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Signal Name Description Direction / Buffer
Type
SB_CKE[3:0]
Clock Enable: (1 per rank). These signals are used to:
• Initialize the SDRAMs during power-up.
• Power-down SDRAM ranks.
• Place all SDRAM ranks into and out of self-refresh during
STR.
O
DDR3/DDR3L
SB_CS#[3:0]
Chip Select: (1 per rank). These signals are used to select
particular SDRAM components during the active state. There is
one Chip Select for each SDRAM rank.
O
DDR3/DDR3L
SB_ODT[3:0]
On Die Termination: Active Termination Control. O
DDR3/DDR3L
6.2 Memory Reference and Compensation
Table 25. Memory Reference and Compensation
Signal Name Description Direction /
Buffer Type
SM_RCOMP[2:0]
System Memory Impedance Compensation: I
A
SM_VREF
DDR3/DDR3L Reference Voltage: This signal is used as
a reference voltage to the DDR3/DDR3L controller and is
defined as V
DDQ
/2
O
DDR3/DDR3L
SA_DIMM_VREFDQ
SB_DIMM_VREFDQ
Memory Channel A/B DIMM DQ Voltage Reference:
The output pins are connected to the DIMMs, and holds
V
DDQ
/2 as reference voltage.
O
DDR3/DDR3L
Signal Description—Processor
Intel
®
Xeon
®
Processor E3-1200 v3 Product Family
June 2013 Datasheet – Volume 1 of 2
Order No.: 328907-001 79