3.3.4.1 Product Dependencies

The table below shows the connections to the various memory types.

Table 3-20. I/O Lines Usage vs. Operating Modes
Signal Name	DDR2	DDR3	DDR3L	LPDDR2/LPDDR3
DDR_VREF	VDDIODDR/2	VDDIODDR/2	VDDIODDR/2	VDDIODDR/2
DDR_ZQ	GND via 240 Ω	GND via 240 Ω	GND via 240 Ω	GND via 240 Ω
DDR_CK, DDR_CLKN	CLK, CLKN	CLK, CLKN	CLK, CLKN	CLK, CLKN
DDR_CKE	CLKE	CLKE	CLKE	CLKE
DDR_CSN	CS	CS	CS	CS
DDR_RESETN	Not connected	DDR_RESETN	DDR_RESETN	Not connected
DDR_BA[2:0]	BA[2:0]	BA[2:0]	BA[2:0]	Not connected
DDR_WEN	WE	WE	WE	Not connected
DDR_RASN, DDR_CASN	RAS, CAS	RAS, CAS	RAS, CAS	Not connected
DDR_A[15:0]	A[15:0]	A[15:0]	A[15:0]	CA[9:0]
DDR_D[15:0]	D[15:0]	D[15:0]	D[15:0]	D[15:0]
DDR_DQS[1:0], DDR_DQSN[1:0]	LDQS,UDQS, DDR_VREF	DQS[1:0], DQSN[1:0]	DQS[1:0], DQSN[1:0]	DQS[1:0], DQSN[1:0]
DDR_DQM[1:0]	UDM, LDM	DQM[1:0]	DQM[1:0]	DQM[1:0]