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**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97
***Notes:...
***Info:
The 82371AB  PCI ISA  IDE Xceierator (PIIX4)  is a  multi-function PCI
device implementing a PCI-to-ISA bridge  function, a PCI IDE function,
a  Universal  serial Bus  host/hub  function,  and an  Enhanced  Power
Management  function. As  a PCI-to-ISA  bridge, PIIX4  integrates many
common,  I/O functions  found in  ISA-based PC  systems-two 82C37  DMA
Controllers, two 82C59 interrupt  Controllers, an 82C54 Timer/Counter,
and a Real Time Clock.  In  addition to compatible transfers, each DMA
channel supports Type  F transfers.  PIIX4 also  contains full support
tor both  PC/PCI and Distributed DMA  protocols implementing PCI-based
DMA. The interrupt Controller has Edge or Level sensitive programmable
inputs  and  fully  supports  the  use of  an  external  I/O  Advanced
Programmable interrupt  Controller (APIC) and Serial  interrupts. Chip
select  decoding  is provided  for  BIOS,  Real Time  Clock,  Keyboard
Controller,   second  external   microcontroller,  as   well  as   two
Programmable  Chip  Selects.   PIIX4   provides  full  Plug  and  Play
compatibility. PIIX4 can be configured  as a Subtractive Decode bridge
or as a Positive Decode bridge.   This allows the use of a subtractive
decode  PCI-to-PCI  bridge  such  as  the  Intel  380FB  PCIset  which
implements, a PCI/ISA docking station environment.

PIIX4 supports two IDE connectors for up to four IDE devices providing
an interface  for IDE hard disks and  CD ROMS. Up to  four IDE devices
can  be supported  in Bus  Master  mode.  PIIX4  contains support  for
"Ultra DMA/33" synchronous DMA compatible devices.

PIIX4 contains a  Universal Serial Bus, (USB) Host  Controller that is
Universal  Host  Controller  interface  (UHCI)  compatible.  The  Host
Controller's root hub has two programmable USB ports.

PIIX4  supports  Enhanced   Power  Management,  including  full  Clock
Control,  Device Management  for up  to  14 devices,  and Suspend  and
Resume logic with Power On Suspend, Suspend to RAM or Suspend to Disk,
It fully  supports Operating System Directed Power  Management via the
Advanced  Configuration  and  Power  Interface  (ACPI)  specification.
PIIX4 integrates both  a System Management Bus (SMBus)  Host and Slave
interface for serial communication with other devices.

***Versions:...
***Features:...
**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...
**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
***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:
Chips:
[82454NX] (PXB) [82453NX] (MUX) 
[82452NX] (RCG) [82451NX] (MIOC) 
[82371EB] (PIIX4E),                            
CPUs:          Single/Dual/Quad P-II Xeon/P-III Xeon
DRAM Types:    FPM EDO 2-way Interleave 4-way Interleave
Mem Rows:      8
DRAM Density:  16Mbit 64Mbit
Max Mem:       8GB
ECC/Parity:    Both
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3


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