Altera MAX 10 FPGA Bedienungsanleitung PDF herunterladen (Seite 31)

MAX 10 FPGA Configuration Design Guidelines

2015.05.04

UG-M10CONFIG

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Dual-Purpose Configuration Pins

Guidelines: Dual-Purpose Configuration Pin

To use configuration pins as user I/O pins in user mode, you have to adhere to the following guidelines.

Table 3-1: Dual-Purpose Configuration Pin Guidelines for MAX 10 Devices

Pins Guidelines

nCONFIG During initialization:

• tri-state the external I/O driver and drive an external pull-up resistor

(6)

• use the external I/O driver to drive the pins to the state same as the external weak pull-

up resistor

nSTATUS

CONF_DONE

nSTATUS

Tri-state the external driver of the configuration pins before the t

WAIT

(minimum) wait

time is reached. You can use these pins for configuration purpose after t

WAIT

(maximum).

CONF_DONE

TDO

nCONFIG

You can only use the nCONFIG pin as a single-ended input pin in user mode.

If the nCONFIG is set as user I/O, you can trigger the reconfiguration by:

• asserting RU_nCONFIG of the remote system upgrade circuitry

• issuing PULSE_NCONFIG JTAG instruction

(6)

If you intend to remove the external weak pull-up resistor, Altera recommends that you remove it after

the device enters user mode.

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