cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 163

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
3.8.1 Data Transfer on the Serial Interface Bus
100381B
3.8 Serial Interface
Figure 3-16
SIC (Serial Interface Clock) to be used when programming the internal registers
via the Serial Interface bus. If the bus is not being used, both SID and SIC lines
must be left high.
by an acknowledge bit, which is generated by the receiving device. Each data
transfer is initiated with a start condition and ended with a stop condition. The
first byte after a start condition is always the slave device address byte. If this is
the device’s own address, the device will generate an acknowledge by pulling the
SID line low during the ninth clock pulse, then accept the data in subsequent
bytes (auto-incrementing the subaddress) until another stop condition is detected.
addressed device; low = write to the addressed device). Data bytes are always
acknowledged during the ninth clock pulse by the addressed device.
NOTE:
condition at any time. When this happens, the CX25870/871 will remain in the
state defined by the last complete data byte transmitted and any master
acknowledge subsequent to reading the chip ID (subaddress 0x89 if ALTADDR
pin is 0) is ignored.
Every byte put onto the SID line should be 8 bits long (MSB first), followed
The eighth bit of the address byte is the read/write bit (high = read from
Premature termination of the data transfer is allowed by generating a stop
The maximum serial interface speed for the CX25870/871 is 400 kHz.
During the acknowledge period, the transmitting device must leave the SID
line high.
illustrates the relationship between SID (Serial Interface Data) and
Conexant
3.0 PC Board Considerations
3.8 Serial Interface
3-33