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SYSTEM OVERVIEW
The
82380
Integrated System Peripheral
is
a multi-function Intel386 DX microprocessor
companion chip.
It
integrates a 32-bit DMA Controller with other necessary processor
support functions needed in an Intel386 DX microprocessor
environment. The 82380
is
optimized for use with the Intel386
DX
microprocessor.
It
enhances the overall Intel386
DX
microprocessor system performance
by
providing high data throughput
as
well
as
efficient bus operation. The 32-bit DMA Controller provides eight independently pro-
grammable channels that can transfer data at the full bandwidth of the Inte1386 DX
microprocessor bus.
Other features of the
82380
are listed
as
follows.
• High performance 32-bit DMA Controller
8 independently programmable channels
32
megabytes per second data transfer rate at
16
MHz
40
megabytes per second data transfer rate at
20
MHz
Capable of transferring data between devices with different bus widths
Automatic byte assembly/disassembly capability for non-aligned data transfers
Buffer chaining capability for transferring data into non-contiguous memory
buffers
• 20-Source Interrupt Controller
15
external, 5 internal interrupt requests
82C59A susperset
Individually programmable interrupt vectors
• Four 16-bit programmable Interval Timers
- 82C54 compatible
• Programmable Wait State Generator
-
0 to
15
wait states for memory and I/O access cycles
• DRAM Refresh Controller
- Refresh request
always
has the highest priority among the DMA requests
• Inte1386 DX microprocessor Shutdown Detect and Reset Control,
- Software and hardware reset
• Optimized for use with the
Inte1386
DX microprocessor
Resides on local bus for maximum bus bandwidth
1.4 CACHE CONTROLLER
A cache memory subsystem provides fast local storage for frequently accessed code and -
data. This results in faster memory access for the microprocessor· and reduces the
amount of traffic on the system bus.
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