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**82489DX       Advanced Programmable Interrupt Controller    10/12/92
***Notes:...
***Info:
1.0 INTRODUCTION

The  82489DX  Advanced   Programmable  Interrupt  Controller  provides
multiprocessor interrupt management, providing both static and dynamic
symmetrical interrupt distribution across all processors.

The main  function of the  82489DX is to provide  interrupt management
across all  processors. This  dynamic interrupt  distribution includes
routing of the interrupt to the lowest-priority processor. The 82489DX
works in  systems with multiple  I/O subsystems, where  each subsystem
can  have  its  own  set  of  interrupts.   This  chip  also  provides
inter-processor interrupts,  allowing any  processor to  interrupt any
processor or set  of processor. Each 82489DX I/O  init interrupt input
pin is individually  programmable by software as either  edge or level
triggered.  The interrupt vector and interrupt steering information an
be specified  per pin.  A  32-bit wide timer  is provided that  can be
programmed to interrupt the local processor.  the timer can be used as
a counter to provide a time base to software running on the processor,
or to generate  time slice interrupts locally to  that processor.  the
82489DX   provides   32-bit   software    access   to   its   internal
registers. Since no  82489DX register read have any  side effects, the
82489DX registers  can be aliased  to a  user read-only page  for fast
user access (e.g., performance monitoring timers).

The 82489DX  supports a generalized naming/addressing  scheme that can
be tailored by  software to fit a variety of  system architectures and
usage  models.   It  also  supports 8259A  compatibility  by  becoming
virtually  transparent with  regard to  an externally  connected 8259A
style controller, making the 8259A visible to software.

***Versions:...
***Features:...
**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...
**800 series...
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*SIS...
**5595       Pentium PCI System I/O                          <12/24/97
***Notes:...
***Info:...
***Versions:...
***Features:...
**950        LPC I/O                                         <07/16/99...
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*VIA...
*VLSI...
**VL82C3216        Bus Expanding Controller Cache with write buffer  ?
***Info:
The VL82C3216 Bus Expanding  Controller (BANC) Cache with Write Buffer
is  specifically  designed  to  provide a  high-performance,  low-cost
solution for  interfacing 386SX  PC/AT-compatible chip sets  to 386DX,
Am386DXL,  AM386DXLV,  486DX,  486SX,  or compatible  processors.  The
designs  may   be  entirely  new  systems  or   upgrades  to  existing
ones. Power management features also make this device ideal for laptop
computers  or  other battery  operated  systems.   The performance  is
achieved  through the  use of  a write  buffer structure,  an external
second level cache, prediction algorithms, and maximizing the internal
first level cache of the i486, if used.

The  high  level of  integration  is  entered  on the  VL82C3216.   It
controls all  functions between the  host processor bus and  the 386SX
local  bus.   in  addition  the  the  write  buffer  and  second-  and
first-level  cache controls,  the  VL82C3216  contains prediction  and
burst mode algorithms that take full advantage of the page mode design
of existing 386SX  system architecture.  Through the  use of pipelined
page mode accesses to system memory,  the VL82C3216 bursts data to and
from memory at rates  of up to 25 MB per  second. This provides 32-bit
memory performance at 16-bit memory costs.
 
***Versions:...
***Features:...
**VL82C521/522     Lynx/M                                            ?...
**VL82C530         Eagle Ð                                         c95...
**VL82C541/543     Lynx                                            c95...
**VL82C591/593     SuperCore 590                                   c94...
**VL82C594/596/597 Wildcat                                         c95...
**I/O Chips:
**VL82C106 Combination I/O chip                                      ?...
**VL82C107 SCAMP  Combination I/O chip                               ?...
**VL82C108 TOPCAT Combination I/O chip                               ?...
**VL82C110 Combination I/O chip                                      ?...
**VL82C113 SCAMP  Combination I/O chip                               ?...
**VL82C114 Combination I/O chip                                      ?...
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