P R E L I M I N A R Y | AMD |
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| VDDT, VDDU1, |
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| VDDU2, VDDP, |
| Acceptable |
VCC | VDDM | AVDD, VDD5 | Combination |
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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 | No |
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|
|
|
5 V | Any Combination | Both at 5 V | No |
| of 3 V and 5 V |
|
|
5 V | All at 5 V | Any | No |
|
| Combination |
|
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| of 3 V and 5 V |
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|
|
|
|
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
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
Am79C930 | 33 |
