ADIN1111CCPZ-R7 datasheet(22/109 Pages) AD

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Data Sheet

ADIN1111

ON-CHIP DIAGNOSTICS

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Rev. A | 22 of 109

FRAME GENERATOR AND CHECKER

The ADIN1111 can be configured to generate frames and to check

received frames (see Figure 14). The frame generator and checker

can be used independently to generate frames or check frames,

or the frame generator and checker can be used together to

simultaneously generate frames and check frames. If frames are

looped back at the remote end, the frame checker can be used to

check frames generated by the ADIN1111.

When the frame generator is enabled, the source of the data for the

PHY comes from the frame generator and not the MAC.

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 (FG_EN). When the generation of the frames

completes, the frame generator done bit is set (FG_DONE).

The frame checker is enabled using the frame checker enable

bit (FC_EN). The frame checker can be configured to check and

analyze received frames from either the MAC interface or the PHY,

which is configured using the frame checker transmit select bit

(FC_TX_SEL). The frame checker reports the number of frames

received, CRC errors, and various other frame errors. The frame

checker frame counter register and frame checker error counter

The frame checker counts the number of CRC errors and these are

reported in the receive error counter 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 receive error counter first, and

then read all other frame counters and error counters. A latched

copy of the receive frame counter register is available in the

FC_FRM_CNT_H register and FC_FRM_CNT_L register.

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

errors, frame alignment errors, symbol errors, oversized frames

errors, and undersized frame errors. In addition to the received

frames, the frame checker 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 the stream delimiter (bad SSD) state is entered.

Frame Generator and Checker Used with

Remote Loopback with Two MAC-PHYs

Using two MAC-PHY devices, the user can configure a convenient

self contained validation of the PHY core to PHY core connection,

or can exercise the full signal chain by using the host processor

to perform the loopback at the remote end. Figure 14 shows an

overview of how each MAC-PHY is configured. An external cable

is connected between both devices, and MAC-PHY 1 is generating

frames using the frame generator.

When limiting the test to just the PHY core portions of the

ADIN1111, MAC-PHY 2 has MAC interface remote loopback en-

abled (MAC_IF_REM_LB_EN). The frames issued by MAC-PHY

1 are sent through the cable, through the PHY 2 signal chain

returned by the PHY 2 MAC interface remote loopback, back again

through the cable, and checked by the MAC-PHY 1 frame checker.

Alternatively, the frames from MAC-PHY 1 can be sent all the way

to the host processor of the remote device and looped back from

there, through the MAC and PHY blocks within MAC-PHY 2, and

back to MAC-PHY 1.

Figure 14. Remote Loopback Used Across Two PHYs for Self Check Purposes

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