VSC8540RT datasheet(59/87 Pages) MICROCHIP

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DS60001603E-page 59

VSC8540RT

6.5.2

GPIO CONTROL 2

The GPIO control 2 register configures the functionality of the COMA_MODE and LED pins.

6.5.3

FAST LINK CONFIGURATION

Register 19G in the GPIO register space controls the selection of the source PHY for the fast link failure indication. The

following table shows the settings available for the FASTLINK_FAIL pin.

6.5.4

RECOVERED CLOCK CONTROL

TABLE 6-50:

GPIO CONTROL 2, ADDRESS 14G (0X0E)

Bit

Name

Access

Description

Default

15:14

Reserved

Reserved.

COMA_MODE output enable

(active low)

R/W

1: COMA_MODE pin is an input.

0: COMA_MODE pin is an output.

COMA_MODE output data

R/W

Value to output on the COMA_MODE pin when it is

configured as an output.

COMA_MODE input data

Data read from the COMA_MODE pin.

Reserved

Reserved.

Tri-state enable for LEDs

R/W

1: Tri-state LED output signals instead of driving them

high. This allows the signals to be pulled above

VDDIO using an external pull-up resistor.

0: Drive LED bus output signals to high and low val-

ues.

8:0

Reserved

Reserved.

TABLE 6-51:

MAC CONFIGURATION AND FAST LINK REGISTER, ADDRESS 19G (0X13)

Bit

Name

Access

Description

Default

15:4

Reserved

Reserved.

3:0

Fast link failure setting

R/W

0000: Fast link failure pin enabled.

0001–1110: Reserved.

1111: Output disabled.

0000

TABLE 6-52:

RECOVERED CLOCK CONTROL, ADDRESS 23G (0X17)

Bit

Name

Access

Description

Default

Enable RCVRD_CLK

R/W

1: Enable recovered clock output.

0: Disable recovered clock output.

14:11

Reserved

Reserved.

10:8

Clock frequency

select

R/W

Select output clock frequency.

000: 25 MHz output clock.

001: 125 MHz output clock.

010: 31.25 MHz output clock.

011–111: Reserved.

000

7:6

Reserved

Reserved.

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