Cyclone® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 10/18/2023
Document Table of Contents

7.8.1. Controlling EPCS and EPCQ Devices

During configuration, Cyclone® V devices enable the EPCS or EPCQ device by driving its nCSO output pin low, which connects to the chip select (nCS) pin of the EPCS or EPCQ device. Cyclone® V devices use the DCLK and ASDO pins to send operation commands and read address signals to the EPCS or EPCQ device. The EPCS or EPCQ device provides data on its serial data output (DATA[]) pin, which connects to the AS_DATA[] input of the Cyclone® V devices.

Note: If you wish to gain control of the EPCS pins, hold the nCONFIG pin low and pull the nCE pin high. This causes the device to reset and tri-state the AS configuration pins.