Bt8370/8375/8376
3.7 Receive LIU Registers
Fully Integrated T1/E1 Framer and Line Interface
028—Equalizer Output Levels
7
6
5
4
3
2
1
0
EQ_OUT[7]
EQ_OUT[6]
EQ_OUT[5]
EQ_OUT[4]
EQ_OUT[3]
EQ_OUT[2]
EQ_OUT[1]
EQ_OUT[0]
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.
7
6
5
4
3
2
1
0
M1_ERR[1:0]
M1_ERR[1:0]
M2_ERR[1:0]
EQ_OUT[3:0]
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
3-44
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
