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Explorer
Explorer
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Registered: ‎09-04-2015

Need of separate 1.8V rails - VCC1V8_FPGA and VADJ_1V8_FPGA in VCU108 EVM

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In VCU108 EVM, VCCAUX/VCCAUX_IO/VCCO_0/VCCO_65/VCCO_84 /VCCO_94 is connected to VCC1V8_FPGA and VCCO_47/VCCO_48/VCCO_66/VCCO_67/VCCO_68 is connected to VADJ_1V8_FPGA. We believe this is done to power off the banks 47/48/66-68 when any FMC card is not connected. Please confirm.

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Explorer
Explorer
12,515 Views
Registered: ‎10-14-2015

Re: Need of separate 1.8V rails - VCC1V8_FPGA and VADJ_1V8_FPGA in VCU108 EVM

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Hi @raja1,

 

Yes you are right.

 

Please refer page 95 in UG1066

http://www.xilinx.com/support/documentation/boards_and_kits/vcu108/ug1066-vcu108-eval-bd.pdf

 

This rail powers both the FMC HPC0 (J22) and the FMC HPC1 (J2) VADJ pins, as well as the XCVU095 HP banks 47, 48, 66, 67, and 68 (see Table 1-3). The valid values of the VADJ_1V8 rail are 1.2V, 1.5V, and 1.8V. At power on, the system controller detects if an FMC module is connected to each interface: • If no cards are attached to the FMC ports, the VADJ voltage is set to 1.8V. • When one FMC card is attached, its IIC EEPROM is read to find a VADJ voltage supported by both the VCU108 board

 

Thanks,

Sarada

 

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Explorer
Explorer
12,516 Views
Registered: ‎10-14-2015

Re: Need of separate 1.8V rails - VCC1V8_FPGA and VADJ_1V8_FPGA in VCU108 EVM

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Hi @raja1,

 

Yes you are right.

 

Please refer page 95 in UG1066

http://www.xilinx.com/support/documentation/boards_and_kits/vcu108/ug1066-vcu108-eval-bd.pdf

 

This rail powers both the FMC HPC0 (J22) and the FMC HPC1 (J2) VADJ pins, as well as the XCVU095 HP banks 47, 48, 66, 67, and 68 (see Table 1-3). The valid values of the VADJ_1V8 rail are 1.2V, 1.5V, and 1.8V. At power on, the system controller detects if an FMC module is connected to each interface: • If no cards are attached to the FMC ports, the VADJ voltage is set to 1.8V. • When one FMC card is attached, its IIC EEPROM is read to find a VADJ voltage supported by both the VCU108 board

 

Thanks,

Sarada

 

--------------------------------------------------------------------------------------------
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Give kudos in case a post in case it guided to the solution.

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