I really wonder why Digilent recommends this. It is possible to use 100 MHz, to use the board clock directly, and to avoid a PLL/MMCM to generate 200 MHz. In my design the MIG runs with 100 MHz and seems to work.
So question: What was the reason use 200 MHz (and thus an additional PLL/MMCM) ?
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wfjmueller
When I ported the w11 CPU design from Nexys4 to Nexys A7 I didn't use the SRAM to DDR component but wrote my own interface layer which queues writes and includes a 'last row buffer', see sramif_mig_nexys4d and sramif2migui_core.
I had a look at the Nexys 4 DDR Xilinx MIG Project and was a bit astonished to see that the SYS_CLK was 200 MHz
I really wonder why Digilent recommends this. It is possible to use 100 MHz, to use the board clock directly, and to avoid a PLL/MMCM to generate 200 MHz. In my design the MIG runs with 100 MHz and seems to work.
So question: What was the reason use 200 MHz (and thus an additional PLL/MMCM) ?
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