AR# 46432

Zynq Gigabit Ethernet Controller - Where is the GTX Clk port on the MAC?


The Zynq PS only has a tx_clk input to the MAC.

Where is the gtx_clk input?


There is no need for the gtx_clk input. 

The tx_clk input is used for all modes of operation.

The tx_clk is always an input to the MAC.

The clock frequency requirements for 10/100 Mbps speeds are 2.5M/25M Hz respectively and a clock of 125 MHz for 1 Gbps operations.

As a result control of the external clock source would be required and the GPIO can be used for this.

AR# 46432
Date 06/08/2020
Status Active
Type General Article