ADIN1100BCPZ-R7 datasheet(29/80 Pages) AD

29 / 80 page

Data Sheet

ADIN1100

ON-CHIP DIAGNOSTICS

analog.com

Rev. B | 29 of 80

LOOPBACK MODES

The PHY core 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 a frame generator and frame checkers

allows completely self contained in-circuit testing of the digital and

analog data paths within the PHY core.

PMA Loopback

In PMA loopback, the MDI interface must be left open circuit,

thereby transmitting into an unterminated connector or cable. In

this mode, the signal transmitted from the ADIN1100 is echoed

back from the open 10BASE-T1L MDI. This test mode is an imple-

mentation of the PMA local loopback function defined in Subclause

146.5.6 of the IEEE Standard 802.3cg. Remove any cable connect-

ed to the MDI interface to improve the test mode accuracy.

In PMA loopback mode, the device must be configured in forced

link configuration mode (autonegotiation disabled). To enable

PMA loopback, set the 10BASE-T1L PMA loopback enable bit

( B10L_LB_PMA_LOC_EN ) to 1 (see the 10BASE-T1L PMA Con-

trol Register section).

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 transmit data pins (TXD_x signals) back to the receive

data pins (RXD_x signals) and can therefore be used to verify MAC

interface connectivity. Set the MAC_IF_LB_EN bit to 1 (see the

MAC Interface Loopbacks Configuration Register section) to enable

MAC interface loopback.

If the MAC_IF_LB_TX_SUP_EN bit within the same register is set

(enabled by default), the transmission of the signal received on the

MAC interface is not transferred to the ADIN1100 PHY core.

MAC Interface Remote Loopback

MAC interface remote loopback requires a link up with a remote

PHY and enables looping of the data received on the ADIN1100

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

complete link by ensuring that the PHY receives the proper data.

Set the MAC_IF_REM_LB_EN bit to 1 (see the MAC Interface

Loopbacks Configuration Register) to enable MAC interface remote

loopback.

If the MAC_IF_REM_LB_RX_SUP_EN bit (see the MAC Interface

Loopbacks Configuration Register section) is set (set by default),

the data received by the ADIN1100 from the MDI pins is not

transferred through the MAC interface.

External MII/RMII Loopback

Overview

When configured in external MII/RMII loopback mode, the

ADIN1100 echoes back the data received from a remote PHY. The

external MII/RMII loopback is performed by physically connecting

the MAC transmission signal pins to the MAC reception signal pins.

The wiring configuration required is described in Table 23.

Table 23. External MII/RMII Loopback Wiring

Reception Signals

Transmission Signals

RXD_0

TXD_0

RXD_1

TXD_1

RXD_21/PHYAD_0

TXD_21

RXD_31

TXD_31

RX_DV2/CRS_DV3

TX_EN

RX_ER

TX_ER

1 MII only.

2 MII reference name.

3 RMII reference name.

Software Configuration

For the external RMII loopback, the RMII TXD check enable bit,

RMII_TXD_CHK_EN (see the RMII Configuration Register section),

must be set to 1 so that CRS_DV can be connected to TX_EN.

The external MII loopback does not require any particular register

bits to be set to be enabled.

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