LPC MicrocontrollersのトピックRe: LPC54606 usage with KSZ8091RNB

LPC54606 usage with KSZ8091RNB

rene_benvenuti — Mon, 09 Mar 2020 16:52:46 GMT

Hi,

We are plannig to develop a board using 100-pin LPC54606 and add ethernet communication with KSZ8091RNB RMII phy.

We already have a similar product using LPC4078 processor, however, I notice that RMII pins are different on these processors. For LPC4078 we use the CRS_DV MAC pin, witch is missing on LPC546x. We also tried out to use RX_DV pin for this function on LPC4078 without success.

It is possible to use LPC546x in RMII mode? We are not sure about using the RX_DV pin for the same role of CRS_DV.

Best regards,

Renê

Re: LPC54606 usage with KSZ8091RNB

diego_charles — Tue, 10 Mar 2020 23:36:37 GMT

Yes is possible to use LPC546x in RMII mode.

As you could check, in our schematic for the LPCxpresso546x,

the LAN8720A-CP PHY, which supports the RMII MAC interface, is implemented among the LPC54608 RMII interface.

Please note that in the schematic design the ENET_RX_DV pin of the LPC546x is connected to the CRS_DV pin of the PHY.

Best regards, Diego.

Re: LPC54606 usage with KSZ8091RNB

rene_benvenuti — Wed, 11 Mar 2020 11:51:16 GMT

Thanks for your help, Diego!

We will try it out on KSZ8091 PHY.