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**82495XP/490XP Cache Controller / Cache RAM (for i860) 06/05/91
***Notes:...
***Info:...
***Features:
o Two-Way, Set Associative, Secondary Cache for i860 XP
Microprocessor
o 50 MHz "No Glue" Interface with CPU
o Configurable
- Cache Size 256 or 512 Kbytes
- Line Width 32, 64 or 128 Bytes
- Memory Bus Width 64 or 128 Bits
o Dual-Ported Structure Permits Simultaneous Operations on CPU and
Memory Buses
o Efficient MRU Way Prediction
- Zero Wait States on MRU Hit
- One Walt State on MRU Miss
o Dynamically Selectable Update Policies
- Write-Through
- Write-Once
- Write-Back
o MESI Cache Consistency Protocol
o Hardware Cache Snooping
o Maintains Consistency with Primary Cache via Inclusion Principle
o Flexible User-Implemented Memory Interface Enables Wide Range of
Product Differentiation
- Clocked or Strobed
- Synchronous or Asynchronous
- Plpelining
- Memory Bus Protocol
o 82495XP Cache Controller Available in 208-Lead Ceramic Pin Grid
Array Package
o 82490XP Cache RAM Available in 84-Lead Plastic Quad Flatpack
Package
**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:
The HT18 is an advanced PC/AT compatible, single-chip 80386SX design
solution. This highly integrated single chip allows simple, low cost
system design options while featuring high performance, low power
consumption, and minimum board space requirements. Advanced memory
management features include support for page mode, with 2 or 4-way
interleaving in both pipelined and non-pipelined modes(18A/B only).
Extended Hardware EMS options include dual sets of 32 registers with
multiple context operation. Revisions A/B support 256K and 1M DRAMs in
1 by 1, 1 by 4, and 1 by 9 device configurations. Rev C supports 4M
devices, as well. A Shadow RAM option for System Video BIOS and dual
or single system ROM BIOS support adds to overall design versatility.
A complete PC/AT compatible system with advanced features may be
implemented with minimal external support logic. The HT18 performs all
CPU and peripheral support functions in a single chip. Integrated
device functions include DMA Controllers, a Memory Mapper, Timers,
Counters, Interrupt Controllers, a Bus Controller and all supporting
circuitry for PC core logic requirements. An asynchronous AT Bus clock
allows for a constant 8MHz Bus clock rate for highest bus device
compatibility as defined in IEEE Spec P996. This device is packaged in
a 208-pin Plastic Quad Flat Pack combining several external buffers
into this space saving solution.
***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)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
**Later Chipsets:
Info sourced from the very useful plasma-online.de:
http://www.plasma-online.de/index.html?content=http%3A//www.plasma-online.de/english/identify/picture/pcchips.html
Chipset name | OEM of | used on mainboard
---------------+---------------------------+-----------------------------------------
HX Pro | ALi M1521/M1523 |
SX Pro | SiS 530/5595 | M598
AGP Pro PC-100 | VIA VT82C598AT/VT82C596B | M577
TX AGP Pro | SiS 5591/5595/6326 |
TX Two | ALi M1531/M1543 |
TX Pro | ALi M1531/M1543 | M560, M575
TX Pro II | SiS 5597/5598 | M571
TX Pro III | VIA VT82C580VPX/VT82C586B | M573
TX Pro IV | SiS 5591/5592 | M570
Top Gun | ALi Aladdin IV+ | M565
VIA GRA | VIA VT8501/VT82C596B | M858LMR
VX Pro | VIA VT82C580VP/VT82C586B |
VX Pro + | VIA VT82C580VPX/VT82C586B |
VX Pro II | UTron / HiNT UT801X |
VX two | VIA VT82C580VP/VT82C586B | Amptron PM-8600A
VX two | VIA VT82C580VPX/VT82C586B | Amptron PM-8600B
BXToo | VIA Apollo Pro | M760V, M761V
BXToo | VIA VT82C693/VT82C686A | M767V
BXPro | SiS 600/5595 | M747
BXCel | ALi M1621/M1543 | M726, M729
BXpert | VIA VT82C691/VT82C596 |
BXTel | VIA Apollo Pro | M730
Xcel 2000 | SiS 620/5595 | M741LMRT
Super TX | SiS 5597/5598 | ASUS SP97-V, SP98-N, Jetway J-TX98R2
Super TX | ALi M1531/M1543 |
Super TX | ALi M1541/M1543 | Biostar M5ALA, M5ALC, Pionex MBD-P5ABx
Super TX3 | SiS 5571 |
Super TX4 AGP | |
GFXcel | SiS 630 |
GFXpro | ALi M1631/M1535D |
T-Bird | SiS730S | M810
---------------+---------------------------+----------------------------------------
*SIS...
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*TI (Texas Instruments)...
*UMC...
*Unresearched:...
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