ST70136B STMICROELECTRONICS [STMicroelectronics], ST70136B Datasheet - Page 9

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

Figure 2 : Digital Data Interface
4.7 - Control Serial Interface
There is a 4-pin serial digital interface (CLKWD,
CTRLIN, CTRLOUT, R/W) that access one of the
8 x 12-bit registers that controls all the program-
mable features on the ST70136.
The registers are loaded with the asynchronous
type data burst delivered to CTRLIN pin. It is com-
Figure 3 : Control Register Interface Write Cycle
CLKM
CLKWD
CTRLIN
CTRLOUT
R/NW
CLKM
35.328MHz
CLKWD
8.832MHz
TX[0]/RX[0]
TX[1]/RX[1]
TX[2]/RX[2]
TX[3]/RX[3]
TX DATA
RX DATA
b15
a0
a1
a2
a3
Data for write access [b14:b3]
a15
Sign
a15
Sign
a4
a5
a6
a7
Sign DATA.................................................................... 0
a14
DATA..................................................................................LSB
a14
a10
a11
a8
a9
a13
a13
a12
a13
a14
a15
posed of 16 bits from which the first bit (b15) is
used as start bit (‘0’), the three LSBs (b2:b0) being
used to identify the register to be loaded.
The twelve remaining bits (b14:b3) are the control
data. During a read operation, the CTRLOUT pin
figures out the register contents addressed by
CTRLIN pin.
[b2:b0]
a2
a1
0 0
a0
a0
ST70136
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