BT8370KPF

Manufacturer Part NumberBT8370KPF
DescriptionFully integrated T1/E1 framer and line interface
ManufacturerConexant Systems, Inc.
BT8370KPF datasheet
 

Specifications of BT8370KPF

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Page 163/323:

Variable Gain Amplifier Status

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Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
Figure 3-1. Receive Equalizer Eye Pattern Output
029— Variable Gain Amplifier Status
7
6
5
VGA[5]
Indicates the current VGA gain level. The processor must write to this register (any value)
VGA[5:0]
before reading it to allow internal latches to update. The internal VGA has 64 gain values with
code value 0x3F (63 dec) equal to maximum gain. The processor can estimate the line
attenuation (or received signal level) in dB relative to a 3 V peak pulse level, according to the
following table:
Line Attenuation
0
10
VGA Gain
0x0F
0x1C
N8370DSE
ADDRESS 028 - EQ OUTPUT LEVEL (EQ_OUT)
± Error
Tolerance
Positive
Pulse Height
Negative
Pulse Height
± Error
Tolerance
4
3
VGA[4]
VGA[3]
20
30
40
0x23
0x2B
0x34
or:
0.77 dB/step—under 10 dB
1.25 dB/step—10
40 dB
1.67 dB/step—40
50 dB
2.80 dB/step—50 dB
Conexant
3.7 Receive LIU Registers
± Full Scale
2
1
0
VGA[2]
VGA[1]
VGA[0]
50
60
64dB
0x3A
0x3D
0x3F (max)
3-45