Dear Ulf,

Attached are our test results with different PasaCtrl settings. None of 
them get the result (around 100) as you expected.
(We let X24 and X25 unconnected)

Followed is an example about how the attached file is named:
combined_8723_200.pdf  : "8723 is CPLD firmware version"; "0x200 is 
9-bit SaltroCtrl setting"
PasaCtrl = SaltroCtrl[7:0]
Bias_saltro = SaltroCtrl[8]
saltro_global_reset =  SaltroCtrl[9]

Could you please give us some advice on the test methods?

Cheers,
Yifan&Fan

On 7/16/2014 6:30 PM, Ulf Mjornmark wrote:
>
> Dear Yifan,
>
>> So far we didn't do any control of the chip which means the 
>> pasactrl[7:0] are all 0 ,I don't know if it's shutdown mode or not, 
>> could you please tell me What the value of the pasactrl should be ?
> Attached is a file with the meaning pasactrl[7:0].
> With all 0:s should the preamp be on and not in preampmode, which is 
> the normal condition.
>
> You could try different settings to see if pedestals change.
>
> We run with polarity = 1 for GEM readout, try that first.
>
>
>> Is this the only parameter needs to be set
> from the CPLD yes.
>
> I have attached a pdf document with some more info, and what the 
> reference voltages (repf,refn,incm,cmout) should be set to, these were 
> set by Lennart before shipping the protomcm.
>
> Best regards / Ulf
>
>
>  Ulf Mjornmark
>
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>
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>
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