Hi,
I've never used the QSH signals as single ended IO.
Page 12 of The Roach1 Schematics shows the source of the QSH_A/B_D_P/N
signals
as FPGA IO banks 3, 11, 13, 15, 17, 19, 21
page 4 shows those banks powered at 2V5 aka 2.5VDC.
The 2V5 signal is hardwired to the VCCIO pins; there is no jumper.
Thus I'd predict only 2.5V IO levels would be supported on the QSH
signals.
Matt
On Tue, 11 Jul 2017, indrajit wrote:
> Date: Tue, 11 Jul 2017 08:35:21 +0530
> From: indrajit <indra...@iiap.res.in>
> To: CASPER Mailing List <casper@lists.berkeley.edu>
> Subject: [casper] QSH I/O as single ended signal.
>
> Dear All,
>
> Is there any one used QSH-DP LVDS I/O on ROACH-1 as single ended signal
> output.
> QSH Yellow block has an option Single ended.
> If then what is the output level is it 3.3V or 2.5 V ?
>
> Thanks
> Indrajit
>
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