Datasheet

Configuration Registers
3-20 Intel
®
E8870 Scalable Node Controller (SNC) Datasheet
28:26 RV 0 Reserved
25 RW 0
IIO: Initiate Initialization Operation
When set to 1, the execution of the initialization operation specified by the IOP
starts. After the execution is completed, the SNC clears this bit to 0. The
software must check to see if this bit is 0 before writing to this bit. The
operations which specify register data read from the DDR-SDRAM will have
the data valid in the RCD register when this is cleared to 0.
24 RV 0 Reserved
23:21 RW 0
CID
Select one out of one DMH on amain channel. CID will appear in the packet
and will not affect chipset operation.
20 RW 0
BA
This field enables the DMH on every main channel. BA will appear in the
packet and will not affect chipset operation.
19 RV 0 Reserved
18:11 RW 0
MRA: DMH Register Address
This field specifies the register address for the register read and write
operations and the byte address for Serial Presence Detect Operations.
10:5 RW 0
DIMM
This field specifies the DIMM to be addressed by Serial Presence Detect IOPs.
The mapping of values in this field to DIMMs is as specified in the Intel
®
E8870DH DDR Memory Hub (DMH) Datasheet. “Correspondence between
SPD DIMM numbers and DIMM Rows in MIT register” defines how the values
in this field map to those in the MIT register.
4:0 RW 0
IOP: Initialization Opcode
This field specifies the initialization operation to be done on DDR SDRAM or
DMH.
Bits[4:0] Operation Specified
00000 DMH Register Read
00001 DMH Register Write
01001 DMH SIO reset
01101 Serial Presence Detect Write
01110 Serial Presence Detect Read
11000 SNC RACs Manual Current Calibration
11001 SNC RAC Load RAC 0 Config Register
11010 SNC RAC Load RAC 1 Config Register
00011 SNC RAC Load RAC 2 Config Register
00111 SNC RAC Load RAC 3 Config Register
11011 SNC RAC Initialize
11100 SNC RAC Auto Current Calibration
11101 SNC RAC Thermal Calibration
11110 DMH Time Sync
Refer to Intel
®
E8870DH DDR Memory Hub (DMH) Datasheet.
All combinations not shown above are reserved.
Device: NodeID
Function: 1
Offset: 54h (Continued)
Bit Attr Default Description