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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...
**800 series...
*Headland/G2...
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*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
**85C496/497     486-VIP 486 Green PC VESA/ISA/PCI Chipset         <95
***Info:
The SiS 486-VIP (VESA/ISA/PCI) chips are two-chip solution ideally for
Intel's 80486, SL Enhanced 486, P24D/P24T/DX4 CPU, AMD's 486, Enhanced
Am486 and Cyrix's Cx486 (M7)/Cx 5x86 CPU based on green AT system.  By
supporting the most popular  industrial standard system interfaces, it
provides flexible configurations for system design and applications.

The SiS85C496  PCI & CPU  Memory Controller (PCM) integrates  the Host
Bridge (Host  Interface), the cache  and main memory  DRAM Controller,
the PCI Bridge, the built-in IDE Controller, and the FS-Link Bus (Fast
Slow  Link Bus). It  provides the  address paths  and bus  control for
transfers among  the Host  (CPU/L1 cache), main  memory (L2  cache and
DRAM),  the  Peripheral  Component  Interconnect (PCI)  Bus,  and  the
FS-Link Bus.  The L2  cache controller supports both write-through and
write-back cache policies  and cache sizes up to  1 MBytes.  The cache
memory  can be  built  using standard  asynchronous  SRAMs.  The  main
memory DRAM controller  interfaces DRAM to the Host  Bus, PCI Bus, and
FS-Link Bus. Up to eight single sided SIMMs or four double sided SIMMs
provide a maximum  of 255 MBytes of main  memory.  The installation of
DRAM SIMMs is  "Table-Free", which allows the SIMMs  be installed into
any slot  location and any  combinations.  The built-in IDE  hard disk
controller  allows CPU accessing  hard disk  and also  provides higher
system integration with  lower system cost. The 85C496  is intended to
be used with the SiS85C497 which  is a AT Bus Controller with built-in
206 controller.

The  SiS85C497 AT  Bus  Controller and  Megacells  (ATM) provides  the
interface between  PCI/CPU/Memory Bus (fast  machine) and the  ISA Bus
(slow machine).  It  also integrates many of the  common I/O functions
in today's  ISA based  PC systems.  The  85C497 comprises  the FS-Link
interface  (Fast-Slow  Link  interface),  ISA  bus  controller  ,  DMA
controller and  data buffers to isolate  the FS-Link Bus  from the ISA
Bus  and to  enhance performance.   It  also integrates  a 14  channel
edge/level  interrupt  controller, refresh  controller,  a 8-bit  BIOS
timer, three programmable timer/counters, non-maskable-interrupt (NMI)
control  logic, Power  Management  Unit,  and RTC.  Figure  1 .1  [see
datasheet] shows the system block diagram.


***Configurations:...
***Features:...
**85C501/502/503 Pentium/P54C PCI/ISA Chipset                <01/09/95...
**5101/5102/5103 Pentium/P54C PCI/ISA Chipset                <04/02/95...
**5120           Pentium PCI/ISA Chipset (Mobile)            <01/28/97...
**5501/5502/5503 Pentium/P54C PCI/ISA Chipset                <04/02/95...
**5511/5512/5513 Pentium PCI/ISA                             <06/14/95...
**5571           (Trinity) Pentium PCI/ISA Chipset (75MHz)   <12/09/96...
**5581/5582      (Jessie)  Pentium PCI/ISA Chipset (75MHz)   <04/15/97...
**5591/5592/5595 (David)   Pentium PCI A.G.P. Chipset        <01/09/98...
**5596/5513      (Genesis) Pentium PCI Chipset               <03/26/96...
**5597/5598      (Jedi)    Pentium PCI/ISA Chipset           <04/15/97...
**530/5595       (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**540            (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x            SoC (System-on-chip)                        <03/14/02...
**
**Support chips:
**85C206     Integrated Peripheral Controller [no datasheet]         ?...
**5595       Pentium PCI System I/O                          <12/24/97...
**950        LPC I/O                                         <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*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...
**Other...
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