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**A note on VESA support of 486 chipsets.
Many chipsets state that they support VESA local bus. In some cases
these actually implement VLB somewhat like PCI, where it is entirly
decoupled from the CPU bus. Chipsets that do not state they work with
VLB, may be found on motherboards that contain VLB slots. VLB
is *basically* The 486 CPU pinout in a slot form. Unless these
m/boards contain some additional chips, there VLB implementation is
directly coupled to the CPU.
**Datasheets:...
*_IBM...
*ACC Micro...
*ALD...
*ALi...
*AMD . . . . . . . [no datasheets, some info]...
*Chips & Technologies...
*Contaq . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82395SX Smart Cache 12/17/90
***Notes:...
**82396SX Smart Cache 12/17/90...
**82485 Turbo Cache (and 485Turbocache) c90...
**82489DX Advanced Programmable Interrupt Controller 10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set <Sep91...
**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)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**SL9351 80386DX Page Interleave Memory Controller (33MHz) ?
***Info:...
***Versions:...
***Features:...
**SL9352 80386DX System and Memory Controller <06/12/90...
**SLXXXX Other chips...
**
**VT82C470 "Jupiter", Chip Set (w/o cache) 386 [no datasheet] ?
**VT82C475 "Jupiter", Chip Set (w/cache) 386 [no datasheet] ?
**VT82C486/2/3 "GMC chipset" [no datasheet, some info] ?...
**VT82C495/480 "Venus" Chip Set [no datasheet] ?
**VT82C495/491 ? EISA Chip Set [no datasheet, some info] <93...
**VT82C496G Pluto, Green PC 80486 PCI/VL/ISA System <05/30/94
***Info:...
***Configurations:...
***Features
1. Fully IBM PC/AT Compatible
2. Flexible CPU and Local Bus Interface
- Supports 80486SX/DX/DX2/DX4 and compatible CPUs
- CPU speed up to 100 Mhz including 80486DX-50, 80486DX2-66 and
80486DX4-100
- Supports CPUs with write-back internal cache, e.g. P24D, P24T
and Cx486DX/DX2
- Snoop filtering for write-back CPUs
- Supports SMI protocols of Intel, AMD, TI and Cyrix CPUs
- CPU clock stretching and throttling
- Zero frequency and zero voltage CPU suspend
- Soft and hard CPU reset
- Direct VESA and other local bus interface with DMA/master access
- Built-in arbitration for two local bus masters
3. Advanced Cache Controller
- Write back/write through scheme
- Direct map scheme
- Flexible cache size: 0K/32K/64K/128K/256K/512K/1MB
- One bank or two banks of data independent of cache size
- Integrated 8-bit tag comparator
- Interleaved SRAM access to achieve 2-1-1-1 burst fill
- Supports burst read and burst write transfers
- System and video BIOS cacheable and write-protect
- Programmable cache timing
- Programmable non-cacheable region
- Optional combined tag and alter bit SRAM for the write-back
scheme
- Eight bit tag under the combined tag-alter scheme without
sacrifice of cacheable space
4. Fast Page Mode DRAM Controller
- Mixed 256K/512K/1M/2M/4M/8M/16MxN DRAMs
- 8 banks up to 128MB
- Flexible column and row addresses
- 30 pin (x9) and single/double density 72 pin (x36) SIMM
module support
- Programmable DRAM timing
- BIOS shadow at 16KB increment
- 256/384K memory relocation
- System management memory remapping
- Decoupled DRAM refresh with staggered RAS timing
- CAS-before-RAS and slow refresh
5. Synchronous ISA Bus Controller
- Synchronous ISA bus clock
- Programmable wait state, command delay and IO recovery time
- Bus conversion and data alignment
- Hardware and software de-turbo control
- Fast reset and Gate A20 operation
- Integrated 82C206 peripheral controller
- Edge trigger or level sensitive interrupt controller
- Flash EPROM and combined BIOS support
6. Integrated Power Management Unit
- Normal, conserve, doze, sleep and suspend modes
- System event monitoring with two event classes and two idle
timers
- Primary and secondary interrupt differentiation for individual
channels
- One extended peripheral timer and one general purpose timer
- Automatic conserve mode operation for short and frequent system
idleness
- Modular clock and modular power
- CPU clock stretching, throttling or stop without affecting the
ISA bus clock
- Zero frequency operation with automatic resume
- Zero volt operation with leakage control
- Four general purpose IO or power control ports
- APM 1.1 compliant
7. Integrated Local Bus IDE Controller
- 32-bit host data transfer
- Mode-3 transfer capabilities (>10MB/s)
- Programmable read/write, master/slave and active/recovery timing
in units of CPU clock
- Prefetch and write buffers
- Support either primary (1F0-1F7h) or secondary (170-177h)
channel with two devices
- No external logic required
8. High Integration and Complete Functionality
- Glueless interface with the VT82C406MV IXP (Integrated X-bus
Peripheral Controller, 100PQFP) to eliminate the multi-clock
generator, the keyboard controller with PS2 mouse, the DS-1285
style real time clock with extended CMOS RAM and the address
buffers.
- 9 TTLs for a complete main board implementation
- Optional VT82C505 (160 PQFP) to bridge a VL/ISA system to the
PCI bus
9. 0.8um high speed and low power CMOS process
10. 208-pin PQFP package
**VT82C530MV 3.3V Pentium chipset [no datasheet, some info]<05/30/94...
**VT82C570M Apollo Master, Green Pentium/P54C <06/22/95...
**VT82C580VP Apollo VP, Pentium/M1/K5 PCI/ISA System <02/15/96...
**VT82C580VPX Apollo VPX, VPX/97, Pentium with 66/75MHz Bus <01/09/97...
**VT82C590 Apollo VP2, VP2/97, Single-Chip Pentium 66MHz <01/10/97...
**VT82C597/AT Apollo VP3, Single-Chip for Pentium with AGP <10/03/97...
**VT82C598MVP Apollo MVP3,Single-Chip 66/75/83/100MHz & AGP <09/22/97...
**VT8501 Apollo MVP4,Single-Chip 66-100MHz & AGP <11/04/98...
**VT82C680 Apollo P6, Pentium-Pro Chip Set <08/30/96...
**Support chips:
**VT82C505 Pentium/486 VL to PCI Bridge <05/30/94...
**VT82C586/A/B PCI Integrated Peripheral Controller <10/13/96...
**VT82C596/A Mobile PCI Integrated Peripheral Controller <11/05/97...
**VT82C686A/B PCI Super-I/O Integrated Peripheral Ctrl. <02/10/98...
**Later P-Pro/II/III/Celeron...
**Later AMD...
**Other...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...
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