LAN7431 datasheet(47/77 Pages) MICROCHIP

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 2018-2019 Microchip Technology Inc.

DS00002631D-page 47

LAN7430/LAN7431

6.16

Miscellaneous

6.16.1

GENERAL PURPOSE INPUTS/OUTPUTS (GPIOS)

The GPIO controller is comprised of 4 (for the LAN7430) or 12 (for the LAN7431) programmable input / output pins

(GPIO[11:0]). These pins are individually configurable via the GPIO configuration registers. Push/pull and open-drain

output buffers are supported for each GPIO. When a GPIO pin is set to an output, the input buffer and pull-up are dis-

abled. When a GPIO pin is set as an input, the pull-up is enabled. Each GPIO has the ability to be used as a 1588 input

or output.

6.16.2

GENERAL PURPOSE TIMER (GPT)

The device includes a programmable general purpose timer that can be used to generate periodic system interrupts.

The resolution of this timer is 100uS. The GPT is loaded and enabled via the General Purpose Timer Configuration Reg-

ister. Once the enabled general purpose timer counts down to zero, the general purpose timer interrupt is asserted to

alert the user.

TABLE 6-3:

IEEE 1149.1 OP CODES

Instruction

Op Code

Comment

BYPASS 0

28’h0000000

Mandatory Instruction

BYPASS 1

28’hFFFFFFF

Mandatory Instruction

SAMPLE / PRELOAD

28’hFFFFFF8

Mandatory Instruction

EXTEST

28’hFFFFFE8

Mandatory Instruction

CLAMP

28’hFFFFFEF

Optional Instruction

ID_CODE

28’hFFFFFFE

Optional Instruction

HIGHZ

28’hFFFFFCF

Optional Instruction

TABLE 6-4:

JTAG ID

Device

JTAG ID

LAN7430

001E1445h

LAN7431

001F1445h

Note:

Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on internal resistors to drive

signals external to the device. When connected to a load that must be pulled high, an external resistor must

be added.

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