| Electronics > Beginners |
| Ethernet MAC to MAC connection within a Board |
| (1/1) |
| rakeshm55:
Hi, I have read in some blogs that it is possible connect EMAC to EMAC (RMII interface) without having PHY chipsets within a board. Thus I can create a Standard high speed interface between two processors with lesser power consumption than having a full-fledged ethernet interface. Is there any application note specifying this scheme?? other than passive mention in blogs I cound not find solid information on this scheme. Is this technique commonly used. I have read (http://www.ti.com/lit/an/snla079d/snla079d.pdf) RMII to support a trace length of 6 inches. In Normal scenario Ethernet PHY acts as a passive device connection to MAC. In the new scheme PHY will be replaced by MAC. IN this case is there any specific configuration needed for MAC replacing PHY?? Thanks in Advance |
| rakeshm55:
My primary aim is to have relatively low power high speed serial interface. |
| Cliff Matthews:
Full duplex 50Mbps costs about $6usd.. is that fast enough? https://www.mouser.ca/datasheet/2/408/TLP2367_datasheet_en_20171025-1075458.pdf |
| ejeffrey:
Yes, I have heard you can do this as well, but never done it myself. You will need to use an external clock, rather than allowing the MACs to produce their own clock since the receive and transmit clocks need to be shared. You may need to do something with the management interface. When I have used FPGA based RMII MACs we just ignored the management interface and used the default settings for duplex/speed/etc. But if you are using a CPU with a built in MAC it will likely try to send commands to the management interface. With no PHY to receive that, I am not sure what will happen. |
| Navigation |
| Message Index |