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**82371FB/SB  PCI ISA IDE Xcelerator 82371FB/82371SB (PIIX/3) 01/31/95
***Notes:...
***Info:
The 82371FB  (PIIX) and  82371SB (PIIXS) PCI  ISA IDE  Xcelerators are
multi-function PCI  devices implementing a  PCI-to-ISA bridge function
and an PCI IDE function. In addition, the PIIXS implements a Universal
Serial Bus  host/hub function. As a PCI-to-ISA  bridge, the PIIX/PIIX3
integrates many  common I/O functions found in  ISA-based PC systems-a
seven-channel DMA controller, two 82059 interrupt controllers, an 8254
timer/counter, and power management support. In addition to compatible
transfers, each  DMA channel supports  type F transfers.   Chip select
decoding  is  provided  for   BIOS,  real  time  clock,  and  keyboard
controller. Edge/Level interrupts and interrupt steering are supported
for PCI plug  and play compatibility. The PIIX/PIIX3  supports two IDE
connectors for up  to four IDE devices providing  an interface for IDE
hard disks and  CD ROMS. The PIIX/PIIX3 provides  motherboard plug and
play  compatibility.   PIIX  implements  two  steerable  DMA  channels
(including  type  F  transfers)  and  up to  two  steerable  interrupt
lines. PIIX3  implements one steerable interrupt  line.  The interrupt
lines  can be  routed to  any of  the available  ISA  interrupts. Both
PIIX/PIIX3 implement a programmable chip select.

PIIXS contains  a Universal Serial  Bus (USB) Host Controller  that is
UHCI compatible.  The Host Controller’s root hub  has two programmable
USB ports. PIIXS also provides support for an external IOAPIC.

----------------------------------------------------------------------
 This  document  describes   the  PIIXS  Component.   Unshaded  areas
 describe the  82371FB PIIX.  Shaded  areas, like this  one, describe
 the PIIXS operations that differ from the 82371FB PIIX.
----------------------------------------------------------------------
***Versions:...
***Features:...
**82371MX     Mobile PCI I/O IDE Xcelerator (MPIIX)           11/01/95...
**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97...
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB)   c:Mar93...
**82378       System I/O (SIO) (82378IB and 82378ZB)           c:Mar93...
**82379AB     System I/O-APIC (SIO.A)                           <Dec94...
**82380       32-bit DMA Controller w/ Integrated Peripherals 02/01/87...
**82380FB/AB  PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384       Clock Generator and Reset Interface                  c86...
**82385       32-bit Cache Controller for 80386               09/29/87...
**82385SX     32-bit Cache Controller for 80386SX             01/25/89...
**82395DX     High Performance Smart Cache                    06/18/90...
**82395SX     Smart Cache                                     12/17/90...
**82396SX     Smart Cache                                     12/17/90...
**82485       Turbo Cache (and 485Turbocache)                      c90
***Notes:...
***Info:...
***Versions:...
***Features:...
**82489DX       Advanced Programmable Interrupt Controller    10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91...
**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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**5595       Pentium PCI System I/O                          <12/24/97
***Notes:...
***Info:
SiS5595  is a  highly integrated  system I/O  that constitutes  a high
performance, rich featured, yet glueless solution for both Pentium and
Pentium  II  systems.   

The SiS5595 PCI  system I/O integrates the PCI-to-ISA  bridge with the
DDMA and PC/PCI  DMA, Serial IRQ capability, the  ACPI/Legacy PMU, the
Data  Acquisition   Interface,  the  Universal   Serial  Bus  host/hub
interface,  and the  ISA bus  interface,  which contains  the ISA  bus
controller, the  DMA controllers,  the interrupt controllers,  and the
Timers.  It also integrates the Keyboard controller, and the Real Time
Clock (RTC).  The built-in USB controller, which is fully compliant to
OHCI (Open Host Controller  Interface), provides two USB ports capable
of running full/low speed  USB devices. The Data Acquisition Interface
offers  the  ability of  monitoring  and  reporting the  environmental
condition  of the  PC.  It  could monitor  5  positive analog  voltage
inputs, 2  Fan speed inputs,  and one external temperature  inputs. It
also integrates the automatic power control logic to control the power
ON/OFF for ATX power supply.  In addition, SiS5595 also integrates the
thermal  detection and frequency  ratio control  logic for  Pentium II
CPU.

***Versions:...
***Features:...
**950        LPC I/O                                         <07/16/99...
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