Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1995-10-16
1997-01-14
Hudspeth, David R.
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 38, 326 93, H03K 19177
Patent
active
055943675
ABSTRACT:
A input/output circuit (IOB) within an integrated circuit (IC) device, the output signal driving circuitry of the input/output device contains a dedicated multiplexer on the output path wherein a first and second output signal can be time multiplexed on a single output pad. The multiplexer can also be configured to perform as a high speed gate to realize AND, OR, XOR, and XNOR functions. Within an input/output circuit of a programmable integrated circuit, the system provides a dedicated multiplexer that can select between one of two output signals for sending over the single output pad of the IC device. In lieu of using a programmable memory cell as the select control for the dedicated multiplexer, the system allows a number of lines, including an output clock signal, to be the select control. By using the output clock as the select control, the data signals can be effectively time multiplexed over a single output pad and referenced by the output clock. This effectively doubles the number of output signals the IC device can provide with a given number of pads. The dedicated multiplexer when configured as a high speed gate is useful for generating very high speed system level reset or enable signals or any logic function.
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Babb, Jonathan; Tessier, Russell; and Agarwal, Anant, "Virtual Wires: Overcoming Pin Limitations in FPGA-based Logic Emulators", IEEE Workshop on FPGAs for Custom Computing Machines, FCCM 93, Apr. 5-7, 1993, pp. 1-15.
Conn, Jr. Robert O.
Duong Khue
Trimberger Stephen M.
Harms Jeanette S.
Hudspeth David R.
Murabito Anthony C.
Xilinx , Inc.
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