Judgment of w25q512 - Githubissues

nopnop2002 commented 4 years ago

Hello.

W25qxx_ReadID() issues a 0x9f command to read the JEDEC ID.

The judgment of w25q512 is based on JEDEC ID.

        case 0x401A:    //  w25q512
            w25qxx.ID=W25Q512;
            w25qxx.BlockCount=1024;
            #if (_W25QXX_DEBUG==1)
            printf("w25qxx Chip: w25q512\r\n");
            #endif
        break;

There is W25Q512JV datasheet. https://www.winbond.com/resource-files/W25Q512JV%20SPI%20RevB%2006252019%20KMS.pdf

In page24, JEDEC ID of W25Q512JV is 4020h.

Is this a datasheet mistake?

Is it not necessary to issue B7H (Enter 4-byte address mode) for W25Q256 and W25Q512?

W25Q512 datasheet description:

Upon power up, the W25Q512JV can operate in either 3-Byte Address Mode or 4-Byte Address Mode, depending on the Non-Volatile Status Register Bit ADP (S17) setting. 
If ADP=0, the device will operate in 3-Byte Address Mode; if ADP=1, the device will operate in 4-Byte Address Mode. 
The factory default value for ADP is 0. 
To switch between the 3-Byte or 4-Byte Address Modes, “Enter 4-Byte Mode (B7h)” or “Exit 4-Byte Mode (E9h)” instructions must be used. 
The current address mode is indicated by the Status Register Bit ADS (S16).