DI0_DISP_CLK on 1.8V or 2.775V? Schematics and datasheet contradict.

[sidebranch]

We are designing an expansion board for the QSB for demo purposes.

In the IMX53QSB schematics (rev. D), in the expansion header description, the DISP0_DCLK signal has a "1.8V" label.

However, it directly connects to the IMX53 IPU DI0_DISP_CLK (pin H4), which according to the datasheet (rev. 4), is on the NVCC_LCD power rail. This is 2.775V.

What is correct, 1.8V or 2.775V?

The same question goes for GPIO_0 (CLK0)?

[NitinSonar]

Hi,

We also did expansion board design and the said signals are at 2V7 level.

Best Regards

Nitin Sonar

[fei_liu]

Hi, Leon

I think the DISP0_DCLK/GPIO_0 label on the connector is wrong.

DISP0_DCLK belongs to power rail: NVCC_LCD  which in 53QSB is 2.775V. 

GPIO_0 belongs to NVCC_GPIO. In 53QSB it's 3.3V.

Both of these two power rails can be set to other voltage level, such as 1.8V, depends on the interconnecting IO level.