EP80579 Datasheet, PDF (785/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
21.0 Serial Peripheral Interface
21.1
21.1.1
21.2
Overview
The Serial Peripheral Interface (SPI) is a 4-pin interface that provides a potentially
lower-cost alternative for system flash versus the Firmware Hub interface that is
available on the LPC pins.
Features
• Support for Multiple SPI Flash Vendors
• Simple Hardware
• Equivalence to LPC-Based Firmware Hubs
— Provide the EP80579 Write Protection scheme
— Equivalent Performance (Boot time, Resume Time)
— Top Swap Functionality
— Support for E & F segments below 1 MB
— 64 Kb-Granular Protection
Note that the SPI does not provide support for very large BIOS sizes as easily as the
FWH interface. The EP80579 SPI interface is restricted to one Chip Select pin.
The Serial Peripheral Interface (SPI) is a 4-pin interface that provides a potentially
lower-cost alternative for system flash versus the Firmware Hub interface that is
available on the LPC pins.
External Interface
Table 21-1. SPI Pin Interface
Signal(s)
Width
Type
SPI_SCLK
SPI_CS#
SPI_MOSI
SPI_MISO
1
O
1
O
1
O
1
I
IO Type
LVTTL, 3.3V
LVTTL, 3.3V
LVTTL, 3.3V
LVTTL, 3.3V
Description
Serial bit-rate clock
17.86 MHz
CS for slave
Master data out / Slave In
Master data in/ Slave out
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
785