307013-003 Datasheet, PDF (247/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Functional Description
Note:
5.25.4
The following is a list of additional requirements specific to the ICH7 with Intel PRO
82573E configuration:
• Erase size capability of at least one of the following: 4 KBytes (preferred) or 256
bytes.
• Byte write must be supported.
• A serial flash device that requires the Write Enable command must automatically
clear the Write Enable Latch at the end of Data Program instructions
• Status Register bit 0 must be set to 1 when a write or erase is in progress and
cleared to 0 when a write or erase is not in progress.
• Minimum density of 4 Mb for non-BIOS data storage
• Minimum density of 8 Mb for shared flash configurations (4 Mb for non-BIOS data +
4 Mb for BIOS - platform dependant based on size of BIOS)
The ICH7 only supports Mode 0 on SPI flash devices.
Intel^® ICH7 Compatible Command Set
5.25.4.1
Required Command Set for Inter Operability
Table 5-62 contains a list of commands and the associated opcodes that a SPI based
serial flash device must support in order to be interoperable with the serial flash
interface.
Table 5-62. Required Commands and Opcodes
Commands OPCODE
Program Data
02h
Read Data
03h
Read Status
05h
5.25.4.2 Recommended Standard Commands
The following table contains a list of standard commands that a SPI device should
support to be compatible with the ICH7. This list only contains standard commands and
is not meant to be an all inclusive list of commands that SPI devices can support.
Table 5-63. Intel^® ICH7 Standard SPI Commands
Commands OPCODE
Notes
Write Status
Write Disable
Write Enable
Fast Read
JEDEC ID
Identify Device
01h
04h
06h
0Bh
9Fh
ABh
If command is supported by a device, 01h must be supported.
If command is supported by a device, 06h must be supported.
Intel^® ICH7 does not support this command.
Either JEDEC ID (9Fh) or an Identify Device with ABh is required,
not both.
Either JEDEC ID (9Fh) or an Identify Device with ABh is required,
not both
Intel ^® ICH7 Family Datasheet
247