Intel 386 manual LAN Coprocessor, Clock Generator, 8086/80286 Family Components

SYSTEM OVERVIEW

•82308 Micro Channel Bus Controller

•82309 Address Bus Controller

•82706 VGA Graphics Controller

•82077 Floppy Disk Controller

The 82311 solution not only offers Micro Channel compatibility, but also high integra- tion and performance. It features all the peripheral functions required to interface to the CPU, Micro Channel Bus, I/O Peripheral Bus and the Graphics Channel.

The 82311 chip set supports the Inte1386 DX microprocessors up to 25 MHz, and the

. Inte1386 SX microprocessor.

1.7 LAN COPROCESSOR

The 82596DX is im intelligent high performance LAN coprocessor that performs high- level commands, command chaining, and interprocessor communications via shared memory. This relieves the host CPU of many tasks associated with network control; all time critical functions are performed independently of the CPU which greatly improves performance.

The high performance 82596DX bus interface combined with the high integration of the serial interface components (82C501AD or 82521TA), allows the integration of the LAN circuitry into the motherboard. This increases overall system performance while reduc- ing system complexity and manufacturing costs.

The 82596 product family comprises of 3 products:

•82596DX optimiZed for the Intel386 DX CPU

•82596SX optimized for the Intel386 SX CPU

•82596CA opt~mized for the Intel486 DX CPU

1.8CLOCK GENERATOR

The Clock Generator circuit (see Figure 3-16) generates timing for the Inte1386 DX microprocessor and its support components. The circuit provides both the Intel386 DX microprocessor clock (CLK2) and a half-frequency clock (CLK) to indicate the internal phase of the Inte1386 DX microprocessor and to drive 80286-compatible devices that may be included in the system. It can also be used to generate the RESET signal for the Intel386 DX microprocessor and other system components. Both CLK2 and CLK are used throughout this manual to describe execution times.

1.9 8086/80286 FAMILY COMPONENTS

With the appropriate interface, the Intel386 DX microprocessor can use 8086/80286 family components.

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