EP80579 Datasheet, PDF (161/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
6.0
Reset and Power Management
This chapter describes the Intel^® EP80579 Integrated Processor reset and power
management.
6.1
Reset and Powergood Distribution
This section discusses the detailed sequencing of how power and clocking signals must
be applied to bring the EP80579 out of reset.
6.1.1
Types of Reset
The EP80579 has four types of reset: Power-good (cold) reset, Hard reset, CPU-only
reset, and Targeted I/O subsystem reset(s). Each of these reset subclasses have
unique effects and is described in Table 6-1.
Table 6-1. Types of Reset and Wake-up from Power Saving States
Type
Mechanism
Power-good
Hard
Software (SW)
Controlled
CPU-only
S3 -> S0
S4/S5->S0
Input pin
Input pin
Write to I/O port CF9
Internal to the EP80579.
Generated by IMCH
Wake Event
Wake Event
Effect of Reset on following blocks
CPU
Reset
Reset
IMCH/
IICH
AIOC
Reset
Reset
Reset
Reset
PCI-E
DDR
Reset
Reset
Reset
Reset
Reset
Reset
Reset
Reset
Reset
Reset
Reset
Reset
-N/A
Reset
Reset
-N/A
Reset
Reset
-N/A
Reset
Reset
-N/A
-N/A
Reset
6.1.1.1
Powergood Implementation
The initial boot from when the power supplies are energized is facilitated by the
Powergood mechanism. The voltage sources from all platform power supplies are
routed to a system component which tracks them as they ramp-up, asserting platform
powergood (CPU_VRD_PWR_GD and SYS_PWR_OK) after a fixed interval (nominally 99
ms) after the last voltage reference has stabilized. Powergood signals are propagated
asynchronously to dedicated IICH, IMCH, and IA-32 core inputs. Generally, the devices
on AIOC fabric including the AIOC reset block do not receive a powergood signal. The
exception is the GbE MAC devices (see Section 6.1.2.3.5, “GbE MAC”).
Table 6-2 summarizes the power wells and external voltages required by the EP80579.
More detailed power supply pin information can be found in Table 6-3.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
161