Back to results
US 7,609,087 B1Granted
Integrated circuit device programming with partial power
AssigneeXilinx, Inc.
InventorConrad A. Theron
Life of this patent
Estimating the term…
Abstract
A separate program power input is provided to a programmable logic array's memory to permit it to be programmed independently of printed circuit board power. Means are provided to isolate the program power input from the array's programmable logic circuit. Means are further provided to isolate the memory from the programmable logic circuit. The program power is not connected directly or indirectly to the programmable logic circuit thereby permitting the use of low-power devices to program the memory without connecting the printed circuit board to a power supply.
Claims9
A system, comprising:
- a printed circuit board;
- and
- a plurality of programmable devices, a first subset of the programmable devices configured for functioning in one of a board power supply mode and a separate program voltage mode, a second subset of the programmable devices configured for functioning in the board power supply mode and not configured for functioning in the separate program voltage mode,
- wherein the plurality of devices are mounted on the printed circuit board;
- and
- wherein for a test signal output from a first programmable device in the first subset and input to a second programmable device in the second subset, the second programmable device is configured to pass the test signal to an output pin of the second programmable device in response to the first programmable device functioning in the program voltage mode.
3 more elements
A system, comprising:
- a printed circuit board;
- and
- a plurality of programmable devices, a first subset of the programmable devices configured for functioning in one of a board power supply mode and a separate program voltage mode, a second subset of the programmable devices configured for functioning in the board power supply mode and not configured for functioning in the separate program voltage mode, the second portion of the programmable devices being isolated during presence of the separate program voltage mode,
- wherein the plurality of devices are mounted on the printed circuit board;
- and
- wherein for a first programmable device in the first subset coupled to provide an input signal to a second programmable device in the second subset, the second programmable device is isolated from the first programmable device in response to the first programmable device functioning in the program voltage mode.
3 more elements
Dependencies are inferred from the claim text.