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**CS8281 NEATsx (386SX) (82C811/812/215/206) c:Dec89
***Info:
The CS8281 NEATsx CHlPSet, which is composed of four VLSI devices, is
a high-performance, 100%-compatible enhanced implementation of the
control logic used in the IBM PC AT. The flexible architecture of the
NEATsx CHIPSet allows it to be used as the basis for any
386sx-compatible system.
The CS8281 NEATsx CHIPSet provides a complete 386sx PC/AT compatible
system, requiring only 24 logic components plus memory devices.
The CS8281 NEATsx CHIPSet consists of the 82C811 CPU/bus controller,
the 82C812 page/interleave and EMS memory controller, the 82C215
data/address buffer, and the 82C206 integrated peripherals controller
(IPC).
The NEATsx CHIPSet supports a local CPU bus, a 16-bit system memory
bus, and the AT buses as shown in the NEATsx system block diagram [see
datasheet]. The 82C811 provides synchronization and control signals
for all buses. The 82C811 also provides an independent AT bus clock
and allows for dynamic selection between the processor clock and a
user~selectable AT bus clock. Because command delays and wait states
are configured by software, peripheral boards are provided with
maximum flexibility.
The 82C812 page/interleave and EMS memory controller provides an
interleaved memory subsystem design with page mode operation. It sup-
ports up to 8MB of DRAM with combinations of 256Kb and 1Mb DRAMs. The
processor can operate at 16 MHz with 0.7 wait state memory accesses,
using 100 nsec DRAMs. This is possible through a page interleaved
memory scheme. A RAM shadowing feature allows faster execution of
EPROM stored BIOS code by downloading and executing code from RAM. in
a DOS environment memory above 1MB can be used as EMS memory.
The 82C215 data/address buffer provides buffering and latching between
the local CPU address bus and the peripheral address bus. It also
provides buffering between the local CPU data bus and the memory data
bus. Parity bit generation and error detection logic resides in the
82C215.
The 82C206 integrated peripherals controller is an integral part of
the NEATsx CHIPSet. It is described in the 82C206 data book.
System Overview
The CS8281 NEATsx CHIPSet is designed for use in 12-16 MHz 80386 based
systems and provides complete support for the IBM PC AT bus. Four
buses are supported by the CS8281 NEATsx CHIPSet: the CPU local bus (A
and D); the system memory bus (MA and MD); the I/O channel bus (SA and
SD); and the X bus (XA and XD). The system memory bus provides an
interface between the CPU and the DRAMs and EPROMS controlled by the
82C812. The I/O channel bus refers to the bus supporting the
AT-compatible bus adapters which can be either 8- or 16-bit devices.
The X bus is the peripheral bus to which the 82C206 IPC and other
peripherals are attached in an IBM PC AT.
***Configurations:...
***Features:...
**CS8283 LeAPset-sx (82C841/82C242/82C636) c:Mar90...
**CS8285 PEAKsx (82C836/82C835) c91...
**CS8288 CHIPSlite-sx (82C836/82C641/82C835) c?...
**CS4000 WinCHIPS (64200/84021/84025) c92...
**CS4021 ISA/486 (84021/84025) c92...
**CS4031 CHIPSet (84031/84035) 5/10/93...
**CS4041/5 CHIPSet (84041/84045) 2/10/95...
**CB8291 ELEAT [no datasheet] c90...
**CB8295 ELEATsx [no datasheet] c90...
**82C100 IBM PS/2 Model 30/Super XT ?...
**82C110 IBM PS/2 Model 30/Super XT ?...
**82C235 Single Chip AT (SCAT) c89...
**82C836 Single Chip 386sx (SCATsx) <91...
**F8680/A PC/CHIP Single-Chip PC c93...
**
**Support Chips:
**64200 (Wingine) High Performance 'Windows Engine' c:Oct91...
**82C206 Integrated Peripheral Controller c86...
**82C601/A Single Chip Peripheral Controller <08/30/90
***Notes:...
***Info:
The 82C601 single chip peripheral controllers is the second generation
of our Multifunction Controller product line.
This chip is an LSI implementation of the most commonly used
peripheral devices found in an IBM PC, XT or AT. The chip features 16
mA drivers for the output buffers, such as the host data bus and
parallel port data bus. It incorporates two 16450 compatible UARTs,
one enhanced parallel port (with bi-directional capability), and IDE
compatible hard disk interface and various chip selects (in the
MOTHERBOARD Application) or select pins and Game port decodes (in the
ADAPTER Application). Decoding logic and support for main, auxiliary
and standby power supplies and software configurable base addresses
for these devices, operational modes and interrupts are also
included. This chip supports 2 applications:
MOTHERBOARD Application where all the ports are relocatable. An
Integrated Drive electronics Interface, and various Chip Selects
(Floppy Disk, Real Time Clock and a General Purpose) have been added
for this mode. Power management aspects of the 82C601 in the
MOTHERBOARD Application include modular power down through PWRGD
pin. When the chip is powered down (i.e. when PWRGD is inactive) the
current draw should be less than 50 micro-Amps, all the inputs are
disabled, and all outputs are tri-stated. the contents of all the
registers are preserved, as long as power supply to the 82C601 is
maintained.
ADAPTER Application where the base address for the ports are
determined by the select pins (PSPz, SSPs, ASPs, and PPS); except for
game port, it is fixed @ 200H- 207H. -GAMERD and -GAMEWR outputs are
provided to minimize external gate count.
The host interface is PC compatible, i.e. DO-D7, A0-A9, -IOR, -IOW,
AEN, INTR1, INTR2, INTR3, INTR4, and RESET, and can be connected
directly to the bus. The data buffers (DO-D7, PD0-PD7, IDED7) are
capable of sinking 16 mA @ 0.5v, the parallel port control signals are
open collector with internal pull up resistors; and are capable of
sinking 16 mA @ 0.5V.
The UARTs implement fully functional serial links. Programmable
character length, parity generation and detection, stop-bit generation
and baud rate generation are provided. Double buffering is used so
that precise synchronization is unnecessary. Status information is
accessible to the CPU by reading internal registers. MODEM control
lines are provided, as are internal diagnostic functionality and
interrupt prioritization. Support for an auxiliary power system (such
as that derived from a telephone line or RS232 link) permits an 82C601
in a battery-powered device to consume no battery power until an
incoming character is detected.
The parallel port can be configured for output only (printer
application) or input and output (bi-direction}.
The configuration RAM and circuitry support programmable base
addresses for all registers internal to the chip. This permits
creation of a menu-driven program for system configuration. Selection
of sources for interrupts; enabling and configuring of on-chip
subsystems (UARTS. parallel port. etc.) and control of the
configuration process itself are also handled with this RAM and its
associated circuitry. The remainder of this data sheet will consider
each of the aforesaid subsystems individually. Sections containing
more general design data for the chip as a whole are at the end along
with electrical and physical characteristics.
***Versions:...
***Features:...
**82C607 Multifunction Controller <Jun88...
**82C710 Universal Peripheral Controller c:Aug90...
**82C711 Universal Peripheral Controller II c:Jan91...
**82C712 Universal Peripheral Controller II c:Jan91...
**82C721 Universal Peripheral Controller III c:May93...
**82C735 I/O Peripheral Controller With Printgine c:Jul93...
**82C835 Single CHIP 386sx AT Cache Controller c:Apr91...
**F87000 Multi-Mode Peripheral Chip 11/23/93...
**Other:...
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*Contaq . . . . . [no datasheets, some info]...
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*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82395SX Smart Cache 12/17/90
***Notes:...
**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...
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