// This tests just runs a few packets at 10/100 Mbps and 1 Gbps instead of only the usual 1 Gbps

// Read from register 24 to confirm that Rx CRC check is enabled
03 00 18 00 01 ff ff

// Set speed to 1000 Mbps for a starter
01 00 22 00 04

// Setup Tx and Rx MAC addresses and type field to "IP"
// Set Tx Data at offset 0, length 14 to 123456789ABC CBA987654321 0800
10 00 00 00 0E 12 34 56 78 9A BC CB A9 87 65 43 21 08 00

// Transmit a 1000-byte frame 1 time - and expect it to be received again!
20 03 E8 00 01

// Wait (indefinitely) for missing Rx packets
22 00 00 

// Set speed to 100 Mbps - this is 10x slower!
01 00 22 00 02

// Transmit a 1000-byte frame 1 time - and expect it to be received again!
20 03 E8 00 01

// Wait (indefinitely) for missing Rx packets
22 00 00 

// Set speed to 10 Mbps - this is yet another 10x slower!
01 00 22 00 01

// Transmit a 1000-byte frame 1 time - and expect it to be received again!
20 03 E8 00 01

// Wait (indefinitely) for missing Rx packets
22 00 00 

// Halt
FF