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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...
**HT18          80386SX Single Chip                            c:Sep91
***Info:...
***Configurations:...
***Features:...
**HT21          386SX/286 Single Chip (20 MHz)                 c:Aug91...
**HT22          386SX/286 Single Chip (25 MHz)                 c:Sep91...
**HT25          3-volt Core Logic for 386SX                    c:Dec92...
**HT35          Single-Chip Peripheral Controller [partial info]     ?...
**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
**Support Chips:
**HT44          Secondary Cache                                c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
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*SIS...
**85C501/502/503 Pentium/P54C PCI/ISA Chipset                <01/09/95
***Notes:...
***Info:...
***Configurations:...
***Features:
****General:...
****85C501 PCI/ISA Cache Memory Controller (PCMC)
o   Supports the Pentium Processor at 60 MHz or 66 MHz Bus Speed
o   Supports the P54C Processor at 50 MHz, 60 MHz or 66 MHz Bus Speed
o   Supports the Pipelined Address Mode of the Pentium or the P54C 
    Processor
o   Integrated Second Level (L2) Cache Controller
    - Write Through and Write Back Cache Modes
    - 8 bits or 7 bits Tag with Direct Mapped Organization
    - Supports Standard and Burst SRAMs
    - Supports 64 KBytes to 2 MBytes Cache Sizes
    - Cache Read/Write Cycle of 3-2-2-2 or 4-2-2-2 Using Standard 
      SRAMs at 66 MHz
    - Cache Read/Write Cycle of 3-1-1-1 Using Burst SRAMs at 66 MHz
o   Integrated DRAM Controller
    - Supports 2 MBytes to 128 MBytes of Cacheable Main Memory
    - Concurrent Write Back
    - CAS#-before-RAS# Transparent DRAM Refresh
    - 256K/1M/4M/16M xN 70ns Fast Page Mode DRAM Support
    - Programmable DRAM Speed
    - Programmable CAS# driving Current
o   Two Programmable Non-Cacheable Regions
o   Option to Disable Local Memory in Non-Cacheable Regions
o   Shadow RAM in Increments of 16 KBytes
o   Supports Pentium/P54C SMM Mode
o   Supports CPU Stop Clock
o   Provides High Performance PCI Arbiter
    - Supports Four PCI Masters
    - Supports Rotating Priority Mechanism
    - Hidden Arbitration Scheme Minimizes Arbitration Overhead
o   Integrated PCI Bridge
    - Translates the CPU Cycles into the PCI Bus Cycles
    - Provides CPU-to-PCI Read Assembly and Write Disassembly 
      Mechanism
    - Translates Sequential CPU-to-PCI Memory Write Cycles into PCI 
      Burst Cycles
    - PCI Burst Write in the Pace of  X-2-2-2-....
    - PCI Burst Read L2 Cache in X-2-2-2-....
    - PCI Burst Read DRAM in X-3-2-3-2-....
    - Cache Snoop Filters Ensure Data Coherency and Minimize Snoop 
      Frequency
o   208-Pin PQFP Package
o   0.6μm CMOS Technology

****85C502 PCI Local Data Buffer (PLDB)...
****85C503 PCI System I/O (PSIO)...
**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:...
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