AM79C930 datasheet(32/161 Pages) AMD

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AMD

P R E L I M I N A R Y

Am79C930

IEEE 1149.1 Test Access Port Pins

TCK

Test Clock

Input

TCK is the clock input for the boundary scan test mode

operation. TCK frequency may be as high as 10 MHz.

TCK does not have an internal pull-up resistor and must

be connected to a valid TTL or CMOS level at all times.

TCK must not be left unconnected.

TDI

Test Data Input

Input

TDI is the test data input path to the Am79C930 device.

If left unconnected, this pin has a default value of HIGH.

TDO

Test Data Output

Output

TDO is the test data output path from the Am79C930 de-

vice. TDO is tri-stated when the JTAG port is inactive.

TMS

Test Mode Select

Input

TMS is a serial input bit stream is used to define the spe-

cific boundary scan test to be executed. If left uncon-

nected, this pin has a default value of HIGH.

TRST

Test Reset

Input

When asserted,

TRST will asynchronously reset the

IEEE 1149.1 state. The reset state of the IEEE 1149.1

state machine is FFh.

Test Pin

TEST

Test

Input

The

TEST pin should be tied HIGH and is reserved for

internal factory test only.

Power Supply Pins

Analog Power Supply Pins

AVDD

Analog Power (1 Pin)

Power

There is one analog 5 V supply pin. This supply pin pro-

vides power to the analog section of the Am79C930 de-

vice. This pin must always be connected to 5 V, unless

the A/D function of the device is not required. If the A/D

function of the device is not required, then this pin may

be connected to either a 5 V supply or to a 3.3 V supply.

Note: A/D must be disabled. However, all analog power

pins (AVDD and VDD5) must be connected to the same

supply voltage. Special attention should be paid to the

printed circuit board layout to avoid excessive noise on

the AVDD line.

AVSS

Analog Ground (1 Pin)

Ground

There is one analog ground pin. This ground pin pro-

vides ground reference to the analog section of the

Am79C930 device. This pin must always be connected

to a ground supply. Special attention should be paid to

the printed circuit board layout to avoid excessive noise

on the AVSS line.

VDD5

A/D Power (1 Pins)

Power

There is one A/D power supply pin. This pin provides

power to the A to D converter circuit. This pin must

always be connected to a 5 V supply unless the A/D

function of the device is not required. If the A/D function

of the device is not required, then this pin may be con-

nected to either a 5 V supply or to a 3.3 V supply. How-

ever, all analog power pins (AVDD and VDD5) must be

connected to the same supply voltage. Special attention

should be paid to the printed circuit board layout to avoid

excessive noise on the VDD5 line.

Digital Power Supply Pins

VDDT

Transceiver Power (2 Pins)

Power

There are two transceiver interface power supply pins.

These pins provide power to the transceiver interface

buffers and drivers on pins 98 through 133. These pins

may be connected to either a 5.0 V supply or a 3.3 V sup-

ply, but both of these pins must be connected to the

same supply voltage.

VSST

Transceiver Ground (4 Pins)

Ground

There are four transceiver interface ground pins. These

pins provide ground reference to the transceiver

interface buffers and drivers on pins 98 through 133. In

both 5 V and 3 V systems, these pins should be con-

nected to a ground supply.

VCC

Core Logic Power (2 Pins)

Power

There are two core logic power supply pins. These pins

provide power to the core logic and must always be

less than or equal to VDDT, VDDU1, VDDU2, VDDP,

and VDDM.

AM79C930 Datasheet(PDF) 32 Page - Advanced Micro Devices

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