| 摘要 |
In a programmable logic device having I/O blocks (15) and logic blocks (13), two lines (14, 16 ) leading from a region including a logic block and an I/O block alternately provide a logic block output signal (LB-FBK) and its complement or a logic block output signal and an I/O block input signal (I/O-FBK). A multiplexer (22) selects between providing on a line (23) leading from an I/O block (15) to an interconnect structure (11) a first signal which is provided by the I/O block when the I/O block is an input buffer and a second signal which is the inverse of a logic signal provided to the I/O block when the I/O block is not an input buffer. Thus, in one case two lines which extend from the I/O block to the interconnect structure may carry a logic block output signal and an I/O block output signal, and in the other case carry a logic block output signal and the inverse of the logic block output signal. |
