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**82385       32-bit Cache Controller for 80386               09/29/87
***Notes:...
***Info:...
***Versions:...
***Features:
o   Improves 80386 System Performance
    - Reduces Average CPU Wait States to Nearly Zero
    - Zero Wait State Read Hit
    - Zero Wait State Posted Memory Writes
    - Allows Other Masters to Access the System Bus More Readily
o   Hit Rates up to 99%
o   Optimized as 80386 Companion
    - Simple 80386 Interface
    - Part of 386-Based Compute Engine Including 80387 Numerics 
      Coprocessor and 82380 Integrated System Peripheral
    - 16 MHz, 20 MHz, and 25 MHz Operation
o   Software Transparent
o   Synchronous Dual Bus Architecture
    - Bus Watching Maintains Cache Coherency
o   Maps Full 80386 Address Space (4 Gigabytes)
o   Flexible Cache Mapping Policies
    - Direct Mapped or 2-Way Set Associative Cache Organization
    - Supports Non-Cacheable Memory Space
    - Unified Cache for Code and Data
o   Integrates Cache Directory and Cache Management Logic
o   High Speed CHMOS III Technology
o   132-Pin PGA Package

**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
***Notes:
Date source: 1995_Intel_Pentium_Processors_and_Related_Components.pdf

Information taken from: 
            1995_Intel_Pentium_Processors_and_Related_Components.pdf*
                                         8249x Cache controllers.pdf**
>*  Datasheet dated Nov'94
>** Datasheet undated, whole document dated '95

The info and features section have  been solely sourced from the first
source.   The  second source  provides  far  more detail.   Additional
information in the configurations section  and below have been sourced
from the second.

"Although the 82497 Cache Controller  is part of the Pentium processor
(735\90, 815\100, 1000\120, 1110\133) CPU-Cache Chip Set and the 82496
Cache  Controller is part  of the  Pentium Processor  (510\60, 567\66)
Chip  Set, the  two parts  are functionally  identical except  for the
differences noted in this section." - p491

Aside  from some  minor  differences in  pin  configuration, the  main
difference is the direct support  for 3.3V processors. This chipset is
still a 5V part. The cache operates at bus speed, max 66MHz.


This  chip was  used on  the Pentium  90MHz CPU  complexes of  Intel's
Xpress  platform.   Specifically  the BXCPUPENT90  (Single  90MHz,  16
82492s). Also found on IBM 9595/Server 500 Pentium 90MHz complexes.

***Info:...
***Configurations:...
***Features:...
**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**
**Later chipsets (basic spec):
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**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
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**5595       Pentium PCI System I/O                          <12/24/97
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**950        LPC I/O                                         <07/16/99...
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