Datasheet 91
Electrical Specifications
7.6 Signal Groups
Signals are grouped by buffer type and similar characteristics as listed in Tab le 7 - 37.
The buffer type indicates which signaling technology and specifications apply to the
signals. All the differential signals, and selected DDR3 and Control Sideband signals
have On-Die Termination (ODT) resistors. There are some signals that do not have ODT
and need to be terminated on the board.
Table 7-37.Signal Groups
1
(Sheet 1 of 3)
Signal Group
Alpha
Group
Type Signals
System Reference Clock
Differential (a) CMOS Input BCLK, BCLK#
PEG_CLK, PEG_CLK#
DPLL_REF_SSCLK, DPLL_REF_SSCLK#
Differential (b) CMOS Output BCLK_ITP, BCLK_ITP#
DDR3 Reference Clocks
2
Differential (c) DDR3 Output SA_CK[1:0], SA_CK#[1:0]
SB_CK[1:0], SB_CK#[1:0]
DDR3 Command Signals
2
Single Ended (d) DDR3 Output SA_RAS#, SB_RAS#, SA_CAS#, SB_CAS#
SA_WE#, SB_WE#
SA_MA[15:0], SB_MA[15:0]
SA_BS[2:0], SB_BS[2:0]
SA_DM[7:0], SB_DM[7:0]
SM_DRAMRST#
SA_CS#[1:0], SB_CS#[1:0]
SA_ODT[1:0], SB_ODT[1:0]
SA_CKE[1:0], SB_CKE[1:0]
DDR3 Data Signals
2
Single ended (e) DDR3 Bi-directional SA_DQ[63:0], SB_DQ[63:0]
Differential (f) DDR3 Bi-directional SA_DQS[7:0], SA_DQS#[7:0]
SB_DQS[7:0], SB_DQS#[7:0]
TAP (ITP/XDP)
Single Ended (g) CMOS Input TCK, TMS, TRST#
Single Ended (ga) CMOS Input TDI,TDI_M
Single Ended (h) CMOS Open-Drain
Output
TDO, TDO_M
Single Ended (i) Asynchronous
CMOS Output
TAPPWRGOOD
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