17.4 I/O Lines Description

Table 17-1. DDR/LPDDR I/O Lines Description
Name Function Type Active Level
DDR/LPDDR Controller
VDDIODDR Power supply of memory interface Power
DDR_VREF Reference voltage Input
DDR_ZQ Calibration reference Input
DDR_ODT On-Die-Termination Output
DDR_D[15:0] Data bus I/O
DDR_A[15:0] Address bus Output
DDR_DQM[1:0] Data mask Output
DDR_DQS[1:0] Data strobe I/O
DDR_DQSN[1:0] Negative data strobe I/O
DDR_CSN Chip select Output Low
DDR_RESETN DDR3 active low asynchronous reset Output Low
DDR_CLK, DDR_CLKN Differential clock Output
DDR_CKE Clock enable Output High
DDR_RASN Row signal Output Low
DDR_CASN Column signal Output Low
DDR_WEN Write enable Output Low
DDR_BA[2:0] Bank Select Output