Intel C2350 FH8065401488914 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

294

Order Number: 330061-002US

With reference to 

 the ARP slave operates as follows (steps which are shaded 

are the responsibility of the firmware alone or of the firmware to trigger the hardware).

0. . . Perform ARP slave initialization.

• [FW

1

1.

After exiting the power-on-reset state, a device that supports PSA goes 

to step 2 to verify if its slave address is valid. If the device does not 

support PSA, it proceeds to step 5.

• [FW] SoC does not support PSA; jump 

past PSA-related steps to step 5

2.

A device supporting PSA must check its Address Valid flag which is non-

volatile. If that flag is set then it has previously received an assigned 

slave address; proceed to step 4. If the Address Valid flag is cleared 

then it must proceed to step 3.

• N/A

3.

Although the device supports PSA the value is currently invalid. The 

device must clear the Address Resolved flag to indicate that it has not 

had its slave address assigned. Proceed to step 6.

• N/A

4.

The device has a valid PSA so it assumes that slave address for now. 

However, this address has not been resolved by the ARP Master so the 

device must clear its Address Resolved flag. Proceed to step 6.

• N/A

5.

The device does not support PSA so it must clear its Address Valid and 

Address Resolved flags. Proceed to step 6.

• [FW] Deassert SMTARPCTRL.AV*
• [FW] Deassert SMTARPCTRL.AR*

6.

If supported, the device masters the SMBus and sends the Notify ARP 

Master command. This informs the ARP Master that a new device is 

present. Proceed to step 7.

• [FW] Determine if supported; check 

SMTARPCTRL.NOTIFYENB

• [FW  and  HW

2

] Initiate Master Transaction 

)

7.

The device waits for an SMBus packet.

• [FW and HW] Wait

8.

Upon receipt of an SMBus packet the device must first check the 

received slave address against the SMBus Device Default Address. If a 

match is present, then it proceeds to step 12, otherwise it proceeds to 

step 9.

• [HW] Match the default address
• [HW] ACK the transaction if received 

slave address matches Device Default 

Address

9.

The received address is not the SMBus Device Default Address so the 

packet is potentially addressed to one of the device core functions. The 

device must check its Address Valid bits to determine whether or not to 

respond. If any of the Address Valid bits are set then it proceeds to step 

10, otherwise it must return to step 7 and wait for another SMBus 

packet.

• [HW] Check if any SMTARPCTRL.AVn are 

asserted

10.

Since the device has a valid slave address it must compare the received 

slave address to its internal slave address. If a match is present, then it 

proceeds to step 11, otherwise it must return to step 7 and wait for 

another SMBus packet.

• [HW] Match any of the internal slave 

addresses

• [HW] ACK the transaction if received 

slave address matches any target 

address and that target Address Valid bit 

(SMTARPCTRL.AVn) is asserted

11.

The device has received a packet addressed to a core function so it 

acknowledges the packet and processes it accordingly. Proceed to step 

7 and wait for another SMBus packet.

• [FW and HW] Initiate Target Transaction 

12.

The device detected a packet addressed to the SMBus Device Default 

Address. It must check the command field to determine if this is the 

Prepare To ARP command. If so, then it proceeds to step 13, otherwise 

it proceeds to step 14.

• [FW] Inspects command field and 

determines how to proceed

13.

Upon receipt of the Prepare To ARP command the device must 

acknowledge the packet and make sure its Address Resolved flag is 

clear to participate in the ARP process. Proceed to step 7 and wait for 

another SMBus packet.

• [FW] Deassert SMTARPCTRL.AR* 

14.

The device checks the command field to verify if the Reset Device 

command was issued. If so, then it proceeds to step 15, otherwise it 

proceeds to step 16.

• [FW] Inspects command field and 

determines how to proceed