17.4.1 Product Dependencies

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

Table 17-2. 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]