BASYS 3 description is wrong?

[TanjB]

The Digilent product page and box claim there are 33280 logic elements / 5200 slices and 1,800 kbit of memory in the FPGA.

But the FPGA is identified as an Artix-7 35, which is significantly smaller than that.  You would need a 7-50 to match the claimed specs.

This seems like a large error in the claimed spec for your board?

[JColvin]

Hi @TanjB,

The quoted values of 33280 logic cells, 5200 slices, and 1800 kbits are accurate for an Artix 7 35T; these values were pulled from Table 4 of Xilinx's DS180: https://www.xilinx.com/content/dam/xilinx/support/documents/data_sheets/ds180_7Series_Overview.pdf.

Let me know if you have any questions about this.

Thanks,
JColvin

[TanjB]

Ah.  I was going by what was in Vivado when the part is selected.  There seems to be a problem at Xilinx.  Only 2/3rds of the device seems to be supported.  These same numbers are visible in video tutorials for Basys3 shown online, so it is not just my copy of Vivado.

Edited May 3, 2022 by TanjB

[TanjB]

OK, I figured it out.  LUT elements is an exactly defined number, for any given chip.  "logic cells" is just a made up marketing number intended to convey overall capability:

https://xilinx.fandom.com/wiki/Logic_Cells

Got it now.