bt8970 Mindspeed Technologies, bt8970 Datasheet - Page 68

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

4.0 Register
0x72—NEC Read Tap Select Register (nonlinear_ec_tap_select_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 14-bit coefficient of the NEC to be subsequently loaded into the
lowest-order bits of the Access Data Register [access_data_byte[3:0]; 0x7C–0x7F] within two symbol periods.
Does not affect the value of the coefficient. 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.
0x73—NEC Write Tap Select Register (nonlinear_ec_tap_select_write)
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 lowest-order 14 bits of the Access Data Register [access_data_byte[3:0];
0x7C–0x7F] to be subsequently written to the selected NEC coefficient within two symbol periods. Does not
affect the value of the access data register.
0x74—DFE Read Tap Select Register (dfe_tap_select_read)
A 7-bit read/write register representing an unsigned binary address defined over a range of 0 to 113 decimals.
When written, it causes the selected 16-bit coefficient of the DFE to be subsequently loaded into the
lowest-order bits of the Access Data Register [access_data_byte[3:0]; 0x7C–0x7F] within two symbol periods.
Does not affect the value of the coefficient. 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.
0x75—DFE Write Tap Select Register (dfe_tap_select_write)
A 7-bit read/write register representing an unsigned binary address defined over a range of 0 to 113 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 DFE coefficient within two symbol periods. Does not
affect the value of the access data register.
4-24
7
–
7
–
7
–
7
–
D[6]
D[6]
6
6
6
6
–
–
Preliminary Information/Conexant Proprietary and Confidential
D[5]
D[5]
D[5]
D[5]
5
5
5
5
D[4]
D[4]
D[4]
D[4]
4
4
4
4
Conexant
D[3]
D[3]
D[3]
D[3]
3
3
3
3
D[2]
D[2]
D[2]
D[2]
2
2
2
2
Single-Chip HDSL Transceiver
D[1]
D[1]
D[1]
D[1]
1
1
1
1
100101B
D[0]
D[0]
D[0]
D[0]
Bt8970
0
0
0
0