Intel C2550 FH8065401488912 Data Sheet
Product codes
FH8065401488912
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
481
Volume 2—Serial Peripheral Interface (SPI)—C2000 Product Family
Serial Flash Device Compatibility Requirements
22.7
Serial Flash Device Compatibility Requirements
A variety of Serial Flash devices exist in the market. For a Serial Flash device to be
compatible with the SPI bus, it must meet the minimum requirements detailed in the
following sections of this document.
22.7.1
BIOS SPI Flash Requirements
The SPI Flash device must meet the following minimum requirements when used
explicitly for the system BIOS storage:
• The erase size has at least one of the following: 64 Kbytes, 8 Kbytes, 4 Kbytes, or
256 bytes.
• The device must support multiple writes to a page without requiring a preceding
).
• The Serial Flash device must ignore the upper address bits such that an address of
FF_FFFFh aliases to the top of the Flash memory.
• SPI Compatible Mode 0 support (the clock phase is 0 and data is latched on the
rising edge of the clock).
• If the device receives a command that is not supported or incomplete (less than 8
bits), the device must complete the cycle gracefully without any impact on the
Flash content.
• An Erase command (page, sector, block, chip, etc.) must set all bits inside the
designated area (page, sector, block, chip, etc.) to 1 (Fh).
• Status register bit 0 must be set to 1 when a write, erase, or write to a status
register is in progress and cleared to 0 when a write or erase is NOT in progress.
• Devices requiring the Write Enable command must automatically clear the write
enable latch at the end of data program instructions.
• Byte write must be supported. The flexibility to perform a write between 1 byte to
64 bytes is recommended.
• Hardware sequencing requirements are optional in the BIOS-only platforms.
• SPI Flash devices that do not meet the hardware sequencing command set
• SPI Flash devices that do not meet the hardware sequencing command set
requirements may work in the BIOS-only platforms using software sequencing.