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**82335       High-Integration Interface Device For 386SX      c:Nov88
***Notes:...
***Info:
The Intel 82335  is a high integration interface  device used together
with the  82230/82231 to provide  the most cost-effective  and highest
performance  system  design solution  for  AT-compatible 386SX  micro-
processor based systems.

The 82335  DRAM control feature is  designed and optimized  for the 16
MHz 386SX microprocessor bus  architecture. The page mode, interleaved
memory design allows 0 wait  state performance on most memory accesses
with 100 ns DRAM.

Several address  mapping options are available  to provide flexibility
in the system memory size and configuration.

The 82335 also  provides the necessary interface signals  to allow the
387SX numerics  coprocessor to run in  a PC/AT system.  The 82235 with
its  integrated  parity  generation  and  checking·  provides  system
designers with data integrity and reliability.

The  82335 is  a high integration  VLSI companion  chip for  the Intel
386SX 32-bit microprocessor. It interfaces the 386SX microprocessor to
the  80387SX  numeric  coprocessor   and  to  the  82230/82231  highly
integrated peripherals in an  AT compatible system by converting 386SX
processor bus cycles to  80286 compatible cycles, generating necessary
clock signals, and providing local dynamic memory control.  Figure 2.1
[see datasheet] shows a block diagram of this system.

The 82335 is composed of seven functional blocks:
1. DRAM Controller
2. Address Mapper/Decoder
3. Ready Generator
4. Bus Cycle Translator
5. Math Coprocessor Interface
6. Clock Generator/Reset Synchronizer
7. Parity Generator/Checker


***Versions:...
***Features:...
**82360SL     I/O Subsystem                                   10/05/90...
**82370       Integrated System Peripheral (for 82376)         c:Oct88...
**82371FB/SB  PCI ISA IDE Xcelerator 82371FB/82371SB (PIIX/3) 01/31/95...
**82371MX     Mobile PCI I/O IDE Xcelerator (MPIIX)           11/01/95...
**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97...
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB)   c:Mar93...
**82378       System I/O (SIO) (82378IB and 82378ZB)           c:Mar93...
**82379AB     System I/O-APIC (SIO.A)                           <Dec94...
**82380       32-bit DMA Controller w/ Integrated Peripherals 02/01/87...
**82380FB/AB  PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384       Clock Generator and Reset Interface                  c86...
**82385       32-bit Cache Controller for 80386               09/29/87...
**82385SX     32-bit Cache Controller for 80386SX             01/25/89...
**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
***Notes:
date source:TimelineDateSort7_05.pdf

Information taken from: 82495XP.pdf (Dec '92)
***Info:...
***Features:...
**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:
Chips:
[82454NX] (PXB) [82453NX] (MUX) 
[82452NX] (RCG) [82451NX] (MIOC) 
[82371EB] (PIIX4E),                            
CPUs:          Single/Dual/Quad P-II Xeon/P-III Xeon
DRAM Types:    FPM EDO 2-way Interleave 4-way Interleave
Mem Rows:      8
DRAM Density:  16Mbit 64Mbit
Max Mem:       8GB
ECC/Parity:    Both
AGP speed:     N/A
Bus Speed:     100
PCI Clock/Bus: 1/3


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