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**800 series
***810 (Whitney) 04/26/99...
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*Headland/G2...
*HMC (Hulon Microelectronics)...
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*OPTi...
**82C700 FireStar c:97
***Info:...
***Configurations:...
***Features:
PCI Bus
o PCI supports sustained X-1-1-1 bursts, even to DRAM through an
innovative mechanism. PCI operation can be concurrent with
CPU/L2 cache and IDE operations.
o PCI clock generation eliminates the need for external PCI clock
buffers in many designs and allows the PCI bus to be effectively
power-managed.
o 3.3V or 5.0V PCI is supported on the FireStar PCI bus. If FireStar
is configured for 3.3V operation, 5.0V-only PCI plug-in cards and
docking stations can still be supported through a bridge device
such as OPTi's 820824 Cardbus Controller/Docking Solution, whose
prefetch and post-write buffers off-load operations from the
primary PCI bus.
DRAM Controller
o Provides BIOS with the means to automatically detect the DRAM type
in use on each bank, whether fast page mode, EDO, or synchronous
DRAM, allowing BIOS routines to efficiently program DRAM
operation.
ISA Bus
o A full ISA bus is directly provided to support the keyboard
controller, BIOS ROM, and Compact ISA peripheral devices for local
ISA support with no TTL. When reduced ISA operation is selected,
other FireStar pins become available for general purpose use.
Bus Mastering IDE
o FireStar supports two bus mastering IDE channels that function
concurrently with operations on the CPU/L2 cache interface and PCI
interface. Up to four drives are supported.
o An emulated bus mastering IDE feature allows IDE drives that are
not commonly available as bus mastering devices, such as CD-ROM
drives, to act as bus mastering drives. For example, a CD-ROM
drive can transfer video data to DRAM while the CPU is
decompressing the data and sending it to the graphics controller.
Thermal Management
o Fail-safe thermal management incorporates feedback logic that
requires a very inexpensive external sensor circuit.
o Hardware monitors temperature directly and reliably, while the
fail-safe aspect of the circuitry ensures that sensor component
failure will automatically inhibit CPU clocking to prevent
overheating.
o SMM code will be able to read (and display if desired) actual CPU
temperature.
ACPI Implementation
o Microsoft Advanced Configuration and Power Interface (ACPI) is
being implemented in the FireStar silicon. ACPI is a standard
register interface for power management function jointly developed
by Microsoft, Intel, and Toshiba.
Miscellaneous
o The standard version of the chip can run at 3.3V, up to 66MHz on
the CPU bus.
o A new Context Save Mode feature allows chip registers to be saved
and restored more efficiently than ever before, requiring less SMM
code and storage space.
o The OPTi Viper-N+ Power Management Unit is used, maintaining
backward compatibility down to the register level with previously
written support firmware.
o Serial IRQs are supported as an option for interrupts on PCI.
o Known devices in the system can be positively decoded on the PCI
bus, eliminating the delay for subtractive decode and improving
the efficiency of ISA operations.
o ISA bus cycle speed can be individually controlled to certain ISA
device groups.
o Simple logic gate functions can be assigned to unused pins to
eliminate the need for external TTL. Pin programming is far more
flexible than ever possible on any other chip.
**82C701 FireStar Plus c:97
***Notes:...
***Info:
Overview
This section describes the follow-on chip to the OPTi FireStar ACPI
solution, the FireStar Plus. The key features of this new product can
be summarized as follows.
o Mostly backward-compatible in pin function and register set with
FireStar ACPI (some PIO functions have been moved from critical
pins to improve timing)
o Implements ATA-33 (Ultra DMA) IDE Interface, with support for all
modes
o Supports 2.5V CPUs
o Incorporates MA13 support for 64Mb SDRAM chips
o Incorporates 64Mb EDO DRAM support
o Enables use of synchronous DRAM on all six banks (original
FireStar chip limited synchronous DRAM to the first four banks)
o Allows redefinition of many interface pins for better utilization
of chipset PIO features (many new function pins are easily
available)
Features
The following paragraphs describe the feature set changes between
FireStar ACPI and FireStar Plus.
Ultra DMA IDE Interface
The ATA33 specification for synchronous bus mastering IDE, also known
as Ultra DMA, is fully supported by FireStar Plus.
Synchronous DRAM on All Banks
The original FireStar chip supports synchronous DRAM only on RAS0-3#.
FireStar Plus also supports synchronous DRAM on RAS4-5#. The
additional functionality is selected through register bits that are
already defined on the FireStar ACPI part.
2.5V CPU Interface
FireStar Plus supports newer CPUs with I/O voltage requirements as low
as 2.5V. The pin redefinition is as follows.
o Pins E8, G5, T5, and W5 are now VCC_CPU and can be powered at 2.5V
or 3.3V.
o Pins K5, H22, and AB19 are now VCC_CORE and must always be powered
at 3.3V.
o Pin M5, CPUCLKIN, must receive a clock on the VCC_CPU plane. So if
a 2.5V CPU is used, this clock should also be 2.5V.
The 2.5V interface is a strap-selected option. It is selected by a
strap on pin B7 (new MA13 pin). If B7 is sensed low at reset, the CPU
interface is 3.3V; if sensed high along with TMS (pin AB5) low, the
CPU interface is 2.5V.
Redefinition of DRQ/DACK# Interface
The 7 pins assigned to DACK0-7# can be redefined to improve avail-
ability of PIO pins.
While the new definition only involves circuit modifications to the
DACK0-7# pins, the overall gain is much greater when used with the
82C602A Companion Chip in its Viper Note-book Mode A configuration.
o 8 power management inputs are now available, muxed in with the
DRQs and IRQ8# on the four EPMMUX pins.
o 7 full-featured PIO pins are available on the former FireStar
DRQ0-7 pins and IRQ8# pin. The number of pins is actually 8, but
is reduced b y 1 because one must be programmed as ATCLK/2.
o 12 PPWR outputs are generated by latching the SD bus lines from
PCTLH (FireStar PPWRL) and PCTLL (FireStar RSTDRV).
o The ISA bus RSTDRV signal is now generated by the 82C602A chip, so
that the FireStar RSTDRV pin can be used for PPWR generation
(power control latch control signal). If the extra PPWR signals
are not needed, the FireStar RSTDRV pin becomes useful as a full-
featured PIO pin.
Warnings
1. Until the Extended Mode option has been programmed, DACK3-7# will
be driving out against the signal input muxes. It is therefore
important to ensure that the logic will not be harmed by this
arrangement (the FireStar outputs safely accept being driven by
external logic in this mode).
2. EDACKEN is an option used to ensure proper ISA master operation.
It prevents the EDACK decoder from glitching its DACK# outputs during
EDACK switching. If ISA masters are not supported in the system, this
option is not needed (tie the EDACK line high on the 82C602A).
3. There are no provisions to block conflicts in case more than one
pin is programmed to the same function. For example, if a PIO pin is
programmed to be ACPI8-11, and the Extended Mode option also enables
EPMMUX1 to bring in ACPI8-11, the results are unpredictable.
***Configurations:...
***Features:...
**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...
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