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**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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...
**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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**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...
**W83C553F    System I/O Controller With PCI Arbiter           c:sep95
***Info:...
***Versions:...
***Features:...
**W83628F/29D PCI TO ISA Bridge Set                                c98...
**W83626F/D   LPC TO ISA Bridge Set                                <00...
**
**Multi I/O:
**W83757          SUPER I/O  CHIP                                  <92...
**W83767F         ??           Multi I/O  [no datasheet]
**W83777F/87F     Power I/O   (Multi I/O)                          <95...
**W83877F         WINBOND I/O (Multi I/O)                          <96...
**W83877TF/TG/TD  WINBOND I/O (Multi I/O)                          c97...
**W83977F/G/AF/AG WINBOND I/O (Multi I/O)                          c97...
**W83977TF        WINBOND I/O (Multi I/O)                          c97...
**W83977EF        WINBOND I/O (Multi I/O)                          <98...
**W83977ATF       WINBOND I/O (Multi I/O)                          <98...
**
**Disk Controller:
**W83759/A/F/AF   Advanced VL-IDE Disk Controller                  <96...
**W83769          Local Bus IDE Solution                           <94...
**
**UARTS:
**W86C250A  UART (equivalent of INS8C250A) [no datasheet]
**W86C450/P Universal Asynchronous Receiver/Transmitter         <Jul89...
**W86C451   I/O controller for IBM PC/AT/XT                     <Jul89...
**W86C452   I/O controller for IBM PC/AT                         Jul89...
**W86C456   I/O controller [no datasheet]                            ?
**W860551/P UART with FIFO and Printer Port Controller             <94...
**
**Other:...
*ZyMOS...
*General Sources:...

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