Intel E3815 FH8065301567411 Data Sheet
Product codes
FH8065301567411
PCU – Serial Peripheral Interface (SPI)
Intel
®
Atom™ Processor E3800 Product Family
Datasheet
4377
31.2.7.2
Global Write Protection
The SPI controller has a Write Protection Disable (BCR.WPD) configuration bit. When
BCR.WPD=0b, BIOS is not able to perform any write or erase commands to the Flash.
When BCR.WPD=1b, protection against BIOS erase and rewrite is disabled. When the
lock enable (BCR.LE) bit is set, the BIOS can disable this protection only during System
Management Mode (SMM) execution.
BCR.WPD=0b, BIOS is not able to perform any write or erase commands to the Flash.
When BCR.WPD=1b, protection against BIOS erase and rewrite is disabled. When the
lock enable (BCR.LE) bit is set, the BIOS can disable this protection only during System
Management Mode (SMM) execution.
If BCR.LE=1b, the SPI controller confirms that only SMM code succeeds to set
BCR.WPD=1b. In addition, if BCS.SMIWPEN=1b, the SPI controller should initiate an
SMI when non SMM code tries to set BCR.WPD=1b.
BCR.WPD=1b. In addition, if BCS.SMIWPEN=1b, the SPI controller should initiate an
SMI when non SMM code tries to set BCR.WPD=1b.
31.2.8
SPI Flash Device Recommended Pinout
This table contains the recommended serial Flash device pin-out for an 8-pin device.
Use of the recommended pin-out on an 8-pin device reduces complexities involved with
designing the serial Flash device onto a motherboard and allows for support of a
common footprint usage model (refer to
Use of the recommended pin-out on an 8-pin device reduces complexities involved with
designing the serial Flash device onto a motherboard and allows for support of a
common footprint usage model (refer to
).
contains the recommended serial Flash device pin-out for a 16-
pin SOIC.
31.2.9
Serial Flash Device Package
Table 301. Recommended Pinout for 8-Pin Serial Flash Device
Pin #
Signal
1
Chips Select
2
Data Output
3
Write Protect
4
Ground
5
Data Input
6
Serial Clock
7
Hold / Reset
8
Supply Voltage
Table 302. Recommended Pinout for 16-Pin Serial Flash Device
Pin #
Signal
Pin #
Signal
1
Hold / Reset
9
Write Protect
2
Supply Voltage
10
Ground
3
No Connect
11
No Connect
4
No Connect
12
No Connect
5
No Connect
13
No Connect