Quad-Serial Configuration (EPCQ) Devices Datasheet

ID 683078
Date 1/23/2020
Document Table of Contents

1.5.2. Addressing Mode

The 3-byte addressing mode is enabled by default. To access the EPCQ256 or EPCQ512/A memory, you must use the 4-byte addressing mode. In 4-byte addressing mode, the address width is 32-bit address. To enable the 4-byte addressing mode, you must execute the 4BYTEADDREN operation. This addressing mode takes effect immediately after you execute the 4BYTEADDREN operation and remains active in the subsequent power-ups. To disable the 4-byte addressing mode, you must execute the 4BYTEADDREX operation.

Note: If you are using the Intel® Quartus® Prime software or the SRunner software to program the EPCQ256 or EPCQ512/A device, you do not need to execute the 4BYTEADDREN operation. The Intel® Quartus® Prime software enables the 4-byte addressing mode when programming the device automatically.