SPI Mode 3 Timing
High-speed peripheral interfaces rely on precise clock polarity and phase configurations to synchronize data transfers. SPI Mode 3 provides a robust timing scheme where the clock line remains high during idle states.
Construct a circuit that generates the sck and mosi signals for an SPI Mode 3 interface. The system provides a free-running clk, an active-high en signal, and the next bit to transmit on tx_data.
The sck output is purely combinational and must follow this exact behavior based on the system clock and enable state:
| clk | en | sck | |-------|------|-------| | 0 | 0 | 1 | | 1 | 0 | 1 | | 0 | 1 | 1 | | 1 | 1 | 0 |
The mosi output must capture and output tx_data exactly on the falling edge of sck. Assume mosi initializes to 0.
Constraints
- Implement
sckusing only combinational logic. - Use exactly one D-Flip-Flop to drive the
mosioutput. - Do not use asynchronous reset pins on the flip-flop.
Topics
Solve this problem
Place the gates, wire them up and watch the signals settle. Every submission runs on the same simulation engine that grades it.
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