Texas Instruments DP83561EVM, User Manual, Page: 14 / 60

• Remove R84
• Populate R82, R77
3.3.2 External Clock
To remove the on-board 25 MHz crystal and supply an external 25 MHz clock:
• Remove R82, R77
• Populate R84
• Provide External Clock to SMA at J11
3.4 MAC Interface Breakout Connectors
The DP83561EVM comes with two MAC interface breakout boards, and RGMII back-to-back connector board,
and a MAC interface breakout board. When configuring the DP83561-SP for MII mode, the MAC interface
breakout board must be used to access the MII pins.
RGMII Back-to-Back Configuration
• Connect J4 of the main DP83561EVM board to J22 of the RGMII back-to-back connector
• Connect J19 of the RGMII back-to-back connector to a second DP83561EVM or other RGMII MAC
Note
RGMII back-to-back connector is reversible, RGMII back-to-back breakout connector can be conneted
to a DP83561EVM on either J19 or J22.
DP83561EVM
B
DP83561EVM
A
RGMII back-
to-back
Breakout
Link Partner
A
Link Partner
B
Cable Cable
Figure 3-3. DP83561EVM RGMII Back-to-Back Connection Diagram
MAC Interface Breakout Board Configuration
The MAC Interface Breakout Board can be used to directly access the MII pins of the DP83561-SP. This board
can be used for configurations such as configuring the DP83561EVM for RGMII external loopback tests as
described by
RGMII BER Testing - External Loopback Configuration , or connecting an MII MAC.
• Connect J4 of the main DP83561EVM board to J1 of the MAC interface breakout board
Board Setup Details www.ti.com
14 DP83561EVM User’s Guide SLVUC11 – APRIL 2021
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