG supports up to four 360K, 720K, 1.2M, 1.44M, or
2.88M disk drives  and data transfer rates of 250  Kb/s, 300 Kb/s, 500
Kb/s,1 Mb/s, and 2 Mb/s.

The W83977F/G, W83977AF/AG provide two high-speed serial communication
ports (UARTs),  one of  which supports serial  Infrared communication.
Each UART  includes a 16-byte  send/receive FIFO, a  programmable baud
rate  generator, complete  modem control  capability, and  a processor
interrupt  system. Both  UARTs  provide legacy  speed  with baud  rate
115.2k and provide advanced speed  with baud rate 230k, 460k, and 921k
bps  which support  higher speed  modems.  W83977AF/AG  alone provides
independent 3rd UART (32-byte FIFO) dedicated for IR function.

The  W83977F/G, W83977AF/AG  supports one  PC-compatible  printer port
(SPP), Bi-directional  Printer port  (BPP) and also  Enhanced Parallel
Port (EPP)  and Extended Capabilities Port (ECP).  Through the printer
port  interface  pins, also  available  are:  Extension  FDD Mode  and
Extension 2FDD Mode allowing one or two external floppy disk drives to
be connected.

The   configuration  registers   support   mode  selection,   function
enable/disable,  and power down  function selection.  Furthermore, the
configurable  PnP  features  are  compatible  with  the  plug-and-play
feature demand of Windows 95TM, which makes system resource allocation
more efficient than ever.

W83977F/G,  W83977AF/AG  provides  functions  that  comply  with  ACPI
(Advanced Configuration  and Power Interface),  which includes support
of  legacy and  ACPI  power  management through  SMI  or SCI  function
pins. W83977F/G, W83977AF/AG also  has auto power management to reduce
power consumption.

The keyboard  controller is based  on 8042 compatible  instruction set
with a 2K Byte programmable ROM and a 256-Byte RAM bank. Keyboard BIOS
firmware is available with  optional AMIKEY-2, Phoenix MultiKey/42, or
customer code.

The  W83977F/G, W83977AF/AG  provides a  set of  flexible  I/O control
functions to the system designer  through a set of General Purpose I/O
ports. These GPIO ports may serve as simple I/O or may be individually
configured to provide a pre-defined alternate function.

W83977F/G,  W83977AF/AG is made  to fully  comply with  Microsoft PC97
Hardware Design Guide. IRQs, DMAs, and I/O space resource are flexible
to adjust to meet ISA PnP requirement. Full 16-bit address decoding is
also  provided. Moreover W83977F/G,  W83977AF/AG is  made to  meet the
specification of PC97‘s requirement  in the power management: ACPI and
DPM (Device Power Management).

***Versions:...
***Features:...
**W83977TF        WINBOND I/O (Multi I/O)                          c97...
**W83977EF        WINBOND I/O (Multi I/O)                          <98...
**W83977ATF       WINBOND I/O (Multi I/O)                          <98...
**
**Disk Controller:
**W83759/A/F/AF   Advanced VL-IDE Disk Controller                  <96...
**W83769          Local Bus IDE Solution                           <94...
**
**UARTS:
**W86C250A  UART (equivalent of INS8C250A) [no datasheet]
**W86C450/P Universal Asynchronous Receiver/Transmitter         <Jul89...
**W86C451   I/O controller for IBM PC/AT/XT                     <Jul89...
**W86C452   I/O controller for IBM PC/AT                         Jul89...
**W86C456   I/O controller [no datasheet]                            ?
**W860551/P UART with FIFO and Printer Port Controller             <94...
**
**Other:...
*ZyMOS...
*General Sources:...

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