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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...
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*HMC (Hulon Microelectronics)...
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*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
**Other alias:
Eurone, Fugu, Fugutech, Hi Sing, Houston, Assa,
H Tech, Matsonic, Minstaple, PCWare, Pine, Warpspeed,
Ability, Alton Aristo, Asia Gate, Asiatech, AddTech Research,
Hedaka, Protac, Hsing Tech,
And probably more.
**Notes:...
**Early Chipsets:...
**Later Chipsets:...
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*VIA...
**VT82C597/AT Apollo VP3, Single-Chip for Pentium with AGP <10/03/97
***Info:
The Apollo-VP3 is a high performance, cost-effective and energy
efficient chip set for the implementation of AGP / PCI / ISA desktop
and notebook personal computer systems based on 64-bit Socket-7 (Intel
Pentium and Pentium MMX; AMD K5 / 5k86 and K6 / 6k86; and Cyrix / IBM
6x86 / M2) super-scalar processors.
The Apollo-VP3 chip set consists of the VT82C597 system controller
(472 pin BGA) and the VT82C586B PCI to ISA bridge (208 pin PQFP). The
VT82C597 system controller provides superior performance between the
CPU, optional synchronous cache, DRAM, AGP bus, and PCI bus with
pipelined, burst, and concurrent operation. For pipelined burst
synchronous SRAMs, 3-1-1-1-1-1-1-1 timing can be achieved for both
read and write transactions at 66 MHz. Four cache lines (16
quadwords) of CPU/cache to DRAM write buffers with concurrent
write-back capability are included on chip to speed up cache read and
write miss cycles.
The VT82C597 supports six banks of DRAMs up to 1GB. The DRAM
controller supports standard Fast Page Mode (FPM) DRAM, EDO-DRAM,
Synchronous DRAM (SDRAM), and SDRAM-II with Double Data Rate (DDR) in
a flexible mix / match manner. The Synchronous DRAM interface allows
zero wait state bursting between the DRAM and the data buffers at
66Mhz. The six banks of DRAM can be composed of an arbitrary mixture
of 1M / 2M / 4M / 8M / 16MxN DRAMs. The DRAM controller also supports
optional ECC (single-bit error correction and multi-bit detection) or
EC (error checking) capability separately selectable on a bank-by-bank
basis.
The VT82C597 also supports full AGP v1.0 capability for maximum bus
utilization including 2x mode transfers, SBA (SideBand Addressing),
Flush/Fence commands, and pipelined grants. An eight level request
queue plus a four level post-write request queue with thirty-two and
sixteen quadwords of read and write data FIFO's respectively are
included for deep pipelined and split AGP transactions. A
single-level GART TLB with 16 full associative entries and flexible
CPU/AGP/PCI remapping control is also provided for operation under
protected mode operating environments.
The VT82C597 supports two 32-bit 3.3 / 5V system buses (one AGP and
one PCI) with 64-bit to 32-bit data conversion. The 82C597 also
contains a built-in bus-to-bus bridge to allow simultaneous concurrent
operations on each bus. Five levels (doublewords) of post write
buffers are included to allow for concurrent CPU and PCI operation.
Consecutive CPU addresses are converted into burst PCI cycles with
byte merging capability for optimal CPU to PCI throughput. For PCI
master operation, forty-eight levels (doublewords) of post write
buffers and sixteen levels (doublewords) of prefetch buffers are
included for concurrent PCI bus and DRAM/cache accesses. The chipset
also supports enhanced PCI bus commands such as Memory-Read-Line,
Memory-Read-Multiple and Memory-Write-Invalid commands to minimize
snoop overhead. In addition, the chipset supports advanced features
such as snoop ahead, snoop filtering, L1 write-back forward to PCI
master and L1 write-back merged with PCI post write buffers to
minimize PCI master read latency and DRAM utilization. The VT82C586B
PCI to ISA bridge supports four levels (doublewords) of line buffers,
type F DMA transfers and delay transaction to allow efficient PCI bus
utilization and (PC I-2.1 compliant). The VT82C586B also includes an
integrated keyboard controller with PS2 mouse support, integrated
DS12885 style real time clock with extended 256 byte CMOS RAM,
integrated master mode enhanced IDE controller with full scatter and
gather capability and extension to UltraDMA-33 / ATA-33 for 33MB/sec
transfer rate, integrated USB interface with root hub and two function
ports with built-in physical layer transceivers, Distributed DMA
support, and OnNow / ACPI compliant advanced configuration and power
management interface. A complete main board can be implemented with
only six TTLs.
The Apollo VP3 chipset is ideal for high performance, high quality,
high energy efficient and high integration desktop and notebook AGP /
PCI / ISA computer systems.
***Configurations:...
***Features:...
**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...
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