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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...
**
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**82C802G/GP System/Power Management Controller (cached) c:93
***Notes:
Green version of the 82C802. Supports cached 486 systems running from
20 MHz to 50 MHz. Also supports write-back cache and VESA LB. PCI is
also supported via the 82C822 bridge chip.
This is an amalgamation of two different datasheets, the 802G and
802GP. There is very little difference, see the features section.
***Info:...
***Configurations:...
***Features:
[features found only in the 802GP are marked in [] brackets ]
o Processor interface:
- Intel 80486SX, DX, DX2, SLe, DX4, P24T, P24D
- AMD 486SX, DX2, DXL, DXL2, Plus
- Cyrix DX, DX2, M7
- CPU frequencies supported 20, 25, 33, 40 and 50MHz
o Cache interface:
- Direct mapped cache
- Two banks interleaved or single bank non-interleaved
- 64, 128, 256 and 512K cache sizes
- Programmable wait states for L2 cache reads and writes
- 2-1-1-1 read burst and zero wait state write @ 33MHz
- No Valid bit required
[- Supports external single-chip cache modules from thyroid-party ]
[ vendors for high performance at 50MHz ]
- Supports CPUs with L1 write-back support
o DRAM interface:
- Up to 128MB main memory support
- Supports 256KB, 1MB, 4MB, and 16MB single- and double-sided SIMM
modules
- Read page hit timing of 3-2-2-2 at 33MHz
- Supports hidden, slow. and CAS-before-RAS refresh
- Four RAS lines to support four banks of DRAM
[- Eight RAS lines to support four banks of DRAM ]
- Programmable wait states for DRAM reads and writes
[- Programmable memory holes for supporting ISA memory ]
- Enhanced DRAM configuration map
[- Strong drivers on the MA lines (12/24mA) ]
[- Supports asymmetric DRAMs ]
o Power management:
- Support for SMM (System Management Mode) for system power
management implementations
- Programmable power management
[- CPU clock control ]
- Programmable wake-up events through hardware, software, and
external SMI source
- Multiple level GREEN support (NESTED_GREEN)
- STPCLK# protocol support
[- Programmable GREEN event timer ](802G only)
[- Individually programmable peripheral ](802GP only)
o ISA interface:
- 100% IBM PC/AT ISA compatible
[- Programmable edge- or level-trigger interrupts ]
- integrates DMA, timer and interrupt controllers
[- Slew rate control for output drivers ]
- Optional PS/2 style IRQ1 and IRQ12 latching
o VESA VL interface:
- Conforms to the VESA V2.0 specification
- Optional support for up to two VL masters
o Miscellaneous features: (802G only)
- Full support for shadow RAM, write protection, L1/L2
cacheability for video, adapter, and system BIOS
- Enhanced arbitration scheme
- Transparent 8042 emulation for fast CPU reset and GATEA20
generation
o [Miscellaneous features: ](802GP only)
[- Full support for flash, write protection, L1/L2 ]
[ cacheability for video, adapter, and system BIOS ]
[- Provides Micro Channel bridge support ]
[- 10-/16-nit I/O decodes ]
[- Enhanced arbitration scheme ]
o Packaging:
- Higher integration
- Reduced TTL count
- Low-power, high~speed 0.8-micron CMOS technology
- 208-pin PQFP (Plastic Quad Flat Pack)
**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...
**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
---------------+---------------------------+----------------------------------------
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