rscott2049Updated the Ethernet library to use the RP2040 DMA sniffer to calculate CRCs. This significantly improve performance:
| Sys Clk | Iperf CPU/SRAM | Iperf CPU/flash | Iperf DMA/SRAM | Iperf DMA/flash |
|---|---|---|---|---|
| MHz | Mbit/sec | Mbit/sec | Mbit/sec | Mbit/sec |
| 150 | 11.6 | 2.9 | 94.9 | 70.1 |
| 200 | 65.4 | 31.4 | 94.9 | 94.9 |
| 250 | 83.4 | 69.3 | 94.9 | 94.9 |
| 300 | 94.9 | 85.9 | 94.9 | 94.9 |
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