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**ACC2086 486 VL-based System Super Chip Soluti[no datasheet] ?
***Notes:...
***Info:...
***Configurations:...
**ACC2087 Enhanced Super Chip (486 Single Chip) <Aug96...
**ACC2089 486 PCI-based System Super Chip [no datasheet] ?...
**ACC2168/GT 32-bit 486 Green System Single Chip [no datasheet] ?...
**ACC2178A 32-bit 486 Green System Single Chip [no datasheet] ?...
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**ACC???? Maple/Maple-133 486-System-On-Chip [no datasheet] ?...
**
**Support Chips:
**ACC2016 Buffer and MUX Logic c96...
**ACC2020 Power Management Chip c92...
**ACC5500 Multifunction I/O Control Chip for PS2 Model 50/60 c88...
**
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*Intel...
**82385SX 32-bit Cache Controller for 80386SX 01/25/89
***Notes:...
***Info:
The 82385SX Cache Controller is a high performance peripheral for
Intel's 386 SX Microprocessor. It stores a copy of frequently accessed
code and data from main memory in a zero wait state local cache
memory. The 82385SX allows the 386 SX Microprocessor to run near its
full potential by reducing the average number of CPU wait states to
nearly zero. The dual bus architecture of the 82385SX allows other
masters to access system resources while the 386 SX CPU operates
locally out of its cache. In this situation, the 82385SX's "bus
watching" mechanism preserves cache coherency by monitoring the system
bus address lines at no cost to system or local throughput.
The 82385SX is completely software transparent, protecting the
integrity of system software. High performance and board space savings
are achieved because the 82385SX integrates a cache directory and all
cache management logic on one chip.
1.0 82385SX FUNCTIONAL OVERVIEW
The 82385SX Cache Controller is a high performance peripheral for
Intel's 386 SX microprocessor. This chapter provides an overview of
the 82385SX, and of the basic architecture and operation of a 386 SX
CPU/ 82385SX system.
1.1 82385 OVERVIEW
The main function of a cache memory system is to provide fast local
storage for frequently accessed code and data. The cache system
intercepts 386 SX memory references to see if the required data
resides in the cache. If the data resides in the cache (a hit), it is
returned to the 386 SX without incurring wait states. If the data is
not cached (a miss), the reference is forwarded to the system and the
data retrieved from main memory. An efficient cache will yield a high
"hit rate" (the ratio of cache hits to total 386 SX accesses), such
that the majority of accesses are serviced with zero wait states. The
net effect is that the wait states incurred in a relatively infrequent
miss are averaged over a large number of accesses, resulting in an
average of nearly zero wait states per access. Since cache hits are
serviced locally, a processor operating out of its local cache has a
much lower "bus utilization" which reduces system bus bandwidth
requirements, making more bandwidth available to other bus masters.
The 82385SX Cache Controller integrates a cache directory and all
cache management logic required to support an external 16 Kbyte
cache. The cache directory structure is such that the entire physical
address range of the 386 SX is mapped into the cache. Provision is
made to allow areas of memory to be set aside a non-cacheable. The
user has two cache organization options: direct mapped and 2-way set
associative. Both provide the high hit rates necessary to make a
large, relatively slow main memory array look like a fast, zero wait
state memory to the 386 SX.
A good hit rate is an essential ingredient of a successful cache
implementation. Hit rate is the measure, of how efficient a cache is
in maintaining a copy of the most frequently requested code and data.
However, efficiency is not the only factor for performance
consideration. Just as essential are sound cache management policies.
These policies refer to the handling of 386 SX writes, preservation of
cache coherency, and ease of system design. The 82385SX's "posted
write" capability allows the majority of 386 SX writes, including
non-cacheable, to run with zero wait states, and the 82385SX's "bus
watching" mechanism preserves cache coherency with no impact on system
performance. Physically, the 82385SX ties directly to the 386 SX with
virtually no external logiC.
