AM79C974 datasheet(25/153 Pages) AMD

25 / 153 page

P R E L I M I N A R Y

AMD

Am79C974

Miscellaneous

RESERVED

Reserved_DO NOT CONNECT

Input

This pin (#116) is reserved for internal test logic. It

MUST NOT BE CONNECTED to anything for proper

chip operation. It’s use is subject to change in future

products.

Power Supply Pins

Analog Power Supply Pins

AVDD

Analog Power (4 Pins)

Power

There are four analog +5 V supply pins. Special atten-

tion should be paid to the printed circuit board layout to

avoid excessive noise on these lines.

Refer to

Appendix C and the

Technical Manual (PID #18738A)

for details.

AVSS

Analog Ground (2 Pins)

Power

There are two analog ground pins. Special attention

should be paid to the printed circuit board layout to avoid

excessive noise on these lines. Refer to Appendix C and

the

Technical Manual (PID #18738A) for details.

Digital Power Supply Pins

VDD/DVDD

Digital Power (5 Pins)

Power

There are 5 power supply pins that are used by the inter-

nal digital circuitry. All VDD pins must be connected to a

+5 V supply.

VDDB/VDDB

I/O Buffer Power (5 Pins)

Power

There are 5 power supply pins that are used by the PCI

bus Input/Output buffer drivers. All VDDB pins must be

connected to a +5 V supply.

VSS/DVSS

Digital Ground (9 Pins)

Ground

There are 9 ground pins that are used by the internal

digital circuitry.

VSSB/VSSBS

I/O Buffer Ground (11 Pins)

Ground

There are 11 ground pins that are used by the PCI bus

Input/Output buffer drivers.

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