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
82521
TA), 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
1.8 CLOCK 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.
1-7