On 11/8/21 11:50 AM, Claudiu Schiaua wrote:
> On Tue, 2021-09-28 at 20:36 +0200, David Emschermann wrote:
>>
>
> During the last few weeks I tried to debug the connection to GBT-SC on
> TRD2D CROB. The response of GBT-SC is not error but flat, the same value
> for whatever command I send, which suggest that GBT-SC is clocked from
> the e-link but ignores the data sent to it. I believe the reason is that
> some jumpers are missing on the CROB board, most likely disconnected by
> me ~ 1 year ago when I worked on the connection to the master GBTx.
>
> The critical jumper probably is the one disabling auxiliary I2C port on
> GBT-SC. On CROB, a jumper must be present on CON7 between pins 11 and
> 12. Most likely, this is sufficient. The CROB board we received recently
> have this jumper. However, in order to fully comply with GBT-SC
> requirements, the following jumpers must also be present:
>
> On CON7: 8-10 and 7-9 (this put auxPortSDA/SCL to ground, as specified
> in GBT-SC manual).
>
> Pin 16 of CON7 should be tied to 1.5V (disable Auxiliary E-port),
> however this require a wire from pin 16 on CON7 to pin 1 (or 2) on CON4.
> Pins 31,32,33,34 of CON8 are also ok, however the distance from CON7 to
> CON8 is longer.
>
> Also, although probably not required, in the cave configuration it is
> better to have CON31 and CON32 populated with jumpers (this connect
> FEAST 1.5V POWER_GOOD to GBT0 and GBT_SC RESET_B). Most likely this
> jumpers are not installed, as I used the reset buttons frequently during
> the local development and open jumpers are better in that case.
>
>> Cheers
>>
>>    David
>>
>
> Thanks,
> Claudiu