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marcelos |
## AliExpress HPC 40GbE XCKKU040 (Kintex Ultrascape HPC)
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This board is widely know as "Aliexpress HPC 40GbE XCKU040" board, from the
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same source as the K420 board. Although the FPGA is more powerful, the board
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is cheaper when compaared to the more complete board and, in fact, is
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probable the cheaper ultrascale board.
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The Kintex Ultrascale HPC board includes:
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- a XCKU040 FPGA w/ 1156 pins
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- not sure about the speed grade, guessing it is -2!
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- high-speed clocks: 100MHz 156MHz
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- on-board USB/serial (CH340)
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- on-board SPI FLASH (N25QL256)
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- on-board 2xQSFP (for up to 2x40Gbps)
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- 8 LEDs
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- 1 swiches
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- PCIe 8x
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- TAG connector (you need an external JTAG adapter!)
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- support for darkriscv running at 250MHz (single-thread)
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- tested up to 300MHz w/ overclock
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- 2x I2C setup memories (AT24C04), probably one for each QSFP?!
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Unfortunately, there is no scheatic for this board, just an Excel with the
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pins, with some labels in chinese and some small errors, but not bad at all.
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This board appears to work well when overclocked and, in fact, it exceeds
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the darkriscv frequency register, so the frequencies above 250MHz will
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appears weird!
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For example, when working at 400MHz::
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boot0: text@0 data@6268 stack@8192 (1924 bytes free)
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board: aliexpress hpc/40gbe ku040 (id=10)
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build: Mon, 01 Feb 2021 04:06:48 -0300 for rv32e
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core0/thread0: darkriscv@144.00MHz rv32e <- frequency reg overflow
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uart0: 115200 bps (div=2314)
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timr0: frequency=40075Hz (io.timer=399) <-- 400M/(399+1)=1us
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Finally, be careful that the Ultrascale needs TWO boot images, so you need
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generate the primary and secondary MCS file (just select in Vivado the
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option to generate the FLASH image and the wizard will generate them).
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