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**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:...
***Features:...
**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...
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**82C556M/7M/8E  Viper-N+ Viper Notebook Chipset                  c:96
***Notes:...
***Info:...
***Configurations:...
***Features:
System 
o   100% PC/AT compatible
o   Supports 3.3V Intel Pentium 75/90/100/120 processors at bus 
    frequencies up to 66MHz
o   Supports Cyrix 6x86 processor

DRAM 
o   Full 64-bit FPM/EDO DRAM controller
    - Supports 2-2-2 EDO pipeline at 66MHz bus speed
    - Supports 5V or 3.3V DRAM with-out buffers
    - Supports up to 512MB
    - Controls up to 6 banks
    - Post write buffer
o   Selectable current drive for DRAM bus 

Cache 
o   L1 Cache supports write-through and write-back modes
o   Power managed L2 Cache
    - 64KB-2MB cache
    - Write-back or write-through modes
    - 2-1-1-1 synchronous cache cycles
    - 3-1-1-1 pipelined synchronous cache cycles
    - Combined tag/dirty SRAM option

ISA/VL/PCI Bus 
o   Integrated PCI bus with operation up to 33MHz; supports up to 
    three masters
o   CLKRUN# support for PCI
o   Distributed DMA support (software-based)
o   100% AT-compatible ISA bus; 3.3V or 5V operation, also supports 
    ISA bus masters
o   VL bus support (slave only)
o   Integrated Local Bus IDE supports four drives, which can be bus 
    masters, modes 4 and 5 supported  

Power Management
o   Advanced Power Management Unit
o   Full CPU System Management Mode (SMM) support
o   Full CPU power control through "clock throttling"
o   Full system clock control, even CPU clock can be stopped during 
    APM doze mode
o   Both hardware and software controlled power management
o   Full peripheral power control
o   13 flexible peripheral timers
o   Sixteen power control pins
o   I/O trapping captures address and data
o   Distributed DMA support (software-based)
o   Full peripheral activity tracking
o   Automatic peripheral power-up/power-down features
o   Full suspend current leakage control
o   36 Power Management Interrupt (PMI) sources
o   Eight external power management interrupt sources
o   Supports SMBASE re-programmability that allows the cache to be
    maintained during system management mode, avoiding cache fills 
    after returning from SMM
o   Proprietary automatic internal pull-up/pull-down resistors 
    activated only when needed to reduce power consumption

Thermal Management
o   Advanced Thermal Management Unit
o   Internal mechanism tracks CPU activity and initiates cool down
    mode before CPU temperature reaches a damaging level
o   External sensor option

Packaging
o   82C556M Data Buffer
    - 176 pin TQFP (0.5mm pin spacing)
o   82C557M System Controller
    - 208 pin TQFP (0.5mm pin spacing)
o   82C558E Peripheral Controller
    - 208 pin TQFP (0.5mm pin spacing)

82C602A RTC/Buffer Companion Chip
o   Integrated Real-Time Clock
o   Based on Benchmark Bq3285
o   256 bytes battery-backed memory
o   Integrates multiplexing/demultiplexing logic, latches, and 
    buffers
o   Eliminates most/all TTL in typical synchronous cache system
o   100 pin TQFP package (0.5mm pin spacing)
o   Also available in 100 pin PQFP
     
