Flash Boot Compatibility Report

Flash Information

Part Number: S25FS512S

Type: NOR

Density: 512 Mb

Compatible Boot Modes

[OK] xSPI_1S1S1S

xSPI Boot - Legacy Mode (1S-1S-1S @ 50MHz)

B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

0 0 0 1 1 1 0 0 1 1

[OK] SPI

Standard SPI Boot (1S-1S-1S mode)

B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

0 0 0 0 0 1 1 0 1 1

Incompatible Boot Modes

[X] OSPI

Octal SPI Boot (1S-1S-8S mode)

- Boot mode OSPI (cmd 0x8B) not enabled

- Data width insufficient: requires 8-bit, flash supports 4-bit

[X] xSPI_8D8D8D_0x0B

xSPI Boot - High Speed Mode (8D-8D-8D @ 25MHz, cmd 0x0B)

- Boot mode xSPI_8D8D8D_0x0B (cmd 0x0B) not enabled

- Data width insufficient: requires 8-bit, flash supports 4-bit

- Flash with RESET pin operates in 3-byte address mode; 4-byte addressing commands not supported

[X] xSPI_8D8D8D_0xEE

xSPI Boot - High Speed Mode (8D-8D-8D @ 25MHz, cmd 0xEE)

- Boot mode xSPI_8D8D8D_0xEE (cmd 0xEE) not enabled

- Data width insufficient: requires 8-bit, flash supports 4-bit

- Flash with RESET pin operates in 3-byte address mode; 4-byte addressing commands not supported

[X] xSPI_SFDP

xSPI Boot with SFDP (OCTAL devices only, Auto-configured 8D-8D-8D)

- Data width insufficient: requires 8-bit, flash supports 4-bit

[X] QSPI

Quad SPI Boot (1S-1S-4S mode)

- Boot mode QSPI (cmd 0x6B) not enabled

[X] Serial_NAND_1bit

Serial NAND Boot (1S-1S-1S mode)

- Flash type mismatch: requires NAND, flash is NOR

[X] Serial_NAND_4bit

Serial NAND Boot (1S-1S-4S mode)

- Flash type mismatch: requires NAND, flash is NOR

[X] Serial_NAND_8bit

Serial NAND Boot (1S-1S-8S mode)

- Flash type mismatch: requires NAND, flash is NOR

Recommendations

RECOMMENDED: Use xSPI (1S-1S-1S @ 50MHz).

Recommended Bootmode Pin Configuration (xSPI_1S1S1S)

B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

0 0 0 1 1 1 0 0 1 1

B0-B2: 1 1 0 = 25 MHz Reference Clock
B3-B6: 0 1 1 1 = Boot Mode
B7-B9: 0 0 0 = Configuration

Note: Boot is always on CS0

Quick Reference Summary

Mode	Protocol	Command	Dummy	Frequency	Bootmode Pins (B9-B0)
xSPI_1S1S1S	1S-1S-1S	0x0B	8	50 MHz	0 0 0 1 1 1 0 0 1 1
SPI	1S-1S-1S	0x03	0	6.25 MHz	0 0 0 0 0 1 1 0 1 1

Total compatible modes: 2