imx.233 VDDIO_DRAM

cnguyenterasci — Tue, 09 Jul 2013 17:49:33 GMT

Hi guys,

I'm running the imx233 chip but have problems with the 2.5V VDDIO_DRAM. All the other voltages are there (5Vsupply, 3.3V, 1.8V, 1.2V) except 2.5V for my DDR memory. Is there something I need to do to enable the 2.5V regulator output on the IMX 233 chip?

Re: imx.233 VDDIO_DRAM

AnsonHuang — Wed, 10 Jul 2013 03:20:26 GMT

Hi, Calvin

You may need to enable this 2P5 regulator manually, as it is disable by default. See below code:

// DDR1,VDDM = 2.5V

// Clear pulldown as it isn't needed for internal linear regulator

HW_POWER_VDDMEMCTRL_CLR(BM_POWER_VDDMEMCTRL_PULLDOWN_ACTIVE);

HW_POWER_VDDMEMCTRL.B.TRG = 0x10; // ~2.5v

HW_POWER_VDDMEMCTRL_SET(BM_POWER_VDDMEMCTRL_ENABLE_ILIMIT);

HW_POWER_VDDMEMCTRL_SET(BM_POWER_VDDMEMCTRL_ENABLE_LINREG);

// Wait 10ms for 2p5 capacitor to fully charge

XLDRStall(20000);

HW_POWER_VDDMEMCTRL_CLR(BM_POWER_VDDMEMCTRL_ENABLE_ILIMIT);

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Re: imx.233 VDDIO_DRAM