ADIN1300BCPZ-R7 datasheet(25/79 Pages) AD

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Data Sheet

ADIN1300

Rev. 0 | Page 25 of 79

HARDWARE CONFIGURATION PINS

The ADIN1300 can operate in unmanaged or managed

applications. In unmanaged applications, the desired operation

of the PHY is configured from hardware configuration pins

without any software intervention. For unmanaged applications,

do not configure the PHY to enter software power-down after

reset to ensure that the PHY immediately attempts to bring up

links as configured by the PHY_CFG1 and PHY_CFG0 hardware

configuration pins after power is applied to the device.

In managed applications, software is available to configure the

PHY via the management interface (MDIO/MDC). In this case,

it is possible to configure the PHY to enter software power-down

mode after reset, such that the PHY can be configured before

linking is attempted.

Hardware configuration pins are pins shared with functional pins

and the voltage level on the pin is sensed and latched upon

exiting from a reset. Some hardware configuration pins are

multilevel sense, while others are two-level sense. Using two

resistors, R_LO and R_HI (see Figure 27), four different voltage

levels can be sensed, as shown in Table 19. Only MODE_1 (L)

and MODE_4 (H) are relevant to the two-level sense pins and

these are implemented with a 10 kΩ pull-down resistor or a

10 kΩ pull-up resistor, respectively. Note that LED_0 must be

pulled up to the AVDD_3P3 rail rather than VDDIO.

R_LO

R_HI

VDDIO1

1AVDD_3P3 FOR LED_0

Figure 27. Hardware Configuration Pin Implementation

Note that the values listed in Table 19 assume no extra loading

from circuitry external to the ADIN1300. It is likely that some

configuration pins can be connected to a field-programmable

gate array (FPGA) input that can have its own internal pull-

up/pull-down resistor. This loads the resistor divider voltage.

Assuming a pull-up resistor >43 kΩ and a pull-down resistor

>37 kΩ, replace the 10 kΩ resistor used in MODE_1 and

MODE_4 with a 2.5 kΩ resistor.

Table 19. Configuration Modes

Mode

R_LO

R_HI

Voltage Threshold

MODE_1

10 kΩ

Open

MODE_2

10 kΩ

56 kΩ

>0.1 × VDDIO1

MODE_3

56 kΩ

10 kΩ

>0.5 × VDDIO1

MODE_4

Open

10 kΩ

>0.9 × VDDIO1

Note that the supply rail for the LED_0 pin is AVDD_3P3 rather than VDDIO.

Therefore, pull up any pull-up on the LED_0 pin to AVDD_3P3.

Table 19 shows recommended resistor values for the multistrap

pins with the corresponding voltage threshold range required

for each mode. Table 20 shows the voltage ranges involved for

each mode vs. VDDIO voltage. The voltage levels shown were

chosen to steer clear of standard VIH/VIL voltage levels to avoid

any shoot-through currents (and unknown voltage levels) in the

input driver of disabled devices connected to the pins. VIH/VIL

voltage levels do have voltage and device dependencies. Therefore,

it may not always be possible to avoid such artifacts.

Table 20. Voltage Levels for Modes vs. VDDIO Voltage

VDDIO1

Mode

1.8 V

(V)

2.5 V

(V)

3.3 V (LED_0 = 3.3 V)

(V)

MODE_1

<0.18

<0.25

<0.33

MODE_2

>0.18

>0.25

>0.33

MODE_3

>0.9

>1.25

>1.65

MODE_4

>1.62

>2.25

>2.97

Note that the supply rail for the LED_0 pin is AVDD_3P3 rather than VDDIO.

Therefore, pull up any pull-up on the LED_0 pin to AVDD_3P3.

The large resistor values recommended in Table 19 were chosen

to minimize power consumption from the resistor ladder.

Smaller value resistors can also be used, but the user must

maintain the same resistor ratios for the values used.

HARDWARE CONFIGURATION PIN FUNCTIONS

The following functions are configurable from the ADIN1300

hardware pins (see Table 21 for pin details):

•

PHY address

•

Forced/advertised PHY speed

•

Software power-down mode after reset

•

Downspeed enable

•

Energy detect power-down mode

•

EEE enable

•

Auto MDIX

•

MAC interface selection (RGMII/RMII/MII)

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