CS5530A datasheet(233/259 Pages) AMD

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AMD Geode™ CS5530A Companion Device Data Book

233

Electrical Specifications

Revision 1.1

6.0Electrical Specifications

This section provides information on electrical connections,

absolute maximum ratings, recommended operating condi-

tions, and DC/AC characteristics for the Geode CS5530A.

All voltage values in the electrical specifications are with

respect to VSS unless otherwise noted.

For detailed information on the PCI bus electrical specifica-

tion refer to Chapter 4 of the PCI Bus Specification, Revi-

sion 2.1.

6.1

Electrical Connections

6.1.1

Pull-Up Resistors

Table 6-1 lists the pins that are internally connected to a

20-kohm pull-up resistor. When unused, these inputs do

not require connection to an external pull-up resistor.

6.1.2

Unused Input Pins

All inputs not used by the system designer and not listed in

Table 6-1 should be kept at either VSS or VDD. To prevent

possible spurious operation, connect active-high inputs to

ground through a 20-kohm (±10%) pull-down resistor and

active-low inputs to VDD through a 20-kohm (±10%) pull-up

resistor.

6.1.3

NC-Designated Pins

Pins designated NC should be left disconnected. Connect-

ing an NC pin to a pull-up resistor, pull-down resistor, or an

active signal could cause unexpected results and possible

circuit malfunctions.

6.1.4

PWR/GND Connections and Decoupling

Testing and operating the CS5530A requires the use of

standard high frequency techniques to reduce parasitic

effects. These effects can be minimized by filtering the DC

power leads with low-inductance decoupling capacitors,

using low-impedance wiring, and by using all of the VDD

and VSS pins.

Table 6-1. Pins with Weak Internal Pull-Up

Signal Name

Type

Pin No.

IOR#

I/O

AE12

IOW#

I/O

AC11

MEMR#

I/O

AE19

MEMW#

I/O

AF20

SBHE#

I/O

AE17

SA[19:0]/

SD[19:0]

I/O

AD10, AE11, AF12, AD11,

AE25, AD24, AD22, AE21,

AF21, AC20, AD19, AF19,

AF4, AF5, AD5, AF6, AC6,

AD9, AE6, AD9

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