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**450NX  (?)            06/29/98:
Chips:
[82454NX] (PXB) [82453NX] (MUX) 
[82452NX] (RCG) [82451NX] (MIOC) 
[82371EB] (PIIX4E),                            
CPUs:          Single/Dual/Quad P-II Xeon/P-III Xeon
DRAM Types:    FPM EDO 2-way Interleave 4-way Interleave
Mem Rows:      8
DRAM Density:  16Mbit 64Mbit
Max Mem:       8GB
ECC/Parity:    Both
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3


**?????  (Profusion)    c:99...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C496/7       DXBB PC/AT Chipset (Cached)                 <01/16/92
***Info:
The OPTi  82C497 is a Direct  Mapped Write Back  cache controller with
one level write buffer that is  an optional part of the DXBB (Building
Block) Chip  set.  The DXBB also  contains the 82C496  and the 82C206,
which form the  heart of the system.  The 82C497 is  added to the DXBB
chip set for cache based systems.

The OPTi  82C496 offers an  upgradable CPU module  base-board solution
for the 80386  or the 80486 PC/AT system. By  swapping the CPU module,
the  vendor can configure  the 82C496  driven base-board  into various
32-bit AT  systems - 386 or 486  CPU, with cache or  without cache and
rated at 16MHz- 50MHz.

For the Non-Cache systems, the CPU interfaces directly with the 82C496
and the local devices, like the local VGA controller or the local hard
disk adaptor.

For cache based systems the 82C497 (the cache controller) sits between
the CPU and  the 82C496 and the local devices.  All the high frequency
signals are isolated by the  82C497. This allows the base-board to run
at a fixed speed  (25 or 33MHz) - while the CPU  and the Cache can run
synchronously at any determined  rated speed. This provides a reliable
upgrade method for the CPU modules.

***Configurations:...
***Features:...
**82C498         DXWB PC/AT chipset [no datasheet]                   ?...
**82C499         DXSC DX System Controller                        c:93...
**82C546/547     Python PTM3V                                     c:94...
**82C556/7/8     Viper [no datasheet]                                ?...
**82C556/7/8N    Viper-N  Viper Notebook Chipset             <05/25/95
***Notes:...
***Info:...
***Configurations:...
***Features:
CPU Interface
o   Fully supports Intel’s 3.3V Pentium Processor and dual processor 
    configuration at 50, 60, and 66.667MHz
o   Supports P54C, P55C, K5, and M1 processors
o   Supports the Cyrix M1 Processor linear burst mode
o   Three chip solution:
    - 82C556 DBC (Data Buffer Controller) in a 160-pin PQFP (Plastic 
      Quad Flat Pack) or 176-pin TQFP (Thin Quad Flat Pack)
    - 82C557 SYSC (System Controller) in a 208-pin PQFP or TQFP
    - 82C558N IPC (Integrated Peripherals Controller) in a 208-pin 
      PQFP or TQFP
o   Supports CPU address pipelining

Cache Interface
o   Write-back/write-through, direct-mapped cache with size 
    selections: 64KB, 128KB, 256KB, 1MB and 2MB
o   Support for synchronous and asynchronous SRAMs, pipelined sync- 
    hronous SRAMs, and Intel standard BSRAMs (BiCMOS SRAMs)
o   Support for the Sony SONIC-ZWPT Cache Module
o   Programmable cache write policy:
    - Write-back
    - Write-through
    - Adaptive write-back
o   Built-in tag auto-invalidation circuitry
o   Fully programmable 3-2-2-2 asynchronous cache burst read/Write 
    cycles, 3-1-1-1/2-1-1-1 burst read/write support at 66/50MHz
o   Options for cacheable, write protected. system and video BIOS

DRAM Interface
o   Supports six banks of 64-bit wide DRAMs with 256KB, 512KB. 1MB, 
    2MB, 4MB, 8MB and 16MB addressing page mode DRAMs
o   Supports DRAM configurations up to 512MB
o   Supports 3-3-3-3 pipelined DRAM burst cycles
o   64-bit DRAM post write buffer
o   Programmable drive currents for the DRAM control signals
o   Hidden refresh with CAS-before-RAS refresh supported
o   Support for two programmable non-cacheable memory regions

PCI Interface
o   Interfaces the CPU and standard buses to both Peripheral Component 
    Interconnect (PCI) and VL bus operating in synchronous/async- 
    hronous modes, with VL bus always running at PCI bus operating 
    frequency
o   Supports three PCI masters, one VL slave, and six ISA peripherals
o   Supports PCI pre-snoop for PCI masters
o   PCI byte/word merge support for CPU accesses to PCI bus,‘ and 
    support for PCI pre-fetch
o   Burst mode PCI accesses to local memory supported

Miscellaneous
o   Integrated two drive VL-based IDE controller
o   Self-refresh supported during Suspend mode
o   Support for flash ROM
o   Shadow RAM option
o   Transparent 8042 emulation for fast CPU reset and Gate A20 
    generation
o   Supports Port 092h, fast Gate A20 and fast reset
o   Includes a fully integrated 82C206 with external real-time clock 
    (RTC) interface

**82C556M/7M/8E  Viper-N+ Viper Notebook Chipset                  c:96...
**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...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...

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