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PCH SPI Flash Compatibility Requirement
3.1.7 Hardware Sequencing Requirements
The following table contains a list of commands and the associated opcodes that a SPI-
based serial flash device must support in order to be compatible with hardware
sequencing.
Commands OPCODE Notes
Write to Status
Register
01h Writes a byte to SPI flash’s status register. Enable Write
to Status Register command must be run prior to this
command
Program Data 02h Single byte or 64 byte write as determined by flash part
capabilities and software
Read Data 03h
Write Disable 04h
Read Status 05h Outputs contents of SPI flash’s status register
Write Enable 06h
Fast Read 0Bh
Enable Write to
Status Register
50h or 06h Enables a bit in the status register to allow an update to
the status register
Erase Programmable/
Discoverable
4 Kbyte erase. Uses the value from SFDP (if available)
else value from VSCCn Erase Opcode register value
Chip Erase C7h and/or 60
JEDEC ID 9Fh See Section 3.1.5 for more information
Dual Output Fast
Read
3Bh/
Discoverable
Discoverable opcodes are obtained from each
component’s SFDP table
Dual I/O Fast Read Discoverable Opcode is optained from each component’s SFDP table
Quad I/O Fast Read Discoverable Opcode is optained from each component’s SFDP table
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