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**82495XP/490XP Cache Controller / Cache RAM (for i860) 06/05/91
***Notes:...
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**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...
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**SL82C465 Cache Controller (for 486/386DX/SX) c:91
***Info:
The SL82C465 cache controller supports both 1X and 2X clock modes. The
1X clock mode means that the CCLK2 signal is used as the CPU clock;
the 2X clock mode means that the PCLK signal (half the frequency and
the phase indicator of CCLK2) is used as the CPU clock. The SL82C465
and other CPU local bus devices run at the same clock frequency as the
CPU, while the rest of the system runs at the frequency of PCLK. In
other words, the operating frequency of the system logic is either the
same (2X clock mode) or half the speed of the CPU (1X clock mode). For
the 1X clock mode, the timing of the signals between the CPU/Cache and
the system logic interface is converted by the SL82C465 automatically
to satisfy the requirement of individual clocks. Table 1-1 [see
datasheet] lists the operating frequencies of the CPU local bus and
the system logic with the oscillator used.
The 2X clock mode is recommended for a CPU frequency no faster than
33Mhz because the system logic is available at the targeted speed and
the performance is slightly better than if 1X clock mode were
used. For a CPU frequency faster than 33Mhz, the 1X clock mode is
preferred for 486 systems because it becomes increasingly more
difficult to build a reliable system with an oscillator faster than
66Mhz.
***Versions:...
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*Western Digital...
**WD7855 System controller for 80386SX <09/25/92
***Notes:...
***Info:
1.3 GENERAL DESCRIPTION
Western Digital's WD7855/LV single chip ISA System Controller is
designed for high-performance IBM PC/AT compatible platforms.
Available for desktop, portable or low voltage (LV) applications, the
WD7855/LV supports the 803868X microprocessor operating at speeds up
to 33 MHz.
The WD7855/LV incorporates seven high-performance system controller
functions which include the ISA bus interface, CPU interface, flexible
memory controller, DMA controller, interrupt controller, timers and
advanced power management. In combination with Western Digital’s
support devices, the WD7855/LV provides a highly flexible and powerful
desktop or portable platform design.
The WD7855/LV is designed to work with all variations of 80386SX
compatible microprocessors. It supports the traditional dynamic CPUs
with the industry's only Processor Power-down feature to minimize
power consumption. The WD7855/LV fully supports static microprocessors
such as the AMD Am386SXL with CPU Stop Clock, System Management
Interrupt and I/O trapping features. The WD7855/LV incorporates
special circuitry which allows for optimizing the cache performance
and maintaining cache coherency with cached CPUs such as the Cyrix
Cx4868LC.
1.3.1 Desktop Applications
The WD7855 provides a high performance solution with a flexible memory
controller architecture, including support for eight banks of two way
interleave memory and EMS 4.0 hardware. The WD7855/LV can fully
support an external look-aside cache or a combination primary and
secondary cache. This feature makes it particularly suitable for use
with cached microprocessors such as Cyrix Cx486SLC where it maintains
cache coherency via its built-in bus snooping capability. In addition,
the WD7855/LV supports Video Local Bus Interface (VLBI) for enhanced
graphics performance.
1.3.2 Portable Applications
The WD7855LV is an ideal choice because of its advanced power
management features and power saving 3.3 volt operation which delivers
long battery life in a compact footprint. This makes it a perfect
choice for laptop, notebook, pen based and palmtop computers.
The eight bank memory controller on the WD7855LV provides the user
with great flexibility in the selection of 3.3 volt DRAMs to meet
system memory requirements in low voltage platforms. The WD7855LV
memory controller supports JEDEC standard 3.3 volt DRAM in various
configurations, including the JEIDA standard 88-pin DRAM card.
The WD7855/LV can be paired with the appropriate support devices from
Western Digital to deliver the most efficient solution for any
platform. For 5 volt desktop or portable platforms, the WD7855LV can
be used with the WD76C20 Peripheral Controller and the WD76C30 I/O
Controller. Alternatively, the WD7855 can be used with the WD7615
Buffer Manager device and a generic Super I/O chip to implement a low
cost desktop platform. For 3.3 volt applications, the WD7855LV can be
used with the WD76C20ALV and WD76C30ALV, both of which incorporate
level translators (split rail operation). For subnotebook and palmtop
type applications, WD7625LV buffer manager can be added to the
WD7855LV based solution to achieve a very compact footprint.
The WD7855/LV is a fourth generation system controller device derived
from core chips with proven compatibility and design maturity in
several of the industry’s leading desktop and portable platforms.
Designed with the state of the art 0.9 micron high performance CMOS
process, the WD7855/LV family maintains architectural compatibility
with Western Digital's WD7600 and WD7700 systems logic chip sets while
incorporating many additional performance enhancements.
***Configurations:...
***Features:...
**WD7900/LP/LV System Chip Set for 80286 or 80386SX (Cache) <11/25/91...
**WD8110 System controller for 80386DX/486 <11/30/93...
**
**Support Chips:
**WD76C20x Floppy, RTC, IDE and Support Logic Device <11/25/91...
**WD76C30x Perip. Ctrl, Interrupt Multiplex, and Clock Gen <11/18/91...
**WD7615 Desktop Buffer Manager <04/15/92...
**WD7625 Desktop Buffer Manager <10/01/92...
**WD8120LV Super I/O [no datasheet] ?
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