Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

448

Order Number: 330061-002US

There are numerous sources that can cause the SoC to reset the platform. There are 

also numerous types of resets that can result. 

 and the reset type list that 

follows describe these sources and the SoC reaction. See 

 for the SoC hardware-signal interface for power, resets, and 

state transitions.

Write of 0Eh to CF9h Register

A write of 0Eh to the CF9h register

2

Write of 06h to CF9h Register

A write of 06h to the CF9h register

1

PMU_RESETBUTTON_B and CF9h 

Bit 3 = 0

The user presses the reset button causing the 

CPU_RESET_B pin to go active (after the 

debounce logic).

1

PMU_RESETBUTTON_B and CF9h 

Bit 3 = 1

The user presses the reset button causing the 

CPU_RESET_B pin to go active (after the 

debounce logic).

2

TCO Watchdog Timer

The TCO timer reaches zero two times.

1

Power Failure

The COREPWROK signal goes inactive in S0.

4

S5

The SoC is reset when going into the S5 state.

3

SoC

 

Internal Thermal Trip

The internal thermal sensor signals a 

catastrophic temperature condition— transition 

to S5 and reset asserts.

5

PMU_PWRBTN_B (Power Button 

Override)

A 4-second press causes a transition to S5 (and 

reset asserts).

5

CPU Shutdown with Policy to Assert 

PMU_PLTRST_B

A shutdown special cycle from the CPU can 

cause either INIT or CF9h-style PLTRST.

4; if the CF9h Global Reset Bit = 1b, else

2; if the CF9h Register Bit 3 = 1b, else 1

Write of 06h or 0Eh to CF9h 

Register

CF9h Global Reset Bit = 1b

4

Host Partition Reset Entry Timeout

The host partition reset entry sequence took 

longer than the allowed time out value 

(presumably due to a failure to receive one of 

the internal or external handshakes). 

4

S5 Entry Timeout

An S5 entry sequence took longer than the 

allowed time out value (presumably due to a 

failure to receive one of the internal or external 

handshakes).

5

PMC Watchdog Timer

A firmware hang watchdog time out is detected 

in the PMC platform.

5