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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...
*HMC (Hulon Microelectronics)...
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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:...
***Configurations:...
***Features:
o   Host Bus
    - Supports Intel 486, P24D, P24T, DX4, SL
    - Enhanced 486, AMD 486, Enhanced Am486, and Cyrix M7/Cx 5x86
      in 25/33/40/50 Mhz, 5V CPU.
o   VESA Bus Slave
    - Supports VESA Bus Specification Rev. 2.0p with Local Device 
      Target only.
o   PCI Local Bus
    - Supports PCI Bus Specification Rev. 2.0 with up to 4 PCI Masters
    - Implements 3 Level Post Write Buffer for CPU write PCI Target 
      Memory Cycle.
    - Supports Back to Back Single Memory Write to PCI Burst Write.
    - Supports PCI Interrupt Steering with Four PIRQ Inputs.
    - Supports PCI Master Burst Accesses On-Board Memory Up to 64 
      Double Word Long.
    - Supports Concurrency PCI Bus.
    - Snoop  Filter  and  Advanced  Snooping  for  Reducing CPU Snoops 
      During Sequential PCI Master Accesses On-Board Memory Cycles.
    - Supports PCI Bus PCI to PCI Bridge.
o   Supports L1 Cache Write Back CPU (P24T/P24D/M7/Enhanced Am486) 
    systems
o   Supports Cx 5x86 Linear Burst Order Mode.
o   L2 Cache Controller
    - Write-Back or Write-Through Schemes
    - Bank Interleave/Non-Interleave Cache Access
    - Cache Size: 64K/128K/256K/512K/1MB
    - 8 bit or 7 bit Tag (Combined Tag and Dirty SRAM) with  
      Direct-Mapped cache organization.
    - Optional Separate Dirty SRAM.
o   DRAM Controller
    - Supports 8 Banks Non-Interleaved Access for Single and Double 
      Sided SIMMs up to 255 MBytes.
    - Supports DRAM CAS Before RAS Refresh.
    - Supports "Table-Free" DRAM configuration.
    - Programmable driving current for the DRAM signals.
    - Supports Symmetrical and Asymmetrical DRAMs.
    - Supports 256K/512K/1M/2M/4M/8M/16M/32M xN Fast Page Mode and 
      EDO DRAM.
o   Built-In Local Bus IDE Interface
    - Supports Data Conversion for the Double Word Accessing
    - Supports Symmetry Configuration for Channel 1 and Channel  
      0,  PIO  Mode  IDE  Hard Disks.
    - Supports Mode 3 and above Timing.
    - Supports Individual Drive Timing Setting for Optimal Performance
    - Supports Posted Write Buffers and Pre-fetch Buffer.
    - Supports Primary IDE or Secondary IDE Addressing (1Fx/17x)
o   Fast-Slow Link Interface
    - Linkage to ISA Bridge by FS-Link Interface.
    - Fast Access to BIOS, ISA Memory Holes, and Interrupt Acknowledge 
      Cycle by FS-Link.
    - Two Programmable Non-Cacheable Regions 
    - Two Programmable PCI Memory Holes and One Programmable ISA 
      Memory Holes.
o   208-Pin PQFP
o   0.6um Low Power CMOS Technology

**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...
**VT82C580VP   Apollo VP,  Pentium/M1/K5 PCI/ISA System      <02/15/96
***Info:
The  VT82C580VP Apollo-VP  is a  high performance,  cost-effective and
energy efficient  chip set for  the implementation of  PCI/ISA desktop
and   notebook  personal   computer  systems   based  on   the  64-bit
P54C/Pentium/K5/M1 super-scalar processors. CPU and cache interface is
supported up to 66Mhz CPU  external bus speed (with CPU internal speed
up  to  200Mhz  and  above).  The  CPU,  DRAM  and  PCI  bus  are  all
independently powered  so that each of the  bus can be run  at 3.3v or
5v, independently. The ISA bus always runs at 5v.

The VT82C580VP chip set  consists of the VT82C585VP system controller,
the VT82C586  PCI to ISA bridge,  and two instances  of the VT82C587VP
data  buffers. The  CPU bus  is minimally  loaded with  only  the CPU,
secondary cache and the chip  set. The VT82C587VP data buffers isolate
the CPU bus from the DRAM and  PCI bus so that CPU and cache operation
may  run  reliably  at   the  high  frequencies  demanded  by  today's
processors. The  VT82C585VP contains arbitration logic  to support the
UMA (unified  memory architecture) with video/GUI  products from major
video  vendors.  Multiple  deep  FIFOs (thirty-two  double words)  are
included  between multiple  data paths  to allow  efficient concurrent
operation  and  DRAM utilization.   The  VT82C586  PCI  to ISA  bridge
includes  integrated  206-style  IPC  (DMA, interrupt  controller  and
timer),  integrated  keyboard   controller  with  PS2  mouse  support,
integrated DS12885 style  real time clock with extended  128 byte CMOS
RAM, integrated master mode  enhanced IDE controller with full scatter
and  gather  capability, and  integrated  USB  (universal serial  bus)
interface with root hub and  two function ports with built-in physical
layer transceiver. A complete main  board can be implemented with only
six  TTLs. Please refer  to Figure  1 [see  datasheet] for  the system
block diagram.

***Configurations:...
***Features:...
**VT82C580VPX  Apollo VPX, VPX/97, Pentium with 66/75MHz Bus <01/09/97...
**VT82C590     Apollo VP2, VP2/97, Single-Chip Pentium 66MHz <01/10/97...
**VT82C597/AT  Apollo VP3, Single-Chip for Pentium with AGP  <10/03/97...
**VT82C598MVP  Apollo MVP3,Single-Chip 66/75/83/100MHz & AGP <09/22/97...
**VT8501       Apollo MVP4,Single-Chip 66-100MHz & AGP       <11/04/98...
**VT82C680     Apollo P6, Pentium-Pro Chip Set               <08/30/96...
**Support chips:
**VT82C505     Pentium/486 VL to PCI Bridge                  <05/30/94...
**VT82C586/A/B PCI Integrated Peripheral Controller          <10/13/96...
**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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