LAN9250 datasheet(322/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 322

 2015 Microchip Technology Inc.

GPIO 1588 Timer Interrupt A Clear Enable

(GPIO_1588_TIMER_INT_A_CLEAR_EN)

This bit enables the selected GPIO to clear the 1588 Timer Interrupt A

(1588_TIMER_INT_A) bit of the 1588 Interrupt Status Register

(1588_INT_STS).

The GPIO input is selected using the GPIO 1588 Timer Interrupt A Clear

Select (GPIO_1588_TIMER_INT_A_CLEAR_SEL[2:0]) bits in this register.

The polarity of the GPIO input is determined by GPIO Interrupt/1588 Polarity

2-0 (GPIO_POL[2:0]) in the General Purpose I/O Configuration Register

(GPIO_CFG).

Note:

The GPIO must be configured as an input for this function to

operate. For the clear function, GPIO inputs are edge sensitive and

must be active for greater than 40 ns to be recognized.

R/W

10:8

GPIO 1588 Timer Interrupt A Clear Select

(GPIO_1588_TIMER_INT_A_CLEAR_SEL[2:0])

These bits determine which GPIO is used to clear the 1588_TIMER_INT_A

bit of the 1588 Interrupt Status Register (1588_INT_STS).

Note:

The IEEE 1588 Unit supports 3 GPIO signals.

R/W

000b

7:6

RESERVED

5:4

Clock Event Channel B Mode (CLOCK_EVENT_B)

These bits determine the output on Clock Event Channel B when a Clock Tar-

get compare event occurs.

00: 100ns pulse output

01: Toggle output

10: 1588_TIMER_INT_B bit value in 1588_INT_STS_EN register output

11: RESERVED

Note:

The General Purpose I/O Configuration Register (GPIO_CFG) is

used to enable the clock event onto the GPIO pins as well as to

set the polarity and output buffer type.

R/W

00b

3:2

Clock Event Channel A Mode (CLOCK_EVENT_A)

These bits determine the output on Clock Event Channel A when a Clock Tar-

get compare event occurs.

00: 100ns pulse output

01: Toggle output

10: 1588_TIMER_INT_A bit value in 1588_INT_STS_EN register output

11: RESERVED

Note:

The General Purpose I/O Configuration Register (GPIO_CFG) is

used to enable the clock event onto the GPIO pins as well as to

set the polarity and output buffer type.

R/W

00b

Bits

Description

Type

Default

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