82C836 Datasheet, PDF (12/205 Pages) List of Unclassifed Manufacturers – Single-Chip 386sx AT

Section 1
82C836 CHIPSet Introduction
The 82C836 (also known as SCATsx) is a VLSI device incorporating the motherboard
logic required to build a low-cost, highly-integrated, IBM PC/AT-compatible computer.
It is designed to be used in conjunction with other Chips and Technologies controllers
such as the 82C45X VGA Controller and the 82C710 Integrated Floppy Disk and
Multifunction Controller. When used with these devices, the 82C836 acts as the heart
of a highly integrated system significantly reducing motherboard size, component count,
and the need for many I/O channel slots.
Featu res
The 82C836 provides the following features:
• 80386sx control logic and clocks to
support CPU speeds of up to 25MHz
with zero (or one) wait states
• A 146818-compatible Real Time Clock
with 114 bytes of CMOS RAM
• Two 8237-compatible DMA controllers
• Two 8259-compatible interrupt
controllers
• An 8254-compatible programmable
interval timer
• An 82284-compatible clock generation
and READY interface
• An 82288-compatible bus controller
• A DRAM refresh controller
• Power management features
• A DRAM controller that supports up to
16 MB of DRAM using 256kB, 1MB
or 4MB DRAMs
• A memory controller that provides
shadow RAM and support of either
8-bit or 16-bit BIOS ROM
• Support for fast local cache RAM via
external cache controller
• Four EMS page registers (LIM EMS
4.0 and 3.2 compatible)
• Interface logic for an 80387sx numeric
coprocessor
• Interface logic for an 8042 keyboard
controller
• Fast GATEA20 and fast CPU reset logic
• Compact packaging in a single 160-pin
plastic flat pack (160 PFP).
Chips and Technologies, Inc.
PRELIMINARY
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