RT1052 SEMC - SDRAM Sleep / Low Power

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RT1052 SEMC - SDRAM Sleep / Low Power

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Contributor V

How do you put the RT1052's SEMC for SDRAM into low power mode (assuming the same ISSI SDRAM that's used in the EVK, etc)?


I saw some mention of a deep sleep mode for other NXP parts' SEMC.

How do we do the same here?

Might be irrelevant, but we initialize the SDRAM w/ this code:

status_t BOARD_InitSEMC(void)
{
  semc_config_t config;
  semc_sdram_config_t sdramconfig;
  uint32_t clockFrq = CLOCK_GetFreq(kCLOCK_SemcClk);

  /* Initializes the MAC configure structure to zero. */
  memset(&config, 0, sizeof(semc_config_t));
  memset(&sdramconfig, 0, sizeof(semc_sdram_config_t));

  /* Initialize SEMC. */
  SEMC_GetDefaultConfig(&config);
  config.dqsMode = kSEMC_Loopbackdqspad; /* For more accurate timing. */
  SEMC_Init(SEMC, &config);

  /* Configure SDRAM. */
  sdramconfig.csxPinMux           = kSEMC_MUXCSX0;
  sdramconfig.address             = 0x80000000;
  sdramconfig.memsize_kbytes      = 32 * 1024; /* 32MB = 32*1024*1KBytes*/
  sdramconfig.portSize            = kSEMC_PortSize16Bit;
  sdramconfig.burstLen            = kSEMC_Sdram_BurstLen8;
  sdramconfig.columnAddrBitNum    = kSEMC_SdramColunm_9bit;
  sdramconfig.casLatency          = kSEMC_LatencyThree;
  sdramconfig.tPrecharge2Act_Ns   = 18; /* Trp 18ns */
  sdramconfig.tAct2ReadWrite_Ns   = 18; /* Trcd 18ns */
  sdramconfig.tRefreshRecovery_Ns = 67; /* Use the maximum of the (Trfc , Txsr). */
  sdramconfig.tWriteRecovery_Ns   = 12; /* 12ns */
  sdramconfig.tCkeOff_Ns =
      42; /* The minimum cycle of SDRAM CLK off state. CKE is off in self refresh at a minimum period tRAS.*/
  sdramconfig.tAct2Prechage_Ns       = 42; /* Tras 42ns */
  sdramconfig.tSelfRefRecovery_Ns    = 67;
  sdramconfig.tRefresh2Refresh_Ns    = 60;
  sdramconfig.tAct2Act_Ns            = 60;
  sdramconfig.tPrescalePeriod_Ns     = 160 * (1000000000 / clockFrq);
  sdramconfig.refreshPeriod_nsPerRow = 64 * 1000000 / 8192; /* 64ms/8192 */
  sdramconfig.refreshUrgThreshold    = sdramconfig.refreshPeriod_nsPerRow;
  sdramconfig.refreshBurstLen        = 1;
  return SEMC_ConfigureSDRAM(SEMC, kSEMC_SDRAM_CS0, &sdramconfig, clockFrq);
}
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NXP TechSupport
NXP TechSupport

Hi,

MIMXRT1050-EVKB board using ISSI S42S16160J-6BLI SDRAM with below description to enter into power down mode:

pastedImage_1.png

pastedImage_2.png

Before customer let external SDRAM enter into power down mode, it need to send SDRAM auto refresh command to external SDRAM.

Wish it helps.


Have a great day,
Mike

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