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GrCa_1363456
Level 5
Level 5
First comment on KBA First comment on blog 250 sign-ins

Why might the output be inverted?

A board using CY2308SXI-1 seems to be inverting the output on bypass mode (S2=1; S1 =0).

But according to the data sheet the output is only inverted from the reference clock for the -2 or -3 devices. 

GrCa_1363456_0-1651862112551.png

 

GrCa_1363456_1-1651862112555.png

Note: R57 not installed

 

GrCa_1363456_2-1651862112559.jpeg

G

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PradiptaB_11
Moderator
Moderator
Moderator
500 replies posted 250 solutions authored 250 replies posted

Hi @GrCa_1363456 ,

Can you provide a top marking photo of the CY2308-1 device on the board. Can you confirm it is CY2308-1 device only. As the Outputs are inverted and PLL bypass mode for 2308-2 and 2308-3, S2 = 1 and S1 = 0. So this might be the case why you are observing the inverted outputs.

Thanks,

Pradipta.

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PradiptaB_11
Moderator
Moderator
Moderator
500 replies posted 250 solutions authored 250 replies posted

Hi @GrCa_1363456 ,

Can you provide a top marking photo of the CY2308-1 device on the board. Can you confirm it is CY2308-1 device only. As the Outputs are inverted and PLL bypass mode for 2308-2 and 2308-3, S2 = 1 and S1 = 0. So this might be the case why you are observing the inverted outputs.

Thanks,

Pradipta.

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