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Is possible using SPI without SPI.h library with just using digitalWrite function?

Yes you can, every time the clock changes in a spi bus (usually on rising edge of clock) you find out what the data input pin is doing and then record that into a variable (with a shift function). You ...
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Effect of Ethernet PHY interface on the speed of Ethernet

The ethernet controller will exchange packets through a 10Mbit/s or a 100Mbit/s link. Those packets are sent from or stored into internal memory in the controller, at full speed. The rest is up to you,...
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Effect of Ethernet PHY interface on the speed of Ethernet

The chip can connect at 10 Mbps and 100 Mbps Ethernet link speeds, and it has a maximum SPI bus speed of 40 MHz. So yes, even if it can communicate with 100 Mbps link speed, it won't achieve 100 Mbps ...
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Effect of Ethernet PHY interface on the speed of Ethernet

The Ethernet controller datasheet you link claims 10/100 Mbit/s speeds, not Gbit/s speeds. The controller is capable of negotiating with other 10BASE-T or 100BASE-TX interfaces on the network, and of ...
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Effect of Ethernet PHY interface on the speed of Ethernet

Ethernet link speeds range from 10 Mbit/s to 400 Gbit/s currently. Generally, each Ethernet frame must be transmitted atomically, without any pauses. For low-speed devices, that mandates decoupling ...
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