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**82340SX Chip Set (VLSI) (82343/82344) 01/25/89
***Notes:...
***Info:
****82343 System Controller/Data Buffer:
The 82343 contains the system control and data buffering functions in
a 160-pin flatpack.
The 82343 functions are highly programmable via a set of internal
configuration registers. Defaults on reset for the configuration
registers mimic the compatibility requirements of the original IBM
PC/AT as closely as possible. The power up defaults allow any
possible configuration of the system to boot at the CPU's rated
speed. however, operational capabilities may be temporarily reduced
until the configuration registers are set to mirror the true system
configuration. This normally occurs during BIOS power-on self-test in
a manner completely transparent to the user.
The 82343 is designed to perform in systems running up to 20
MHz. Built-in page-mode operation, two- or four-way interleaving, and
fully programmable memory timing allow the PC designer to maximize
system performance using low cost DRAMs. Programmable memory timing
allows the system to be setup to perfectly match the requirements of
the chosen DRAMs; standard or custom. These adjustments can often be
made without incurring the penalty of additional wait states.
The system controller handles system board refresh directly and also
controls the timing if slot bus refresh which is actually performed by
the 82344 ISA Bus Controller. Refresh may be performed in coupled or
decoupled mode. The former method is the standard PC/AT-compatible
mode where on- and off-board refreshes are performed synchronously. In
decoupled mode, the timing of on- and off-board refreshes is
independent. Both may be programmed for independent, slower than
normal rates. This allows use of low power, slow refresh DRAMs. The
82343 controls all timing in both modes. In all cases, refreshes are
staggered to minimize power supply loading and attendant noise on the
VDD and ground pins. In sleep mode, refresh switches to CAS# before
RAS# refresh for maximum power savings.
The physical banks of DRAM can be logically reordered through one of
the indexed configuration registers. This DRAM remap option is useful
in order to map out bad DRAM banks allowing continued use of a system
until repairs are convenient. It also allows DRAM bank combinations
not in the supported memory maps to be logically moved into a
supported configuration without physically moving memory components,
This unique, programmable function performs this task by switching the
internal RAs# and CAS# signals between the external RAS# and CAS#
pins. This allows internal row and column addresses generated for DRAM
bank 0, for example, to be routed to any one of the four on-board DRAM
banks.
Full EEMS support is provided in hardware for the complete LIM EMS 4.0
standard. Seventy-two mapping registers provide a standard and an
alternate set of 36 registers each. The system allows backfill down to
256k for EEMS support and provides 24 mapping registers which cover
the EMS space from C0000h to E0000h. These twelve registers can
alternatively be mapped in the A0000-BFFFFh and D0000-DFFFFh range by
changing a configuration bit in the 82343. All registers are capable
of translating over the complete 32 Mbyte range of on-board
DRAM. Users preferring an alternate plug-in EMS solution, can disable
the on-board EMS system as well as system board DRAM, as required,
down to 256k.
Shadowing features are supported on all 16K boundaries between 640K
and 1M. Simultaneous EMS use, shadowed ROM, and direct system board
access is possible in non-overlapping fashion throughout this memory
space. Control over four access options is provided.
1. Access ROM or slot bus for reads and writes.
2. Access system board DRAM for reads and writes.
3. Access system board DRAM for reads and slot bus for writes.
4. Shadow setup mode. Read ROM or slot bus, write system board DRAM.
These controls are overridden by EMS in segments for which it is
enabled.
****82344 ISA Bus Controller:...
***Configurations:...
***Features:...
**82350 EISA Chip Set 07/10/89...
**82350DT EISA Chip Set 04/22/91...
**82420TX/ZX PCIset (for 486) TX (Saturn), ZX (Saturn II) c:Nov92...
**82420EX PCIset (for 486) EX (Aries) (82425EX/82426EX) <Dec94...
**82430LX PCIset (Pentium) LX (Mercury) (82433LX/82434LX) 03/22/93...
**82430NX PCIset (Pentium) NX (Neptune) (82433NX/82434NX) Mar94...
**82430FX PCIset (Pentium) FX (Triton I) (82437FX/82438FX)01/31/95...
**82430MX PCIset (Pentium) MX (Mobile Triton)(82437/438MX)11/01/95...
**82430HX PCIset (Pentium) HX (Triton II) (82439HX) 02/12/96...
**82430VX PCIset (Pentium) VX (Triton II) (82437VX/82438) 02/12/96...
**82430TX PCIset (Pentium) TX (Triton II) (82439TX) 02/17/97...
**82450KX/GX PCIset (Pentium Pro) KX/GX (Mars/Orion) 11/01/95...
**
**Support Chips:
**82091AA Advanced Interface Peripheral (AIP) c93...
**8289 Bus Arbiter (808x) c79...
**82289 Bus Arbiter for iAPX 286 Processor Family c83...
**82258 Advanced Direct Memory Access Coprocessor(ADMA) 01/01/84...
**82335 High-Integration Interface Device For 386SX c:Nov88...
**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:...
***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...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C481?/482? HiP/486 & HiB/486 [no datasheet] Oct89
***Notes:...
**82C491/392 486WB PC/AT Chipset <04/21/91...
**82C493/392 486SXWB <10/21/91...
**82C495SX/392SX LCWB PC/AT chipset [no datasheet] ?...
**82C495SLC DXSLC 386/486 Low Cost Write Back c:92...
**82C495XLC PC/AT Chip Set c:93...
**82c496A/B DXBB PC/AT Chipset <Mar92...
**82C496/7 DXBB PC/AT Chipset (Cached) <01/16/92...
**82C498 DXWB PC/AT chipset [no datasheet] ?...
**82C499 DXSC DX System Controller c:93...
**82C546/547 Python PTM3V c:94...
**82C556/7/8 Viper [no datasheet] ?...
**82C556/7/8N Viper-N Viper Notebook Chipset <05/25/95...
**82C556M/7M/8E Viper-N+ Viper Notebook Chipset c:96...
**82C566/7/8 Viper-Max Chipset Scalable MultiMedia PC Solution ?...
**82C571/572 486/Pentium c:93...
**82C576/7/8 Viper Xpress [no datasheet] ?...
**82C576/8/9 Viper XPress+ [no datasheet, some info] <01/16/97...
**82C596/597 PTMAWB Pentium Adaptive Write-back (Cobra) c:93...
**82C650/1/2 Discovery (Pentium Pro) [no datasheet] ?...
**82C681/2/6/7 386/486WB EISA c:92...
**82C683 386/486AWB EISA [no datasheet] ?...
**82C693/6/7 Pentium uP Write Back Cache EISA c:93...
**82C700 FireStar c:97...
**82C701 FireStar Plus c:97...
**82C750 Vendetta [no datasheet] ?...
**82c801 SCWB2 DX Single Chip Solution c:92...
**82C802 SCWB2 PC/AT Single Chip [no datasheet] ?...
**82C802G/GP System/Power Management Controller (cached) c:93...
**82C895 System/Power Management Controller (cached) c:Sep94...
**82C898 System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2 Buffer Devices <Nov94...
**82C822 PCIB (VLB-to-PCI bridge) c:94...
**Other:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...
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