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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
Chips:
Memory Access Controller (MAC)
Data Interface Buffer (DIB)
CPUs: 8x P-III Xeon Oct
DRAM Types: SDRAM PC100 2-way Interleave dual channel
Max Mem: 32GB
ECC/Parity: ECC
AGP speed: N/A
Bus Speed: 100
PCI Clock/Bus: 1/3 PCI-66/64
**800 series...
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*VIA...
**VT82C586/A/B PCI Integrated Peripheral Controller <10/13/96
***Info:
The VT82C586A PIPC (PCI Integrated Peripheral Controller) is a high
integration, high performance and high compatibility device that
supports Intel and non-Intel based processor to PCI bus bridge to make
a complete Microsoft PC97 compliant PCI/ISA system. In addition to
complete ISA extension bus functionality, the VT82C586A includes
standard intelligent peripheral controllers:
a) Master mode enhanced IDE controller with dual channel DMA engine
and interlaced dual channel commands. Dedicated FIFO coupled with
scatter and gather master mode operation allows high performance
transfers between PCI and IDE devices. In addition to standard PIO
and DMA mode operation, the VT82C586A also supports the emerging
UltraDMA-33 standard to allow reliable data transfer rates up to
33MB/sec throughput. The IDE controller is SFF-8038i v1.0 and
Microsoft Windows-95 compliant.
b) Universal Serial Bus controller that is USB v1.0 and Universal HCI
v1.1 compliant. The VT82C586A includes the root hub with two function
ports with integrated physical layer transceivers. The USB controller
allows hot plug and play and isochronous peripherals to be inserted
into the system with universal driver support. The controller also
implements legacy keyboard and mouse support so that legacy software
can run transparently in a non-USB-aware operating system environment.
c) Keyboard controller with PS2 mouse support.
d) Real Time Clock with 128 byte extended CMOS. In addition to the
standard ISA RTC functionality, the integrated RTC also includes the
date alarm and other enhancements for compatibility with the emerging
ACPI standard.
e) Notebook-class power management functionality including event
monitoring, CPU clock throttling (Intel processor protocol), power and
leakage control, hardware- and software-based event handling, general
purpose IO, chip select and external SMI. The power management
function supports legacy APM v1.2.
f) Plug and Play controller that allows complete steerability of all
PCI interrupts to any interrupt channel. Two additional interrupt and
DMA channels are provided to allow plug and play and reconfigurability
of on-board peripherals for Windows 95 compliance.
The VT82C586A also enhances the functionality of the standard ISA
peripherals. The integrated interrupt controller supports both edge
and level triggered interrupts channel by channel. The integrated DMA
controller supports type F DMA in addition to standard ISA DMA modes.
Compliant with the PCI-2.1 specification, the VT82C586A supports
delayed transactions so that slower ISA peripherals do not block the
traffic of the PCI bus. Special circuitry is built in to allow
concurrent operation without causing dead lock even in a PCI-to-PCI
bridge environment The chip also includes four levels (doublewords) of
line buffers from the PCI bus to the ISA bus to further enhance
overall system performance.
***Versions:...
***Features:...
**VT82C596/A Mobile PCI Integrated Peripheral Controller <11/05/97...
**VT82C686A/B PCI Super-I/O Integrated Peripheral Ctrl. <02/10/98...
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