34.1.4 Product Dependencies

The pins used for interfacing the DDR/LPDDR memories are not multiplexed with the PIO lines.

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

Table 34-2. I/O Lines Usage vs. Operating Mode
Signal Name DDR2 DDR3 DDR3L LPDDR1 LPDDR2/LPDDR3
DDR_VREF VDDIODDR/2 VDDIODDR/2 VDDIODDR/2 VDDIODDR/2 VDDIODDR/2
DDR_CAL GND via 21KΩ GND via 22KΩ GND via 23KΩ GND via 21KΩ GND via 24KΩ
DDR_CK, DDR_CLKN CLK, CLKN CLK, CLKN CLK, CLKN CLK, CLKN CLK, CLKN
DDR_CKE CLKE CLKE CLKE CLKE CLKE
DDR_CS CS CS CS CS CS
DDR_RESETN Not connected DDR_RESETN DDR_RESETN Not connected Not connected
DDR_BA[2:0] BA[2:0] BA[2:0] BA[2:0] BA[1:0] Not connected
DDR_WE WE WE WE WE CA2
DDR_RAS, DDR_CAS RAS, CAS RAS, CAS RAS, CAS RAS, CAS CA0, CA1
DDR_A[13:0] A[13:0] A[13:0] A[13:0] A[13:0] CAx, with x>2
DDR_D[31:0] D[31:0] D[31:0] D[31:0] D[31:0] D[31:0]
DDR_DQS[3:0], DDR_DQSN[3:0] LDQS,UDQS, DDR_VREF(1) DQS[3:0], DQSN[3:0] DQS[3:0], DQSN[3:0] DQS[3:0], DDR_VREF DQS[3:0], DQSN[3:0]
DDR_DQM[3:0] UDM, LDM DQM[3:0] DQM[3:0] DQM[3:0] DQM[3:0]
Note:
  1. DDR_DQSN[3:0] can be connected to DDR_VREF or to DQSN[3:0] of the memory, as specified in the DDR2-SDRAM device datasheet. Bit MPDDRC_CR.NDQS is to be set accordingly.