***Versions:...
***Features:...
**82395DX High Performance Smart Cache 06/18/90...
**82395SX Smart Cache 12/17/90...
**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...
*Headland/G2...
*HMC (Hulon Microelectronics)...
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*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
**5581/5582 (Jessie) Pentium PCI/ISA Chipset (75MHz) <04/15/97
***Info:...
***Configuration:...
***Features:
o Support Intel Pentium CPU and other compatible CPU host bus at
50/55/60/66/75 MHz
o Support CPU with MMX feature
o Support the Pipelined Address Mode of Pentium CPU
o Support the Full 64-bit Pentium Processor data Bus
o Meet PC97 Requirements
o Integrated Second Level (L2) Cache Controller
- Write Back Cache Modes
- 8 bits or 7 bits Tag with Direct Mapped Cache Organization
- Integrated 16K bits Dirty RAM
- Support Pipelined Burst SRAM
- Support 256 KBytes and 512 KBytes Cache Sizes
- Cache Hit Read/Write Cycle of 3-1-1-1
- Cache Back-to-Back Read/Write Cycle of 3-1-1-1-1-1-1-1
o Integrated DRAM Controller
- Support 6 RAS Line (3 Banks) of FPM/EDO/SDRAM DIMMs/SIMMs
- Support 2Mbytes to 384Mbytes of main memory
- Support Cacheable DRAM Sizes up to 128 MBytes.
- Support 256K/512K/1M/2M/4M/8M/16M/32M x N FPM/EDO/SDRAM DRAM
- Support 64 Mb DRAM Technology
- Support 3.3V or 5V DRAM.
- Supports Symmetrical and Asymmetrical DRAM.
- Support 32 bits/64 bits mixed mode configuration
- Support Concurrent Write Back
- Support CAS before RAS Refresh
- Support Relocation of System Management Memory
- Programmable CAS#, RAS#, RAMWE# and MA Driving Current.
- Fully Configurable for the Characteristic of Shadow RAM (640
KBytes to 1 MBytes)
- Support FPM DRAM 5-3-3-3(-3-3-3-3) Burst Read Cycles
- Support EDO DRAM 5-2-2-2(-2-2-2-2) Burst Read Cycles
- Support SDRAM 6-1-1-1(-2-1-1-1) Burst Read Cycles
- Support X-1-1-1/X-2-2-2/X-3-3-3 Burst Write Cycles
- Support 8 Qword Deep Buffer for Read/Write Reordering, Dword
Merging and 3/2-1-1-1 Post write Cycles
- Two Programmable Non-Cacheable Regions
- Option to Disable Local Memory in Non-Cacheable Regions
- Shadow RAM in Increments of 16 KBytes
o Integrated PMU Controller
- Meet ACPI Requirements
- Support Both ACPI and Legacy PMU
- Support Suspend to Disk
- Support SMM Mode of CPU
- Support CPU Stop Clock
- Support Power Button for ACPI function
- Support Automatic Power Control for system power off function
- Support Modem Ring-in, RTC Alarm Wake up
- Support Thermal Detection
- Support GPIOs, and GPOs for External Devices Control
- Support Programmable Chip Select
o Provides High Performance PCI Arbiter.
- Support up to 5 PCI Masters
- Support Rotating Priority Mechanism
- Hidden Arbitration Scheme Minimizes Arbitration Overhead.
- Support Concurrency between CPU to Memory and PCI to PCI
o Integrated Host-to-PCI Bridge
- Support Asynchronous and Synchronous PCI Clock
- Translates the CPU Cycles into the PCI Bus Cycles
- Provides CPU-to-PCI Read Assembly and Write Disassembly
Mechanism
- Translates Sequential CPU-to-PCI Memory Write Cycles into PCI
Burst Cycles
- Zero Wait State Burst Cycles
- Support IDE Posted Write
- Support Pipelined Process in CPU-to-PCI Access
- Support Advance Snooping for PCI Master Bursting
- Maximum PCI Burst Transfer from 256 Bytes to 4 KBytes
o Integrated Posted Write Buffers and Read Prefetch Buffers to
Increase System Performance
- CPU-to-Memory Posted Write Buffer (CTMFF) with 8 QW Deep,
Always Sustains 0 Wait Performance on CPU-to-Memory.
