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Intel C2550 FH8065401488912 Data Sheet

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FH8065401488912
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Volume 2—Serial Interrupt Controller—C2000 Product Family
Signal Descriptions
Intel
®
 Atom™ Processor C2000 Product Family for Microserver
Datasheet, Vol. 2 of 3
September 2014
492
Order Number: 330061-002US
23.1
Signal Descriptions
The signal description table has the following headings:
• Signal Name: The name of the signal/pin
• Direction: The buffer direction is either input, output, or I/O (bi-directional)
• Type: The buffer type
• Description: A brief explanation of the signal function
Note:
Only 3.3V LPC devices are supported on the LPC interface.
Table 23-2. SoC Serial Interrupt Interface Signals
Signal Name
Direction/
Type
Description
O
LPC Clock [1:0] Out: 
A 25-MHz PCI-like clock driven to the LPC 
I/OD
LPC Clock Run:
 Input to determine the status of the LPC clock and an 
open-drain output is used to request starting or speeding up of the LPC 
clock. This is a sustained tri-state signal used by the central resource to 
request permission to stop or slow the LPC clock. The central resource 
maintains the signal in the asserted state when the LPC clock is running 
and deasserts the signal to request permission to stop or slow the LPC 
clock.
An external pull-up resistor, 20 kΩ suggested, tied to 3.3V is required.
This signal is muxed with GPIOS[28] and is used by other functions.
I/O
Serial Interrupt Request: 
This signal implements the serialized