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**82371AB     PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4)     02/17/97
***Notes:...
***Info:...
***Versions:...
***Features:
o   Supported Kits for both Pentium and Pentium II Microprocessors
    - 82430TX ISA Kit
    - 82440LX ISA/DP Kit
o   Multifunction PCI to ISA Bridge
    - Supports PCI at 30 MHz and 33 MHz
    - Supports PCI Rev 2.1 Specification
    - Supports Full ISA or Extended I/O (EIO) Bus
    - Supports Full Positive Decode or Subtractive Decode of PCI
    - Supports ISA and EIO at 1/4 of PCI Frequency
o   Supports both Mobile and Desktop Deep Green Environments
    - 3.3V Operation with 5V Tolerant Buffers
    - Ultra-low Power for Mobile Environments Support
    - Power-On Suspend, Suspend to RAM, Suspend to Disk, and Soft-
      OFF System States
    - All Registers Readable and Restorable for Proper Resume
      from 0.V Suspend
o   Power Management Logic
    - Global and Local Device Management
    - Suspend and Resume Logic
    - Supports Thermal Alarm
    - Support for External Microcontroller
    - Full Support for Advanced Configuration and Power Interface
      (ACPI) Revision 1.0 Specification and OS Directed Power 
      Management
o   Integrated IDE Controller
    - Independent Timing of up to 4 Drives
    - PIO Mode 4 and Bus Master IDE Transfers up to 14 Mbytes/sec
    - Supports "Ultra DMA/33" Synchronous DMA Mode Transfers up to  
      33 Mbytes/sec
    - Integrated 16 x 32-bit Buffer for IDE POI Burst Transfers
    - Supports Glue-less "Swap-Bay" Option with Full Electrical 
      Isolation
o   Enhanced DMA Controller
    - Two 82C37 DMA Controllers
    - Supports PCI DMA with 3 PC/PCI Channels and Distributed DMA
      Protocols (Simultaneously)
    - Fast Type-F DMA for Reduced PCI Bus Usage
o   Interrupt Controller Based on Two 82C59
    - 15 Interrupt Support
    - Independently; Programmable for Edge/Level Sensitivity
    - Supports Optional I/O APIC
    - Serial Interrupt Input
o   Timers Based on 82C54
    - System Timer, Refresh Request, Speaker Tone Output
o   USB
    - Two USB 1.0 Ports for Serial Transfers at 12 or 1.5 Mbit/sec
    - Supports Legacy Keyboard and Mouse Software with USB-based
      Keyboard and Mouse
    - Supports UHCI Design Guide
o   SMBus
    - Host Interface Allows CPU to Communicate Via SMBus
    - Slave Interface Allows External SMBus Master to Control 
      Resume Events
o   Real-Time Clock
    - 256-byte Battery-Back CMOS SRAM
    - Includes Date Alarm
    - Two 8-byte Lockout Ranges
o   Microsoft Win95 Compliant
o   324 mBGA Package

**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:...
***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:...
**?????  (Profusion)    c:99...
**800 series...
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*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
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*TI (Texas Instruments)...
**SN74LS610/2 IBM AT: SN74LS610, SN74LS612 Memory Mappers          <84
***Notes:...
***Info:
Each 'LS610  and 'LS612  memory mapper  integrated circuit  contains a
4-line to  16-line decoder, a  16-word by  12-bit RAM, 16  channels of
2-line to 1-line multiplexers, and  other miscellaneous circuitry on a
monolithic chip. Each  'LS610 also contains 12 latches  with an enable
control.

The memory  mappers are designed  to expand a  microprocessor's memory
addressing capability by  eight bits. Four bits of  the memory address
bus (see  System Block Diagram)[see  datasheet] can be used  to select
one of 16 map registers that contain  12 bits each.  these 12 bits are
presented  to the  system memory  address bus  through the  map output
buffers  along with  the  unused  memory address  bits  from the  CPU.
However, addressable memory space  without reloading the map registers
is the  same as would  be available with  the memory mapper  left out.
The  addressable  memory  space  is  increased  only  by  periodically
reloading the  map registers  from the  data bus.   This configuration
lends itself  to memory utilization  of 16 pages of  2^(n-4) registers
each  without reloading  (n -  number of  address bits  available from
CPU).

These  devices have  four modes  of operation:  read, write,  map, and
pass.  Data may be read from  or loaded into the map register selected
by  the register select  inputs (RS0  thru RS3)  under control  of R/W
whenever chip select (CS) is low. The data I/O takes place on the data
bus DO thru D7. The map  operation will output the contents of the map
register selected by the map address  inputs (MA0 thru MA3) when CS is
high and  MM (map mode control)  is low. The 'LS612  output stages are
transparent in this mode, while  the 'LS610 outputs may be transparent
or latched. When CS and MM are both high (pass mode), the address bits
on MA0 thru MA3 appear at M08-MO11, respectively (assuming appropriate
latch control) with  low levels in the other bit  positions on the map
outputs.
***Versions:...
***Features:...
**TACT82000   3-Chip 286 [no datasheet]                            c89...
**TACT82411   Snake  Single-Chip AT Controller                     c90...
**TACT82S411  Snake+ Single-Chip AT Controller [no datasheet]      c91...
**TACT83000   AT 'Tiger' Chip Set (386)                            c89...
**TACT84500   AT Chip Set (486, EISA) [no datasheet, some info]    c91...
**Other:...
*UMC...
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*Winbond...
*ZyMOS...
*General Sources:...

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