ST70136B STMICROELECTRONICS [STMicroelectronics], ST70136B Datasheet - Page 10

• Manufacturer Part Number: ST70136B
• Description: CPE ADSL ANALOG FRONT END
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST70136
Figure 4 : Control Register Interface Read cycle
4.7.1 - AFE registers
4.7.1.1 - Rx Gain Control
This register is located at the address “000” and is used to program the gain in the receive path.
Table 2 : Rx Gain Control (address [b2:b0]=”000”)
4.7.1.2 - Tx Gain Control
This register is located at the address “001” and is used to program the gain in the transmit path.
Table 3 : Tx Gain Control (address [b2:b0]=”001”)
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GC[1:0]
Other
RxAGC
RxAtt
Other
TxAGC
Other
CLKM
CLKWD
CTRLIN
CTRLOUT
R/NW
Name
Name
b15
14..11
Pos.
10..3
14.13
Pos.
11..7
6..5
4.3
12
Don’t care
Type
R/W
R/W
Type
R/W
R/W
R/W
R/W
R/W
0000
00000
Def.
0..0
Def.
00
00
00
0
Select internal gain for Transmit amplifier
Reserved
[b2:b0]
GC1
GC0
Reserved
Select internal gain for Receive amplifier
Receive attenuator
Reserved
b15
Description
Description
0000 : -15dB
1111 : 0dB
bit14: selects External Gain Control
bit13: selects External Gain control
00000 : 0dB
11111 : 31dB
00 = 0dB
01 = -4dB
10 = -8dB
11 = -12dB
Data [b14:b3]