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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...
**
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**W86C451   I/O controller for IBM PC/AT/XT                     <Jul89
***Info:
GENERAL DESCRIPTION

The W860451 is an enhanced version of the popular W860450 asynchronous
communication element  (ACE) fabricated using  WINBOND'S CMOS process.
The  device   supports  one  serial-to-parallel   conversion  on  data
characters  received  from  a  peripheral  device  or  a  MODEM.   and
parallel-to-serial  conversion on  data characters  received  from the
CPU. The  CPU can  read the complete  status of  the UART at  any time
during the functional  operation. Status information reported includes
the type and  condition of the transfer operations  being performed by
the UART as well as any error conditions (parity, overrun, framing. or
break  interrupt).   The  UART   includes  a  programmable  baud  rate
generator that is capable of dividing the timing reference clock input
by divisors of 1 to (2^16 -  1), and producing a 16x clock for driving
the internal  transmitter logic. Provisions  are also included  to use
this  16x clock  to drive  the receiver  logic.  The  UART  includes a
complete  MODEM-control capability  and a  processor-interrupt system.
interrupts can  be programmed  to the user’s  requirements, minimizing
the computing required to handle the communications link.  In addition
to its communication interface  capabilities, the W860451 provides the
user with a parallel Centronics type printer.
***Versions:...
***Features:...
**W86C452   I/O controller for IBM PC/AT                         Jul89...
**W86C456   I/O controller [no datasheet]                            ?
**W860551/P UART with FIFO and Printer Port Controller             <94...
**
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