Ublox NINA-W1 Series User Manual

NINA-W1 series - User Manual
Figure 1: RMII clock delay circuit
u-connectXpress software senses the RMII_CLK input (GPIO27) at startup. If an RMII clock is
discovered, then Ethernet communication is initiated.
During startup of NINA-W1 series modules the RMII clock must be started within 100 us, but not
before an initial delay of 1.2 ms.
1.6.2.2 MAC to PHY connection
When connecting NINA-W1 series modules to an external PHY circuit, both the RMII and SMI
interfaces must be connected. The default PHY address (0x1) must be configured on the PHY side.
Follow the recommendations of your chosen PHY chip supplier for implementation details.
An example of a PHY implementation is shown in Figure . PHY KSZ8081 is recommended and used
on the EVK-NINA-W1.
Figure 2: EVK-NINA-W1 Ethernet PHY implementation
1.6.2.3 MAC to MAC connection
When connecting NINA-W1 series modules using a direct MAC to MAC connection, the SMI interface
can be left unconnected. Depending on the routing of the RMII interface on the host PCB,
termination resistors can also be needed.
An external 50 MHz oscillator is needed while running an MAC to MAC connection.

Ublox NINA-W1 Series Specifications

General

Brand	Ublox
Model	NINA-W1 Series
Category	Wireless Router
Language	English