BT8376EPF datasheet(162/323 Pages) CONEXANT

162 / 323 page

Bt8370/8375/8376

3.7 Receive LIU Registers

Fully Integrated T1/E1 Framer and Line Interface

3-44

Conexant

N8370DSE

028—Equalizer Output Levels

EQ_OUT7:0]

All EQ_OUT register bits are internally set to a default value during RESET. Under normal

line operating conditions, the processor should not change this default value.

M1_ERR[1:0]

Mode1 Eyeopen Threshold—Selects equalizer error tolerance during Mode1 (ACQUISITION

state), specified as a percentage of the full-scale equalizer output. The equalizer automatically

restarts if the average error output exceeds the selected threshold.

00 = ± 13% error tolerance

01 = ± 19% error tolerance

10 = ± 26% error tolerance

11 = ± 32% error tolerance (default)

M2_ERR[1:0]

Mode2 Eyeopen Threshold—Selects equalizer error tolerance during Mode2 (OPERATION

state), specified as a percentage of the full-scale equalizer output. The equalizer automatically

restarts if the average error output exceeds the selected threshold. During certain test

situations, where the receive LIU bipolar signal level input is allowed to vary more than 15 dB

without an intervening loss of signal condition, this ensures that the equalizer adapts to the

modified input level.

0 = ± 13% error tolerance

01 = ± 19% error tolerance (default)

10 = ± 26% error tolerance

11 = ± 32% error tolerance

EQ_OUT[3:0]

Equalizer Output Level—Selects the targeted equalizer positive/negative pulse height,

specified as a percentage of the full scale equalizer output. Figure 3-1 illustrates the equalizer’s

eye pattern output level and its relationship to the M1_ERR and M2_ERR error tolerance

thresholds.

1001 = 61% of full scale

1010 = 68% of full scale (default)

1011 = 74% of full scale

1100 = 81% of full scale

EQ_OUT[7]

EQ_OUT[6]

EQ_OUT[5]

EQ_OUT[4]

EQ_OUT[3]

EQ_OUT[2]

EQ_OUT[1]

EQ_OUT[0]

M1_ERR[1:0]

M2_ERR[1:0]

EQ_OUT[3:0]

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