ADIN2111CCPZ-R7 datasheet(30/129 Pages) AD

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Data Sheet

ADIN2111

ON-CHIP DIAGNOSTICS

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Rev. A | 30 of 129

Figure 10. ADIN2111 Loopback Modes

FRAME GENERATOR AND CHECKER

The two PHYs on the ADIN2111 can be configured to generate

frames and to check received frames (see Figure 11). The generat-

ing and checking functions can be used together or independently.

If the ADIN2111 PHY 1 (respectively PHY 2) transmitted frames

are looped back at the remote end, the frame checker on PHY

1 (respectively PH Y2) can be used to check the echoed self

generated frames.

Frame Generator

When the frame generator is enabled, the MAC interface is ignored

and the frame generator data is used for transmission on the

MDI pins. To use the frame generator, the diagnostic clock must

also be enabled using the CRSM_DIAG_CLK_EN bit in the CRSM

diagnostics clock control register (CRSM_DIAG_CLK_CTRL).

The frame generator control registers configure the type of frames

to be sent (for example, random data, all 1s), the frame length, and

the number of frames to be generated.

The generation of the requested frames starts by enabling the

frame generator by setting the FG_EN bit in the frame generator

enable register (FG_EN).

When the generation of the frames completes, the frame generator

done bit, FG_DONE, is set in the frame generator done register

(FG_DONE).

Frame Checker

The frame checker is enabled by setting the frame checker enable

bit (FC_EN) in the frame checker enable register (FC_EN). The

frame checker can be configured to check and analyze received

frames from either the MAC interface or the PHY using the frame

checker transmit select bit (FC_TX_SEL) in the frame checker

transmit select register (FC_TX_SEL). The frame checker reports

the number of frames received, CRC errors, and various frame

errors. The frame checker frame counter registers and the frame

checker error counter registers count these events.

Error Counters

The frame checker counts the number of CRC errors, and

these errors are reported in the receive error count register

(RX_ERR_CNT). To ensure synchronization between the frame

checker error counter and frame checker frame counters, all of

the counters are latched when the receive error counter register

is read. Therefore, when using the frame checker, read the re-

ceive error counter first, and then read all other frame counters

and error counters. A latched copy of the receive frame counter

(FC_FRM_CNT_H) and the frame checker count low register

(FC_FRM_CNT_L).

In addition to CRC errors, the frame checker counts frame length

errors, frame alignment errors, symbol errors, oversized frames

errors, and undersized frame errors.

The frame checker also counts frames with an odd number of

nibbles in the frame, and counts packets with an odd number of

nibbles in the preamble.

The frame checker also counts the number of false carrier events,

which is a count of the number of times the bad start of stream

delimiter (SSD) state is entered.

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