VCCAUX_IO Value

Question

I'm designing my own baseboard for an Zynq MMP (AES-MMP-7Z045-G).

Now I'm wondering, why the documentation for the MMP as well as for the BB2 use 2.0V as VCCAUX_IO. When implementing the reference design in Vivado using the board definition files "AES-MMP-7Z045-G-Board_Definition_Files_Vivado_2015_3_v1" provided by Avnet, the design prescribes 1.8V for VCCAUX_IO in the "Power Supply Summary"

From the documentation of the Zynq 7045 I also cannot find why 2.0V should be applied here, as the DDR3 runs with only 533 MHz, which is supported with 1.8V if I read Table 53 in DS191 correctly.

Therefore, I would think I should apply 1.8V to JX1-116?

Any comment or explanation is highly appreciated.

Thanks,

Stefan

jafoste4 · Accepted Answer

Hello Svdmark,

The VCCAUX_IO rail on the MMP BB2 was implemented to support other MMP families such as the K7 MMP. In the case of Zynq MMP, the VCCAUX_IO is not used at all. The DDR3 on the Zynq MMP is PS DDR3 (not PL) and it does not use the VCCAUX_IO voltage rail. If your baseboard is designed to work with Zynq MMP only, then the VCCAUX_IO can be connected to 1.8V or 2.0V.

--Josh

VCCAUX_IO Value

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