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abhijithcd
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Registered: ‎06-22-2017

VC707 FMC pin mapping Error in user manual

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Hello everyone,

 

I am mapping the pins FMC 2 HPC of VC707 evaluation board in xdc file. According to the board user manual (v 1.7.1), the F32 and E30 pins of FMC2 are both connected to AT20 pin of U1 FPGA.

 

I think there has been a typo. I tried to find a new version of the document but could not find it.

Can you please help me with the correct mapping of those pins?

 

Thanks and Regards,

Abhijith 

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gnarahar
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Registered: ‎07-23-2015

@abhijithcd


Does that mean the particular HPC pins are not connected to FPGA at all? 


HBxx pins on FMC2 connector are open. HBxx pins on FMC1 connector are connected to FPGA. 


As in my FMC card has some data pins which were previously connected to FPGA through the HBxx pins on the FPGA. Where would it be connected to FPGA if I move the same card from FMC1 to FMC2 port? 

If you move to FMC2, they will be No connect

- Giri
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gnarahar
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@abhijithcd From User Guide v1.7.1 Page#59 :

 

The VC707 board FMC2 HPC connector J37 implements a subset of the maximum signal and clock connectivity capabilities:
• 58 differential user-defined pairs (as shipped with the Virtex-7 XC7VX485T-2FFG1761C FPGA installed on the VC707 board, the FMC2 HB00-HB21 bus connections are not supported.

 

Refer to this AR: https://www.xilinx.com/support/answers/50804.html

- Giri
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abhijithcd
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@gnarahar

 

Thank you for the info.

Does that mean the particular HPC pins are not connected to FPGA at all? As in my FMC card has some data pins which were previously connected to FPGA through the HBxx pins on the FPGA. Where would it be connected to FPGA if I move the same card from FMC1 to FMC2 port?

 

Thanks and regards,

Abhijith

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gnarahar
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@abhijithcd


Does that mean the particular HPC pins are not connected to FPGA at all? 


HBxx pins on FMC2 connector are open. HBxx pins on FMC1 connector are connected to FPGA. 


As in my FMC card has some data pins which were previously connected to FPGA through the HBxx pins on the FPGA. Where would it be connected to FPGA if I move the same card from FMC1 to FMC2 port? 

If you move to FMC2, they will be No connect

- Giri
--------------------------------------------------------------------------------------------------------------------
There's no such thing as a stupid question. Feel free to ask but do a quick search to make sure it ain't already answered.
Keep conversing, give Kudos and Accept Solution when you get one.
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tenzinc
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Registered: ‎09-18-2014

Abhijithcd,

 

Just adding to Gnarahar here. A lot of the FMC pins are connected to the actual FPGA package on the board but that does not mean there is a full connection to the die from the package. In this particular case, These FMC pins are not connected to the FPGA die at all so they are useless. I do agree with you, however, the actual pin table in the user guide for the J37 FMC HPC pin F31 and F32 that the proper connections are not what is listed in the table as AV19 and AT20 but rather AU19 and AV19. You can download the actual board PCB BRD file and follow the nets and see where they end up. You can download the board files from our website.

 

@gnarahar Can you file a CR on this? Thanks!

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gnarahar
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@tenzinc Done. CR-988147 filed. 

- Giri
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shivaji.m
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@gnarahar 

In the schematics.pdf FMC2-HBxx pins are floating and even UG885 mentions the same, but the layout shows FMC2 HB00-HB20 is connected to FPGA. Which one is correct?

The board layout file i referring to vc707_Allegro_Board_Source_rdf0152_rev1_0.zip

fmc2_hb00_hb20.PNG

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gnarahar
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@shivaji.m  If you notice the FPGA pins connected in layout to FMC2_HPC_HB* nets, they are NC pins in the FPGA used on the board. Check the pinout file here

https://www.xilinx.com/support/packagefiles/v7packages/xc7vx485tffg1761pkg.txt 

- Giri
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Keep conversing, give Kudos and Accept Solution when you get one.
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