AccessRunner ADSL-USB Modem Device Set Data Sheet
Table 3-13. CX20431 AFE Hardware Signal Definitions
Signal Name
Pin
I/O
I/O Type
Signal Name/Description
CLOCK INTERFACE
Clock In. Connect to 35.328 MHz voltage controlled crystal oscillator
(VCXO) output through 51 Ω.
CLKIN
11
I
It
P5200 UIC CONTROL AND CX11627 ADDP SERIAL INTERFACE
Strobe In. Strobe input for the control interface. Connect to UIC
AFE_STB.
CTRL_STRB
CTRL_IN
CTRL_OUT
WAKEUP
POR#
15
16
17
18
13
I
It
Control In. Serial digital data received from the UIC. Connect to UIC
AFE_CTRLIN.
I
It
Control Out. Serial digital data sent to the UIC. Connect to UIC
AFE_CTRLOUT.
O
O
I
Ot
Ot
It
Wakeup. Digital output for tone detection mode. Connect to UIC
AFE_WAKEUP.
Reset. Active low power-On reset. Connect to UIC AFE_RST#.
P5200 UIC CONTROL AND CX11627 ADDP SERIAL INTERFACE
Strobe. Strobe output for the data interface. The negative STROBE
edge triggers the transfer of serial transmit data on TX0 from the
ADDP to the AFE and triggers the transfer of serial receive data on
RX0 and RX1 from the AFE to the ADDP. Connect to ADDP
AFE_STRB and to UIC AFE_SCLK.
STROBE
19
O
Ot
CX11627 ADDP SERIAL INTERFACE
Receive Data. Digital receive serial data output on RX0 is transferred
to the ADDP. The negative edge of the STROBE signal from the AFE
clocks the data into the ADDP. Connect to ADDP AFE_RX00.
RX0
RX1
TX0
24
23
22
O
O
I
Ot
Ot
It
Receive Data. Digital receive serial data output on RX1 is transferred
data to the ADDP. The negative edge of the STROBE signal from the
AFE clocks the data into the ADDP. Connect to ADDP AFE_RX08.
Transmit Data. Digital transmit serial data input on TX0 is transferred
from the ADDP. The negative edge of the STROBE signal clocks the
data from the ADDP. Connect to ADDP AFE_TX00.
HYBRID INTERFACE
Receive Input Positive from Hybrid. Receive input positive from the
hybrid circuit. AC couple through 1 µF.
INP_HYBR_RX
INM_HYBR_RX
1
2
I
I
Ia
Ia
Receive Input Negative from Hybrid. Receive input negative from
the hybrid circuit. AC couple through 1 µF.
CX20441 LINE DRIVER INTERFACE
Transmit Output Positive. Transmit output positive to the LD.
Connect to LD INP_DRV.
OUTP_TX
OUTM_TX
7
8
O
O
Oa
Transmit Output Negative. Transmit output negative to the LD.
Oa
Connect to LD INM_DRV.
POWER AND GROUND
Analog Reference Voltage (+2.5V). Connect to GND through 10 µF
and 0.1 µF in parallel.
VREFP
VC
29
30
31
32
REF
REF
REF
REF
REF
REF
REF
REF
Analog Reference Voltage (+1.5V). Connect to GND through 10 µF
and 0.1 µF in parallel.
Analog Reference Voltage (+0.5V). Connect to GND through 10 µF
and 0.1 µF in parallel.
VREFM
RBIAS
Analog Current Reference. Current setting external resistor.
Connect to GND through 30 kΩ resistor (+1%).
Digital Circuits Supply. Connect to +3.3V.
DVDD
AVDD
DVSS
AVSS
21
PWR
PWR
GND
PWR
PWR
GND
Analog Circuits Supply Voltage. Connect to +3.3V through filter.
Digital Circuits Ground. Connect to GND.
5, 9
14, 25, 27
6, 10
Analog Circuit Ground. Connect to GND.
AGND
AGND
3-20
Conexant
100427B
CONEXANT [ CONEXANT SYSTEMS, INC ]
