cx25840 Conexant Systems, Inc., cx25840 Datasheet - Page 105

• Manufacturer Part Number: cx25840
• Description: Video Decoder And Broadcast Audio
• Manufacturer: Conexant Systems, Inc.

CX25840/1/2/3 Data Sheet
Table 3-37. Reset Configurations
102284B
8/3/05
IR_TX/PRGM6
(10)
IRQ_N/PRGM4
(8)
Pin
Select the VIP Host port as the default serial interface. Otherwise, the chip will respond to two-wire serial port
transactions.
If IR_TX/PRGM6 is pulled high, selects serial address for the two-wire serial interface. If IR_TX/PRGM6 is pulled
low, the serial address for the two-wire serial interface is a Don’t Care.
If the part is put into sleep mode, disable the embedded microcontroller by writing
0x00 to the Download Control (0x803) register, muting the audio described in step
10a, then sleep. To come out of sleep mode repeat the entire process above starting
from step 2 (disabling the microcontroller) and do not include step 5 (downloading the
audio firmware).
10.
11.
IR_TX/PRGM6
Initialize audio decoder
a.
b.
Program the embedded microcontroller audio auto-detection to the desired
settings as outlined in
various types of auto-detection features available, refer to
“Programming the Embedded Microcontroller”.
Pin 8
Set register Mute Control (0x8D3) to 0x1F.
Set register Path2 Balance (0x8E3) to 0x03.
– Toggle START_MICROCNTL in the Download Control (0x803) register.
1
1
1
1
This improves NICAM detection in Europe.
Usage After Reset (when pulled down)
IRQ_N/PRGM4
Conexant
Pin 10
Section
1
1
0
0
3.26, “Quick Start Audio”. For more detail on the
CHIP_SEL/VIPCLK
Pin 17
0
1
0
1
Write/Read Device
Address Pair
Section
Detailed Functional Description
0x8C/0x8D
0x88/0x89
0x8A/0x8B
0x8E/0x8F
3.23.2,
3-79