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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...
**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:
***440FX (Natoma)       05/06/96...
***440LX (Balboa)       08/27/97...
***440BX (Seattle)      c:Apr'98...
***440DX (?)            c:?...
***440EX (?)            c:Apr'98...
***440GX (Marlinespike) 06/29/98...
***440ZX & 440ZX-66 (?) 01/04/99...
***440ZX-M (?)          05/17/99...
***440MX (Banister)     05/17/99...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
**800 series...
*Headland/G2...
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*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
**SL82C550   'Rossini' Pentium          [no datasheet]            c:95
***Notes:
from:
http://www.os2forum.or.at/english/info/os2hardwareinfo/pci_chips.html

The Symphony  "Rossini" Chipset  (Symphony Labs:  10AD/4269) (9/13/95)
This is apparently a low-cost alternative to the Triton chipset, as it
operates  with up  to 66  MHz external  clock rates,  up to  two CPUs,
pipelined or non-pipelined, synchronous or [conventional] asynchronous
SRAM cache,  EDO RAM, and  does dual-port busmastering IDE.   It will,
apparently, adjust the voltages to  its various (CPU, PCI, cache, RAM)
buses  to suit  their requirements,  and will  control up  to six  PCI
masters.   It consists  of the  SL82C551 cache/memory  controller, the
SL82C522 data path controller, and the SL82C555 system I/O controller.

***Configurations:...
**
**Support Chips:
**SL82C365    Cache Controller (for 386DX/SX)                     c:91...
**SL82C465    Cache Controller (for 486/386DX/SX)                 c:91...
*TI (Texas Instruments)...
*UMC...
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