CN8223
3.0 Registers
ATM Transmitter/Receiver with UTOPIA Interface
3.3 Configuration Control Registers
Use the following steps to initialize the CN8223 for proper UTOPIA port operation:
1. Put RS8234 in the global reset: write 0x40000000 to CONFIG0.
2. Write RS8234’s CONFIG0 to appropriate values, but do not overwrite the
GLOBAL_RESET bit.
3. Put CN8223 in the reset mode: write 0x0080 to CONFIG_5.
4. Initialize CN8223, including UTOPIA interface if needed.
5. Release CN8223 reset: write 0x0000 to CONFIG_5.
6. Release RS8234 reset: set GLOBAL_RESET bit to 0.
7. Enable RS8234’s Reassembly coprocessor.
8. Enable CN8223’s Receiver: write 0x0C02 to CELL_VAL register.
9. Enable RS8234’s Segmentation coprocessor.
0x2C—UTOPIA_2 (Utopia Port Control Register 2)
The UTOPIA_2 register is located at address 0x2C and controls operation of the UTOPIA interface.
Field
Size
Bit
Name
Description
15–6
5–0
10
Reserved
Reserved
Set to 0.
6
Set to 35 hex.
100046C
Conexant
3-13
CONEXANT [ CONEXANT SYSTEMS, INC ]
