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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:
82371FB (PIIX)
82371SB (PIIX3) d:02/12/96

The main difference is that the PIIX3 supports USB.

***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...
**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:
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


**?????  (Profusion)    c:99...
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**SL9250  Page Mode Memory Controller (16/20MHz 8MB Max)        <oct88
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**SL9350  Page Mode Memory Controller (16/20/25MHz 16MB Max)    <oct88...
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