ADIN1111BCPZ-R7 datasheet(27/109 Pages) AD

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Data Sheet

ADIN1111

ON-CHIP DIAGNOSTICS

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Rev. A | 27 of 109

threshold. This counter is called the slicer error spike counter. The

slicer error spike counter tracks the number of received symbols

with an absolute error above 0.3125 threshold.

Figure 18 shows four signals at the input of the slicer, with errors

greater than the 0.3125 threshold. Thus, the slicer error spike

counter reports a count of four.

Notice that the threshold (0.3125) has been chosen in a way to

provide enough headroom for spikes to be detected before they can

produce bit errors.

Relevant Register Information

Table 23 shows the relevant register information. The slicer error

spike counter is stored in a 16-bit unsigned format. Therefore,

its value is the direct read value from the corresponding register.

Reading both registers clears their values and the detection re-

starts.

The slicer input maximum absolute error can be converted to

symbol units as follows:

SlicerMaxAbsError=SLCR_ERR_MAX_ABS_VAL

4096

(5)

To perform register configuration, follow these steps:

1. Write a 0x2 to the SPIKE_CNTRS_CNTRL register.

2. Write a 0x2 to the MAX_ABS_VALS_CNTRL register.

3. Read the SLCR_ERR_MAX_ABS_VAL register, which corre-

sponds to the slicer maximum error.

4. Read the SLCR_ERR_SPIKE_CNT register, which corresponds

to the slicer error spike counter.

Perform Step 3 and Step 4 before any test to make sure that

the spike counter and maximum absolute errors are cleared. This

action is particularly useful while performing tests such as electro-

magnetic compliance because it is desired to isolate results in

pretest and during test.

Table 23. Registers to the Slicer Spike and Error Counters

Device

Address

Address Description

SLCR_ERR_MAX_ABS_VAL 0x01

0x8308

Slicer maximum absolute

error.

Latches the value of

SLCR_IN_MAX_ABS_VAL.

SLCR_ERR_SPIKE_CNT

0x01

0x8305

Slicer error spike counter.

Latches the value of

SLCR_IN_SPIKE_CNT.

SPIKE_CNTRS_CNTRL

0x01

0x800E

Specifies whether the spike

counters are held when

there is no link.

MAX_ABS_VALS_CNTRL

0x01

0x800F

Specifies whether the

maximum values are held

when there is no link.

The information from the registers in Table 23 can be color coded in

a simplified way to provide relevant diagnostics to the end user. A

recommended interpretation is explained in Table 24.

Table 24. Link Quality Indication Using Slicer Error Spike Counter and Slicer

Maximum Error

Link

Quality

Color

Indication

Conditions

Poor

Red

Slicer error spike counter > 0

Slicer maximum absolute error ≥ 0.5

Marginal

Yellow

Slicer error spike counter > 0

0.3125 ≤ slicer maximum absolute error < 0.5

Good

Green

Slicer error spike counter = 0

Slicer maximum absolute error < 0.3125

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