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**CS4021 ISA/486 (84021/84025) c92
***Info: ...
***Configurations:
84021 + 84025
Note: both have no name. The datasheet confusingly refers to the 4021
CHIPSet as consisting of the 4021 CHIPSet and 4025 CHIPSet, i.e
recursive terminology.
This is also compatible with the Wingine chipset. When combined with
Wingine this becomes the CS4000 chipset.
***Features:
o Supports 486DX, 486DX2, 486SX, and Super386 CPUs
o Supports 487 and 4167 in 486 CPU mode and 367, 3167 in 386 CPU
mode.
o SuperState V support for the Super38605
o Burst Mode support in cache and DRAM modes
o Zero wait state Weitek support
o 64K, 128K, 256K, and 512K cache size
o Direct-mapped, write back operation, with pipeline allocate on
read miss
o Internal tag comparator
o Zero wait state writes
o 2-1-1-1 burst for cache reads to the 486 and 486SX
o Two-way interleaved data RAMs
o Posted writes to DRAM
o 3-1-1-1 burst read with 486SX CPU at 20MHz with no cache
o 256K, 1M, and 4M deep DRAM support
o Supports 4Mx4 DRAMs with 12/10 or 11/11 addressing
o Support for 9-bit DRAM SIMS or 36-bit DRAM SIMMs
o Page mode RAM access with option of using page interleaving
o Up to 8 banks of 36-bit DRAMs
o CAS before RAS refresh for low power consumption
o Option of using asynchronous or synchronous AT clock source
o Classic, hidden, or disabled refresh
o Fast 12MHz AT bus support
o Dual-ported VRAM interface
o Local bus master and slave support
**CS4031 CHIPSet (84031/84035) 5/10/93...
**CS4041/5 CHIPSet (84041/84045) 2/10/95...
**CB8291 ELEAT [no datasheet] c90...
**CB8295 ELEATsx [no datasheet] c90...
**82C100 IBM PS/2 Model 30/Super XT ?...
**82C110 IBM PS/2 Model 30/Super XT ?...
**82C235 Single Chip AT (SCAT) c89...
**82C836 Single Chip 386sx (SCATsx) <91...
**F8680/A PC/CHIP Single-Chip PC c93...
**
**Support Chips:
**64200 (Wingine) High Performance 'Windows Engine' c:Oct91...
**82C206 Integrated Peripheral Controller c86...
**82C601/A Single Chip Peripheral Controller <08/30/90...
**82C607 Multifunction Controller <Jun88...
**82C710 Universal Peripheral Controller c:Aug90...
**82C711 Universal Peripheral Controller II c:Jan91...
**82C712 Universal Peripheral Controller II c:Jan91...
**82C721 Universal Peripheral Controller III c:May93...
**82C735 I/O Peripheral Controller With Printgine c:Jul93...
**82C835 Single CHIP 386sx AT Cache Controller c:Apr91...
**F87000 Multi-Mode Peripheral Chip 11/23/93...
**Other:...
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*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...
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