Intel C2530 FH8065401488915 Ficha De Dados
Códigos do produto
FH8065401488915
Volume 2—Low Pin Count (LPC) Controller—C2000 Product Family
Architectural Overview
Intel
®
Atom™ Processor C2000 Product Family for Microserver
Datasheet, Vol. 2 of 3
September 2014
502
Order Number: 330061-002US
24.2
Architectural Overview
The LPC serves as a PCI-to-ISA bridge to a number of legacy ISA devices integrated in
the SoC and to the external LPC-1.1-compliant devices connected to the LPC interface
pins. The bridge is discovered by the software at bus 0, device 31 (decimal), function 0.
The SoC can boot the system BIOS and the system firmware through the LPC bus or
through the Serial Peripheral Interface (SPI). The software selects which of these two
BIOS/firmware boot sources to use. The BIOS Soft-Strap register (RCBA+00h[11:10])
must be set to 11b (default) to boot from SPI or 00b to boot from the LPC. This is
The LPC interface is used for connection of various legacy components.
24.2.1
No DMA or PHOLD Support
The SoC does not support bus-mastering devices on the LPC interface. Such devices
are bi-directional parallel ports, IR controllers, and floppy drive controllers. The LPC
does support DMA and what is known as PHOLD, the mechanism for an ISA device to
lock the system so that it performs DMA. Super I/O devices that depend on DMA are
not supported. If one of these devices is connected to the LPC and a PHOLD is
requested, the SoC drops the request, sets an error bit, and the system hangs
immediately.
This does not impact other legacy devices such as serial ports, keyboard/mouse, and
USB-based peripherals.