Check the modified blocks with a test-bench. If the receiver de-asserts this line, the transmitter will keep (freeze) the last bit sent on the line, until the ‘receiver ready’ signal is asserted again. Same as 1, but now the ‘receiver ready’ line serves as a flow control line.Modify both blocks and test them with a modified test-bench. The Parallel to serial converter will sample this line and will start a new transmission only if this line is asserted. Add a ‘receiver ready’ line, as an output from the Serial to parallel converter.
On the waveform below it can be seen the transmitted data and the received data by the ser2par module.Īll the source files for this simulation can be found here. The received data is available in parallel format on the data_outbus.įor the simulation, the Parallel to serial converter is used to generate data and the ser2par receives the data. The selection codes for the multiplexer are generated by a 3-bit. Parallel data from the data in or some other register is applied to the 8 input lines of the multiplexer.
The figure below shows the parallel to serial data conversion using an 8 input multiplexer.
If a frame_insignal is detected, the data is latched in and the data_rdyoutput is asserted until the rdinput is asserted by the host. In such cases, parallel data is converted into serial form using multiplexers. This VHDL module receives serial data from the data_inline.
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