JAJSLL2B April 2021 – November 2021 DP83561-SP
PRODUCTION DATA
There are several options for Loopback that test and verify various functional blocks within the PHY. Enabling loopback mode allows in-circuit testing of the digital and analog data paths. Generally, the DP83561-SP may be configured to one of the Near-end loopback modes or to the Far-end (reverse) loopback. MII Loopback is configured using the BMCR (register address 0x0). All other loopback modes are enabled using the BIST_CONTROL (register address 0x16). Except where otherwise noted, loopback modes are supported for all speeds (10/100/1000) and all MAC interfaces (MII and RGMII).