ADIN1111CCPZ-R7 datasheet(21/109 Pages) AD

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Data Sheet

ADIN1111

ON-CHIP DIAGNOSTICS

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Rev. A | 21 of 109

LOOPBACK MODES

The PHY core within the MAC-PHY provides the following loopback

modes:

►

Physical medium attachment (PMA) loopback

►

Physical coding sublayer (PCS) loopback

►

MAC interface loopback

►

MAC interface remote loopback

These loopback modes test and verify various functional blocks

within the PHY. The use of the built-in frame checker and frame

generator allows completely self contained in-circuit testing of the

digital and analog data paths within the PHY core. A loopback can

also be established that includes the MAC portion of the ADIN1111

(not limited to just the PHY core) by implementing the necessary

software within the host processor.

PMA Loopback

For PMA loopback, leave the MDI pins open circuit, thereby trans-

mitting into an unterminated connector or cable. For the most

accurate results, leave the cable disconnected. The PHY can

then operate by receiving the reflection from its own transmission.

This loopback is intended as an implementation of IEEE Standard

802.3cg Subclause 146.5.6 PMA local loopback.

Note that for 10BASE-T1L PMA local loopback, the device

must be configured in the forced link configuration mode (au-

tonegotiation disabled). Setting the B10L_LB_PMA_LOC_EN bit

(B10L_PMA_CNTRL register) enables PMA loopback.

PCS Loopback

PCS loopback mode loops the transmit data back to the receiver

within the PCS block at the input stage of the PHY digital block.

Setting the B10L_LB_PCS_EN bit (B10L_PCS_CNTRL register)

enables PCS loopback.

When the PCS loopback mode is enabled, no signal is transmitted

to the MDI pins.

MAC Interface Loopback

MAC interface loopback mode loops the data received on the MAC

interface back to the SPI host. Setting the MAC_IF_LB_EN bit

(MAC_IF_LOOPBACK register) enables MAC interface loopback.

If the MAC_IF_LB_TX_SUP_EN bit within the same register is set

(set by default), the transmission of the signal is suppressed to the

MDI pins.

MAC Interface Remote Loopback

MAC interface remote loopback requires a link up with a remote

PHY and enables looping of the data received from the remote

PHY back to the remote PHY. This linking allows a remote PHY to

verify a complete link by ensuring that the PHY receives the prop-

er data. Setting the MAC_IF_REM_LB_EN bit (MAC_IF_LOOP-

BACK register) enables MAC interface remote loopback. If the

MAC_IF_REM_LB_RX_SUP_EN bit within the same register is set

(set by default), the data received by the PHY is suppressed and

not sent to the MAC.

MAC Loopback

The MAC loopback loops the data received on the MAC transmit

channel back to the SPI host. The MAC loopback is enabled with

the P1_LOOP register.

Host Processor Loopback

Outside of the loopback modes associated with the PHY core within

the ADIN1111, the host processor can be used to create a full MAC

loopback. In a full MAC loopback, whatever frame is received from

the MAC is transmitted back to the MAC, as shown in Figure 13.

Figure 13. ADIN1111 Loopback Modes

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