bt8970 Mindspeed Technologies, bt8970 Datasheet - Page 70

• Manufacturer Part Number: bt8970
• Description: Single-chip Hdsl Transceiver
• Manufacturer: Mindspeed Technologies

4.0 Register
0x79—Equalizer Write Select Register (eq_add_write)
A 6-bit read/write register representing an unsigned binary address defined over a range of 0 to 47 decimals.
When written, it causes the lowest-order 16 bits of the Access Data Register [access_data_byte[3:0];
0x7C–0x7F] to be subsequently written to the selected equalizer register file location within two symbol
periods. Does not affect the value of the access data register. An address map of the shared register file, as
defined by the factory-delivered microcode, is shown above.
0x7A—Equalizer Microcode Read Select Register (eq_microcode_add_read)
A 6-bit read/write register representing an unsigned binary address defined over a range of 0 to 63 decimals.
When written, it causes the selected 32-bit location of the equalizer microprogram store to be subsequently
loaded into the Access Data Register [access_data_byte[3:0]; 0x7C–0x7F] within two symbol periods. Does not
affect the value of the microprogram store location. No other data access may occur between the time the Read
Tap Select Register is written and the time the Access Data Register is read, or the data may be corrupted.
4-26
7
–
7
–
Decimal
16–20
21–25
35–47
8–15
0–7
26
27
28
29
30
31
32
33
34
6
6
–
–
D[5:0]
Preliminary Information/Conexant Proprietary and Confidential
00 0000–00 0111
00 1000–00 1111
01 0000–01 0100
01 0101–01 1001
10 0011–10 1111
D[5]
D[5]
01 1011
01 1100
01 1101
01 1110
10 0000
10 0001
10 0010
5
5
01 1010
01 1111
Binary
D[4]
D[4]
4
4
Conexant
FFE Coefficients 0–7
FFE Data Taps 0–7
EP Coefficients 0–4
EP Data Taps 0–4
DAGC Gain - Least-Significant Word
DAGC Gain - Most-Significant Word
DAGC Output
FFE Output
DAGC Input
FFE Output, Delayed 1 Symbol Period
DAGC Error Signal
Equalizer Error Signal
Slicer Error Signal
Reserved
D[3]
D[3]
3
3
Stored Parameter
D[2]
D[2]
2
2
Single-Chip HDSL Transceiver
D[1]
D[1]
1
1
100101B
D[0]
D[0]
Bt8970
0
0