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**82485 Turbo Cache (and 485Turbocache) c90
***Notes:...
***Info:
The 82485 is a second-level cache controller designed to improve the
performance of Intel486 Microprocessor systems. One 82485 cache
controller supports 64K or 128K bytes of second level cache memory
that maps to the entire 4 Gigabytes of the Intel486 microprocessor
address space. The controller is completely software transparent. One
controller plus SRAMs provides a 64K or a 128K cache. External EPROM
can be cached yet remain write protected. The 82485 is fully
compatible with the Intel486 microprocessor. All Intel486 CPU bus
cycles and timings are supported.
A complete, optional second level cache controller using the 82485 is
available as the 485Turbocache Module from Intel (data sheet order
number 240722).
2.0 FUNCTIONAL DESCRIPTION
2.1 Introduction
The 82485 is a single ported, two-way set associative cache controller
designed specifically to interface with the Intel486 microprocessor.
The controller supports either a sectored configuration (two lines per
tag) or a non-sectored configuration (one line per tag). The 82485
will directly support a nonsectored 64K data cache or a 128K sectored
data cache. Both the 64K and 128K configurations are able to map the
entire 4 gigabytes of the Intel486 microprocessor address space. The
82485 interfaces directly to the Intel486 microprocessor. All Intel-
486 CPU bus cycles and timings are supported. The 82485 also supports
0 wait state processor operation when there is a cache hit and has
provisions to support invalidation cycles, BOFF# cycles, and premature
BLAST# terminations. The controller is look aside (monitors bus act-
ivity in parallel to the processor) and write through (all writes pro-
pagate to the system bus), so it supports the same cache consistency
mechanisms as the Intel486 CPU. The controller also provides a safe
method to cache ROM BIOS through the use of a write protect pin and a
write protect strapping option.
The data cache (Static RAM) resides external to the 82485. The 82485
provides all controls for the SRAMs. No external latches or tran-
ceivers are required. The 82485 output buffers support up to eight
SRAMs. A 64K cache can be designed with only five components; nine
components for a 128K cache. Two-way set associativity is provided by
dual banked SRAMs. Data parity is supported.
The 82485 can be used to design a custom second level cache
configuration. For an easier system design and higher integration, the
82485M Turbocache can be used (see data sheet order number 240722).
This module is a complete second level cache in one package. It
consists of a single 82485 cache controller and SRAM to provide a
complete 64K or 128K second level Intel486 microprocessor second level
cache.
***Versions:...
***Features:...
**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...
**82C496/7 DXBB PC/AT Chipset (Cached) <01/16/92
***Info:...
***Configurations:...
***Features:...
**82C498 DXWB PC/AT chipset [no datasheet] ?...
**82C499 DXSC DX System Controller c:93...
**82C546/547 Python PTM3V c:94...
**82C556/7/8 Viper [no datasheet] ?...
**82C556/7/8N Viper-N Viper Notebook Chipset <05/25/95...
**82C556M/7M/8E Viper-N+ Viper Notebook Chipset c:96
***Notes:...
***Info:...
***Configurations:...
***Features:...
**82C566/7/8 Viper-Max Chipset Scalable MultiMedia PC Solution ?...
**82C571/572 486/Pentium c:93...
**82C576/7/8 Viper Xpress [no datasheet] ?...
**82C576/8/9 Viper XPress+ [no datasheet, some info] <01/16/97...
**82C596/597 PTMAWB Pentium Adaptive Write-back (Cobra) c:93...
**82C650/1/2 Discovery (Pentium Pro) [no datasheet] ?...
**82C681/2/6/7 386/486WB EISA c:92...
**82C683 386/486AWB EISA [no datasheet] ?...
**82C693/6/7 Pentium uP Write Back Cache EISA c:93...
**82C700 FireStar c:97...
**82C701 FireStar Plus c:97...
**82C750 Vendetta [no datasheet] ?...
**82c801 SCWB2 DX Single Chip Solution c:92...
**82C802 SCWB2 PC/AT Single Chip [no datasheet] ?...
**82C802G/GP System/Power Management Controller (cached) c:93...
**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:
OPTi 82C200 - ChromaCast LCD-VGA chipset
OPTi 82C205 - LCD panel controller / scalar
OPTi 82C264 - 2D VGA controller
OPTi 82C265 - Video ????????????????????????????
OPTi 82C268 - Video ????????????????????????????
OPTi 82C611 - EIDE VLB
OPTi 82C611A - EIDE VLB
OPTi 82C621 - PCI-to-IDE controller
OPTi 82C621A - PCI-to-IDE controller
OPTi 82C824 - FireFox PCI to PCMCIA Controller
OPTi 82C825 - FireBridge II PCI to PCMCIA Controller
OPTi 82C814 - Docking Station Controller for laptops (PCI-to-PCI bridge)
OPTi 82C842 - PCI-to-IEEE 1393 FireWire
OPTi 82C832 - ?????????????????????????????????????????
OPTi 82C861 - PCI-to-USB Bridge c1997
OPTi 82C862 - PCI-to-USB Bridge 4x port
OPTi 82C863 - PCI-to-USB Bridge 2x port
OPTi 82C871 - PCI-to-USB Bridge + Sound Blaster compatibility and USB 2.0
OPTi 82C916 - Audio, ISA, serial CODEC) used in combination with Vendetta chipset 82C750
OPTi 82C924 - Audio, ISA
OPTi 82C925 - ISA Audio Controller (replaces the 924)
OPTi 82C928 - (MAD16) ISA Audio Controller (Emulates Sound Blaster Pro) c1993
OPTi 82C929 - (MAD16 Pro) ISA Audio Controller (Emulates Sound Blaster Pro) c1994
OPTi 82C930 - ISA Audio Controller (Emulates Sound Blaster Pro, AdLib)
OPTi 82C931 - ISA Audio controller (Emulates Sound Blaster Pro, AdLib)
OPTi 82C933 - Audio ?????????????????????????????
OPTi 82C935 - EV1935 ECTIVA MachOne PCI Audio
OPTi 82C941 - Wavetable chip, has something to do with 82C930
OPTi 82C950 - (MAD32) Audio/Modem controller (Emulates Sound Blaster Pro) c1994
OPTi 92C160 - Clock Generator for 92C168
OPTi 92C168 - LCD VGA controller c1993
OPTi 92C178 - LCD VGA controller with blt c1993
OPTi 92C264 - 2D VGA controller
-------------------------------------------------
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