RS8973 Mindspeed Technologies, RS8973 Datasheet - Page 74

• Manufacturer Part Number: RS8973
• Description: Single-chip Sdsl/hdsl Transceiver
• Manufacturer: Mindspeed Technologies

3.0 Registers
3.3 Register Description
noise_histogram_high)
A 2-byte read-only register containing all 16 bits of the unsigned noise-level histogram meter accumulator. This
meter counts the number of high-noise-level conditions which occur during each Meter Timer countdown
interval. A high-noise-level condition is defined as the absolute value of the slicer error signal exceeding
(greater than) the threshold specified in the Noise-level Histogram Threshold Register [0x2A, 2B].
Automatically loaded at the end of each countdown interval, this meter register must be read low byte first,
followed by high byte, unseparated by any other meter access (addresses 0x40 to 0x5F).
A 2-byte read-only register containing all 16 bits of the unsigned BER meter accumulator. This meter counts the
number of error-free bits recovered by the detector during each Meter Timer countdown interval. An error-free
bit is defined as a match (equal comparison) of the detector’s slicer/peak detector output and its
scrambler/descrambler output, when operating as a scrambler. When the scrambler/descrambler is operated as a
descrambler, the meter simply counts the number of logical 1s produced by the descrambler. The meter register
is automatically loaded at the end of each countdown interval, and must be read low byte first, followed by high
byte, unseparated by any other meter access (addresses 0x40 to 0x5F).
A single-byte read-only register containing 8 MSBs of the 16-bit unsigned symbol histogram meter
accumulator. This meter counts the number of + 1 or – 1 symbols detected during each Meter Timer countdown
interval. No increment occurs when a + 3 or – 3 symbol is detected. The meter register is automatically loaded
at the end of each countdown interval.
3-28
0x4A, 0x4B—Noise Level Histogram Meter Register (noise_histogram_low,
0x4C, 0x4D—Bit Error Rate Meter Register (ber_meter_low, ber_meter_high)
0x4E—Symbol Histogram Meter Register (symbol_histogram)
D[15]
D[15]
D[7]
D[7]
D[7]
7
7
7
D[14]
D[14]
D[6]
D[6]
D[6]
6
6
6
D[13]
D[13]
D[5]
D[5]
D[5]
5
5
5
Preliminary Information
D[12]
D[12]
D[4]
D[4]
D[4]
4
4
4
Conexant
D[11]
D[11]
D[3]
D[3]
D[3]
3
3
3
D[10]
D[10]
D[2]
D[2]
D[2]
Single-Chip SDSL/HDSL Transceiver
2
2
2
D[1]
D[9]
D[1]
D[9]
D[1]
1
1
1
N8973DSD
RS8973
D[0]
D[8]
D[0]
D[8]
D[0]
0
0
0