AMD-K6-2E Datasheet, PDF (282/332 Pages) Advanced Micro Devices – AMD-K6™-2E Embedded Processor

AMD-K6™-2E Processor Data Sheet
Preliminary Information
22529B/0—January 2000
Pin Connection
Requirements
For proper operation, the following requirements for signal pin
connections must be met:
s Do not drive address and data signals into large capacitive
loads at high frequencies. If necessary, use buffer chips to
drive large capacitive loads.
s Leave all NC (no-connect) pins unconnected.
s Unused inputs should always be connected to an
appropriate signal level.
• Active Low inputs that are not being used should be
connected to V_CC3 through a 20-kW pullup resistor.
• Active High inputs that are not being used should be
connected to GND through a pulldown resistor.
s Reserved signals can be treated in one of the following ways:
• As no-connect (NC) pins, in which case these pins are left
unconnected
• As pins connected to the system logic as defined by the
industry-standard Socket 7 and Super7 interfaces
• Any combination of NC and Socket 7 pins
s Keep trace lengths to a minimum.
14.7
I/O Buffer Characteristics
I/O Buffer Model
All of the AMD-K6-2E process or inputs , outputs, and
bidirectional buffers are implemented using a 3.3 V buffer
design. AMD has developed a model that represents the
characteristics of the actual I/O buffer to allow system
designers to perform analog simulations of AMD-K6-2E
processor signals that interface with the system logic. Analog
simulations are used to determine a signal’s time of flight from
source to destination and to ensure that the system’s signal
quality requirements are met. Signal quality measurements
include overshoot, undershoot, slope reversal, and ringing.
AMD provides a model of the AMD-K6-2E processor I/O buffer
for system designers to use in board-level simulations. This I/O
buffer model conforms to the I/O Buffer Information
Specification (IBIS). The I/O model contains voltage versus
current (V/I) and voltage versus time (V/T) data tables for
accurate modeling of I/O buffer behavior.
264
Electrical Data
Chapter 14