ADIN1110BCPZ-R7 datasheet(23/104 Pages) AD

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Data Sheet

ADIN1110

ON-CHIP DIAGNOSTICS

analog.com

Rev. 0 | 23 of 104

TEST MODES

The ADIN1110 provides several test modes that allow testing of

the transmitter waveform, distortion, jitter, and droop. These test

modes change only the data symbols provided to the transmitter

circuitry and do not alter the electrical and jitter characteristics of

the transmitter and receiver from the normal operation.

The following test modes included in theADIN1110 are defined in

Subclause 146.5.2 from the IEEE 802.3cg:

►

Test Mode 1. This is a transmitter output voltage and timing jitter

test mode. When this mode is selected, the ADIN1110 repeatedly

transmits the data symbol sequence (+1, –1).

►

Test Mode 2. This is a transmitter output droop test mode. In this

mode, the ADIN1110 transmits ten +1 symbols followed by ten

−1 symbols. This sequence repeats indefinitely.

►

Test Mode 3. Normal operation in idle mode test mode. When

this test mode is selected, the ADIN1110 transmits as in non test

operation and in the master data mode with data set to normal

interframe idle signals.

In addition to these test modes, the ADIN1110 provides the trans-

mit disable mode defined in Subclause 45.2.1.186a.2. This mode

maintains both the receive and transmit path active as in normal

operation, but only transmits 0 symbols. This mode can be used to

measure the MDI return loss specified in Subclause 146.8.3.

Accessing Test Mode 1 to Test Mode 3

To set the ADIN1110 into Test Mode 1, Test Mode 2, or Test

Mode 3, the device must be in software power-down mode

(CRSM_SFT_PD). The power-down status of the ADIN1110

can be checked reading the software power-down status bit

(CRSM_SFT_PD_RDY).

When the ADIN1110 is in software power-down mode, disable

autonegotiation by clearing the autonegotiation enable bit (AN_EN).

With autonegotiation disabled, force the autonegotiation con-

figuration by writing to the autonegotiation forced mode bit

(AN_FRC_MODE_EN).

The desired test mode can now be selected by writing the ap-

propriate value to the 10BASE-T1L test mode control register

(B10L_TEST_MODE_CNTRL) and exiting the device from power-

down by clearing the software power-down bit (CRSM_SFT_PD).

Accessing Transmit Disable Test Mode

To configure the ADIN1110 in the transmit disable test mode, the

device must be in software power-down mode (CRSM_SFT_PD).

The power-down status of the ADIN1110 can be checked reading

the software power-down status bit (CRSM_SFT_PD_RDY).

When the ADIN1110 is in software power-down mode, disable

autonegotiation by clearing the autonegotiation enable bit (AN_EN).

With autonegotiation disabled, force the autonegotiation con-

figuration by writing to the autonegotiation forced mode bit

(AN_FRC_MODE_EN).

The transmit disable test mode can now be enabled by setting the

B10L_TX_DIS_MODE_EN bits to 1. To exit from the test mode,

write 0 to CRSM_SFT_PD.

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