Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

158

Order Number: 330061-002US

Not Supported

Reserved

00h

(Extended 

Command)

SetVID_Fast

01h

VID

n/a

Sets the new VID target. VR Jumps to the new VID 

target with controlled (up or down) slew rate 

programmed by the VR. When the VR receives a VID 

Moving Up command it exits all low-power states to 

the normal state to ensure the fastest slew to the 

new voltage. VR sets VR_settled bit and issues alert 

when VR has reached new VID target.

SetVID_Slow

02h

VID

n/a

Sets the VID target. VR Jumps to new VID target 

with controlled slew rate (up or down) programmed 

by the VR. SetVID-Slow is 4x slower than SetVID-

fast. When VR receives a VID Moving Up command it 

exits all low-power states to the normal state to 

ensure the fastest slew to the new voltage. VR sets 

VR_settled and issues alert when VR has reached 

new VID target.

SetVID_Decay

03h

VID

n/a

Sets the VID target. VR jumps to new VID target, but 

does not control the slew rate, the output voltage 

decays at a rate proportional to the load current. 

SetVID_Decay is only used in VID down direction. VR 

sets VR_settled bit is set, but alert line is not 

asserted for SetVID-decay.

SetPS

04h

Power State 

(PS)

n/a

Sends information based on the CPU power state to 

the VR controller so it configures the VR to improve 

efficiency, especially at light load.

SetRegADR

05h

VR Register 

Address

n/a

Sets the address pointer in the data register table. 

Typically the Next command SetRegDAT is the 

payload that gets loaded into this address. However, 

for multiple writes to the same address, only one 

SetRegADR is needed.

SetRegDAT

06h

VR Register 

Data

n/a

Writes the contents to the data register that was 

previously identified by the address pointer with 

SetRegADR.

GetReg

07h

VR Register 

Address

VR 

Register 

Data

Slave returns the specified register contents as the 

payload. The majority of the VR monitoring data is 

accessed through the GetReg command.

Test_Mode

08h

Vendor Defined

Reserved

08h 

through 

1Fh

Slave returns a Reject acknowledgment.