**82C566/7/8     Viper-Max Chipset Scalable MultiMedia PC Solution   ?...
**82C571/572     486/Pentium                                      c:93...
**82C576/7/8     Viper Xpress  [no datasheet]                        ?...
**82C576/8/9     Viper XPress+ [no datasheet, some info]     <01/16/97...
**82C596/597     PTMAWB Pentium Adaptive Write-back (Cobra)       c:93...
**82C650/1/2     Discovery (Pentium Pro) [no datasheet]              ?...
**82C681/2/6/7   386/486WB EISA                                   c:92...
**82C683         386/486AWB EISA [no datasheet]                      ?...
**82C693/6/7     Pentium uP Write Back Cache EISA                 c:93...
**82C700         FireStar                                         c:97...
**82C701         FireStar Plus                                    c:97...
**82C750         Vendetta      [no datasheet]                        ?...
**82c801         SCWB2 DX Single Chip Solution                    c:92...
**82C802         SCWB2 PC/AT Single Chip [no datasheet]              ?...
**82C802G/GP     System/Power Management Controller (cached)      c:93...
**82C895         System/Power Management Controller (cached)   c:Sep94...
**82C898         System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2       Buffer Devices                                 <Nov94...
**82C822         PCIB (VLB-to-PCI bridge)                         c:94...
**Other:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**VT82C586/A/B PCI Integrated Peripheral Controller          <10/13/96
***Info:
The VT82C586A  PIPC (PCI Integrated  Peripheral Controller) is  a high
integration,  high  performance  and  high compatibility  device  that
supports Intel and non-Intel based processor to PCI bus bridge to make
a complete  Microsoft PC97 compliant  PCI/ISA system.  In  addition to
complete  ISA  extension  bus  functionality, the  VT82C586A  includes
standard intelligent peripheral controllers:

a) Master  mode enhanced IDE  controller with dual channel  DMA engine
and  interlaced dual  channel commands.   Dedicated FIFO  coupled with
scatter  and  gather master  mode  operation  allows high  performance
transfers between  PCI and IDE  devices.  In addition to  standard PIO
and  DMA mode  operation,  the VT82C586A  also  supports the  emerging
UltraDMA-33  standard to  allow  reliable data  transfer  rates up  to
33MB/sec  throughput.   The  IDE  controller  is  SFF-8038i  v1.0  and
Microsoft Windows-95 compliant.

b) Universal Serial Bus controller  that is USB v1.0 and Universal HCI
v1.1 compliant.  The VT82C586A includes the root hub with two function
ports with integrated physical layer transceivers.  The USB controller
allows hot  plug and play  and isochronous peripherals to  be inserted
into the  system with universal  driver support.  The  controller also
implements legacy  keyboard and mouse support so  that legacy software
can run transparently in a non-USB-aware operating system environment.

c)  Keyboard controller with PS2 mouse support.

d) Real  Time Clock with 128  byte extended CMOS.  In  addition to the
standard ISA  RTC functionality, the integrated RTC  also includes the
date alarm and other  enhancements for compatibility with the emerging
ACPI standard.

e)  Notebook-class  power  management  functionality  including  event
monitoring, CPU clock throttling (Intel processor protocol), power and
leakage control, hardware-  and software-based event handling, general
purpose  IO,  chip select  and  external  SMI.   The power  management
function supports legacy APM v1.2.

f) Plug and  Play controller that allows complete  steerability of all
PCI interrupts to any interrupt channel.  Two additional interrupt and
DMA channels are provided to allow plug and play and reconfigurability
of on-board peripherals for Windows 95 compliance.

The  VT82C586A also  enhances the  functionality of  the  standard ISA
peripherals.  The  integrated interrupt controller  supports both edge
and level triggered interrupts channel by channel.  The integrated DMA
controller supports type F DMA  in addition to standard ISA DMA modes.
Compliant  with  the  PCI-2.1  specification, the  VT82C586A  supports
delayed transactions so  that slower ISA peripherals do  not block the
traffic  of the  PCI  bus.  Special  circuitry  is built  in to  allow
concurrent operation  without causing dead  lock even in  a PCI-to-PCI
bridge environment The chip also includes four levels (doublewords) of
line  buffers from  the PCI  bus  to the  ISA bus  to further  enhance
overall system performance.

***Versions:...
***Features:...
**VT82C596/A   Mobile PCI Integrated Peripheral Controller   <11/05/97...
**VT82C686A/B  PCI Super-I/O Integrated Peripheral Ctrl.     <02/10/98...
**Later P-Pro/II/III/Celeron...
**Later AMD...
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