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Published 20 hours ago • verified publisher icon opencomputeproject

MAC_USB_PWR

Open wisxxx opened this issue 3 years ago • 3 comments

MAC_USB_PWR goes to connector P1B-B8 and thence to FPGA pin V8, IO_L14P_T2_SRCC_13, per the AC7100 schematics.

This is curious, since USB power is +5V and there is no +5 going to the FPGA. Also, what kind of IOH spec does that thing have?

wisxxx avatar Sep 26 '21 05:09 wisxxx

MAC_USB_PWR part of the USB bridge built on the MAC which is mainly used on the evaluation board of the MAC. In the Time Card we use the UART to communication with the MAC making the USB connection unnecessary.

ahmadexp avatar Oct 25 '21 12:10 ahmadexp

Nonetheless, it appears that the power input to the MAC USB interface is incorrectly connected to an I/O pin on the FPGA, as shown on the currently available schematics. Can I assume that will be fixed on updated schematics?

wisxxx avatar Oct 25 '21 15:10 wisxxx

@wisxxx, yes this is fixed. For prototype and beta versions we allowed for numerous configurations of the MAC's and SOM modules for testing and evaluation. With upcoming releases, we have a condensed feature critical version with tested performance which does not include experimental options.

AlphaBetaPhi avatar Oct 25 '21 16:10 AlphaBetaPhi

Still not fixed in "Prototype V7" schematics

Ref: file "Timingcard_PROJECT.pdf", in Time-Card/HW/ECAD/Prototype-V7/ECADv7.7z"

wisxxx avatar Nov 28 '22 16:11 wisxxx

Fixed in production board (ref. schematic "R4006-G0001-03-SC-REV02.pdf").

wisxxx avatar Feb 27 '23 18:02 wisxxx