Data bus driver having first and second operating modes for coupling data to the bus at first and second rates
AssigneeThomson Licensing
InventorsJuri Tults, William John Testin
Life of this patent
Estimating the term…
Abstract
Information is coupled to a data bus such as an I2C data bus using a push-pull circuit. The push-pull circuit provides for communicating on the data bus at two different data rates. The push-pull circuit includes an active pull-up device that is enabled during a first push-pull mode of operation for providing a high data rate. During a second normal mode of operation, the active pull-up device is disabled providing a low data rate. When the active pull-up device is deactivated, the clock and data buses are driven by the external resistors connected thereto at a data rate lower than the data rate during the first mode.
Claims10
An apparatus for controlling data transmission on a data bus, said apparatus comprising:
- a passive device coupled to the data bus for establishing a first operating mode during which data signals are transmitted on the data bus at a first rate;
- and
- an active device coupled to the data bus and capable of operating in one of an enabled mode and a disabled mode, said active device in said enabled mode establishing a second operating mode during which signals are transmitted on the data bus at a second rate, said first rate being different from said second rate.
A television signal processing system including an apparatus for controlling data transmission on a data bus, said apparatus comprising:
- a passive device coupled to the data bus for establishing a first operating mode during which data signals are transmitted on the data bus at a first rate;
- and
- an active device coupled to the data bus and capable of operating in one of an enabled mode and a disabled mode in response to a control signal, said active device in said enabled mode establishing a second operating mode during which signals are transmitted on the data bus at a second rate, said first rate being different from said second rate, wherein said first operating mode occurs during an interval corresponding to a first portion of a television signal representing video information and said second operating mode occurs during an interval corresponding to a second portion of the television signal representing information other than video information.
Dependencies are inferred from the claim text.