AM79C930 datasheet(33/161 Pages) AMD

33 / 161 page

P R E L I M I N A R Y

AMD

Am79C930

VDDT, VDDU1,

VDDU2, VDDP,

Acceptable

VCC

VDDM

AVDD, VDD5

Combination

5 V

All at 5 V

Both at 5 V

Yes

3 V

All at 5 V

Both at 5 V

Yes

3 V

Any Combination

Both at 5 V

Yes

of 3 V and 5 V

3 V

All at 3 V

Both at 5 V

Yes

5 V

All at 3 V

Both at 5 V

5 V

Any Combination

Both at 5 V

of 3 V and 5 V

5 V

All at 5 V

Any

Combination

of 3 V and 5 V

Also, AVDD and VDD5 must be tied to 5 V, if A/D func-

tion is required. VDDT, VDDU1, VDDU2, VDDP, and

VDDM do not have to have the same voltage. If VCC =

3 V, any combination of 5 V or 3 V for VDDXX will work.

VSS

Core Logic Ground (2 Pins)

Ground

There are two core logic ground pins. These pins

provide ground reference to the core logic. In both 5 V

and 3 V systems, these pins should be connected to a

ground supply.

VDDU1

User Pin Power (1 Pin)

Power

There is one VDDU1 power supply pin. This pin pro-

vides power to the buffers and drivers on pins 84

through 96. This pin may be connected to either a 5 V

supply or to a 3.3 V supply.

VSSU1

Core Logic Ground (1 Pin)

Ground

There is one VSSU1 ground pin. This pin provides

ground reference to the buffers and drivers on pins 84

through 96. In both 5 V and 3 V systems, this pin should

be connected to a ground supply.

VDDU2

User Pin Power (1 Pin)

Power

There is one VDDU2 power supply pin. This pin pro-

vides power to the buffers and drivers on pins 1 through

3 and pins 139 through 144. This pin may be connected

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

VDDP

PCMCIA Power (1 Pin)

Power

There is one PCMCIA power supply pin. This pin pro-

vides power to PCMCIA and Power Management Crys-

tal buffers and drivers on pins 4l through 83. This

pin may be connected to either a 5 V supply or to a

3.3 V supply.

VSSP

PCMCIA Ground (2 Pins)

Ground

There are two PCMCIA ground pins. These pins provide

ground reference to the PCMCIA and Power Manage-

ment Crystal buffers and drivers on pins 41 through 83.

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

nected to a ground supply.

VDDM

Memory Interface Power (3 Pins)

Power

There are three Memory Interface power supply pins.

These pins provide power to the Memory Interface buff-

ers and drivers on pins 4 through 40. These pins may be

connected to either a 5.0 V supply or to a 3.3 V supply,

but all three of these pins must be connected to the

same supply voltage.

VSSM

Memory Interface Ground (3 Pins)

Ground

There are three Memory Interface ground pins. These

pins provide ground reference to the Memory Interface

buffers and drivers on pins 4 through 40. In both 5 V and

3 V systems, these pins should be connected to a

ground supply.

Multi-Function Pins

The Am79C930 device includes a number of pins which

have multiply-defined functions. The various functions

assigned to each of these pins is determined through

both device pin settings and through individual register

bit settings. This section explains the functional modes

of each of the multi-function pins and gives tables that

indicate the proper programming for each pin.

Pins in this section are listed by pin number.

Where the PCMCIA pin is not listed in a table, it can be

inferred that the setting of the PCMCIA pin has no influ-

ence on the pin values.

Under the column where pin directions are given in the

table, I = Input (high impedance), O = Output (totem

pole), OD = Open Drain.

Under the column where pin data is given in the table,

when the pin direction is given as Output, then the

pin data column indicates the source for the pin’s

output value.

Under the column where pin data is given in the table,

when the pin direction is given as Input, then the pin data

column will indicate NA, since the source for the pin

value is external. Note that when any pin is configured

for an input function, the pin value is almost always

available at the pin data register. A note following each

table indicates the availability of the pin data with re-

spect to the pin data register bit.

Note that in almost all cases, the pin data register bit will

always read the pin value, even if the pin is configured

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