Hardware design to using boundary scan test of i.MX7

[toshiharu_shimi]

Hi,
I use i.MX7 which is MCIMX7D3EVK10SD (12 x 12 mm) and I would like to use the Boundary scan test.
According to document "IMX7DSHDG" that mentioned as following.

So, My hardware design will supply to PCI PHY, but MCIMX7D3EVK10SD has no PCIE_VPTX pin.
(MCIMX7D5EVM10SD(19 x 19 mm) has PCIE_VP pin , PCIE_VPH pin and PCIE_VPTX pin.)
Should I design to power supply to  only PCIE_VP pin and PCIE_VPH pin?

[joanxie]

what do you mean MCIMX7D3EVK10SD has no PCIE_VPTX pin? do you mind sharing your connection about PCIE_VP pin and PCIE_VPH pin?

[toshiharu_shimi]

Hi, @joanxie 
According to Data sheet IMX7DCEC.pdf, in table 99 "iMX7Dual 12x12mm supplies contact...",  there are PCIE_VP (AB13 Ball) and PCIE_VPH (Y15 Ball), but no PCIE_VP_TX.

On the other hand, table101 "iMX7Dual 19x19mm supplies contact...", There is PCIE_VP_TX (AA11 pins).

I use 12 x 12mm package. So that, I can not connect supply power to PCIE_VP_TX ball.

[joanxie · Accepted solution]

yes, correct, you can compare the difference between them

19x19

12x12

[toshiharu_shimi]

Hi, @joanxie 

As per your reply, I  intend to power supply to PCIE_VP and PCIE_VPH for using Boundary Scan.

I don't use PCIe function, in that case, should other PCIe signals  (ex. PCIE_REXT)  are connected to floating or tie to grand?

Should I follow the "Table 5 Recommended connections for unused analog interfaces"  in "IMX7DCEC.pdf" excluding PCIE_VP and PCIE_VPH?

like below fig.?

[joanxie]

yes, if you don't use it, you can refer to the design guide

[toshiharu_shimi]

I attempt to power supply to PCIE_VP and PCIE_VPH for using Boundary Scan.
Although I don't use PCIE, Current consumption is up 70mA.
I guess I use MIPI, so that current consumption of PCIE up too.
I set to disable PCIE_CTRL_CLK_ROOT and PCIE_PHY_CLK_ROOT of  LPCG. But it has no effect on current consumption. 
In that case, Are there other way to reduce the current consumption?

Would you teach me how to configure PCIe Full Powerdown mode?