07-07-2015 09:30 AM
On my design I have XC7A15T (that has 2 GTP transceivers), and I only need to use 1 transmitter.
Please see attached XPE 84mW power estimate and actual Vivado GTP 64mW power figures.
In reality I see that enabling/powering up GTP takes about 400mW (additional) power (power control to GTP available, so I can measure total board power when GTP disable and enabled).
I am using transceivers wizard and am turning RX off. Also I have tried enabling RXPOWERDOWN and setting it to "11" but that made no difference to power consumption.
Is it possible to turn power off to RX on XC7A15T? Is it feasible to power up 1 transmitter only on XC7A15T at ~84mW?
The design is working, I am just looking to understand why such a big discrepancy in GTP power consumption.
07-21-2015 06:15 AM
11-13-2016 11:51 PM
I would like to open up this entry again, since its 1 year old.
We also see that the MGTAVcc is much higher as calculated with XPE or Vivado power report.
XPE (2016.3) calculates typ 50mA, max 74mA @ 60°C ambient, but we see 125mA for one 6,25Gbs transmitter.
We opened the Implemented Design in Vivado and double checked that the other GTPs and EYE_SCAN are turned off.