- CPU-to-Memory Read Buffer with 4 QW Deep
- CPU-to-PCI Posted Write Buffer(CTPFF) with 8 DW Deep
- PCI-to-Memory Posted Write Buffer(PTHFF) with 8 QW Deep,
Always Streams 0 Wait Performance on PCI-to/from-Memory Access
- PCI-to-Memory Read Prefetch Buffer(CTPFF) with 8 QW Deep
o Integrated PCI-to-ISA Bridge
- Translates PCI Bus Cycles into ISA Bus Cycles
- Translates ISA Master or DMA Cycles into PCI Bus Cycles
- Provides a Dword Post Buffer for PCI to ISA Memory cycles
- Two 32 bit Prefetch/Post Buffers Enhance the DMA and ISA Master
Performance
- Fully Compliant to PCI 2.1
o Enhanced DMA Functions
- 8-, 16- bit DMA Data Transfer
- ISA compatible, and Fast Type F DMA Cycles
- Two 8237A Compatible DMA Controllers with Seven Independent
Programmable Channels
- Provides the Readability of the two 8237 Associated Registers
- Support Distributed DMA
o Built-in Two 8259A Interrupt Controllers
- 14 Independently Programmable Channels for Level- or Edge-
triggered Interrupts
- Provides the Readability of the two 8259A Associated Registers
- Support Serial IRQ
o Three Programmable 16-bit Counters compatible with 8254
- System Timer Interrupt
- Generates Refresh Request
- Speaker Tone Output
- Provides the Readability of the 8254 Associated Registers
o Built-in Keyboard Controller
- Hardwired Logic Provides Instant Response
- Support PS/2 Mouse interface
- Support Hot Key "Wake-up" Function
- Capable of Enable/Disable Internal KBC and PS2 Mouse
o Built-in Real Time Clock(RTC) with 256B CMOS SRAM
- Built-in up to one Month Alarm for ACPI
o Fast PCI IDE Master/Slave Controller
- Bus Master Programming Interface for ATA Windows 95 Compliant
Controller
- Support PCI Bus Mastering
- Plug and Play Compatible
- Support Scatter and Gather
- Support Dual Mode Operation - Native Mode and Compatibility
Mode
- Support IDE PIO Timing Mode 0, 1, 2 ,3 and 4
- Support Multiword DMA Mode 0, 1, 2
- Support Ultra DMA/33
- Two Separate IDE Bus
- Two 16 Dword FIFO for PCI Burst Transfers.
o Universal Serial Bus Host Controller
- OpenHCI Host Controller with Root Hub
- Two USB ports
- Support Over Current Detection
- Support Legacy Devices
o Support I2C serial Bus
o Support the Reroutibility of the four PCI Interrupts
o Support 2Mb Flash ROM Interface
o Support NAND Tree for ball connectivity testing
o 553-Balls BGA Package
o 0.35μm 3.3V Technology
**5591/5592/5595 (David) Pentium PCI A.G.P. Chipset <01/09/98...
**5596/5513 (Genesis) Pentium PCI Chipset <03/26/96...
**5597/5598 (Jedi) Pentium PCI/ISA Chipset <04/15/97...
**530/5595 (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**540 (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x SoC (System-on-chip) <03/14/02...
**
**Support chips:
**85C206 Integrated Peripheral Controller [no datasheet] ?...
**5595 Pentium PCI System I/O <12/24/97...
**950 LPC I/O <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**VT82C596/A Mobile PCI Integrated Peripheral Controller <11/05/97
***Info:...
***Versions:...
***Features:...
**VT82C686A/B PCI Super-I/O Integrated Peripheral Ctrl. <02/10/98...
**Later P-Pro/II/III/Celeron...
**Later AMD...
**Other...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
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