Rockwell SoniCrafter BT8960 - Manual (Page 76)

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3.0 Registers
3.1 Conventions
Bt8960
Single-Chip 2B1Q Transceiver
N8960DSB
3.2.52 0x4C, 0x4D—Bit Error Rate Meter Register (ber_meter_low,
ber_meter_high)
A 2-byte read-only register containing all 16 bits of the unsigned bit-error-rate 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 operating as a descrambler, the meter sim-
ply counts the number of logic ones 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-register read access.
3.2.53 0x4E—Symbol Histogram Meter Register (symbol_histogram)
A single-byte read-only register containing 8 MSBs of the 16-bit unsigned symbol histogram meter accumula-
tor. This meter counts the number of plus-one or minus-one symbols (+1, –1) detected during each Meter Timer
countdown interval. No increment occurs when a plus-three or minus-three symbol (+3, –3) is detected. The
meter register is automatically loaded at the end of each countdown interval.
3.2.54 0x50, 0x51—Noise Level Meter Register (nlm_low, nlm_high)
A 2-byte read-only register containing 16 MSBs of the 32-bit unsigned noise-level meter accumulator. This
meter sums the absolute value of the detector’s slicer-error signal over each Meter Timer countdown interval.
Automatically loaded at the end of each interval, the meter register must be read the low byte first, followed by
high byte, unseparated by any other meter-register read access.
7 6 5 4 3 2 1 0
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8]
7 6 5 4 3 2 1 0
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
7 6 5 4 3 2 1 0
D[23] D[22] D[21] D[20] D[19] D[18] D[17] D[16]
D[31] D[30] D[29] D[28] D[27] D[26] D[25] D[24]