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DE10-Standard
User Manual
79
www.terasic.com
January 19, 2017
with NEC IR transmission protocol and send it out through the IR emitter LED. The IR receiver
will decode the received data and display it on the six HEXs. Users can also use a remote control to
send data to the IR Receiver. The main function of IR TX /RX controller and IR remote control in
this demonstration is described in the following sections.
IR TX Controller
Users can input 8-bit address and 8-bit command into the IR TX Controller. The IR TX Controller will
encode the address and command first before sending it out according to NEC IR transmission protocol
through the IR emitter LED. The input clock of IR TX Controller should be 50MHz.
The NEC IR transmission protocol uses pulse distance to encode the message bits. Each pulse burst is
562.5µs in length with a carrier frequency of 38kHz (26.3µs).
Figure 5-13
shows the duration of logical “1” and “0”. Logical bits are transmitted as follows:
•
Logical '0' – a 562.5µs pulse burst followed by a 562.5µs space with a total transmit time
of 1.125ms
•
Logical '1' – a 562.5µs pulse burst followed by a 1.6875ms space with a total transmit time
of 2.25ms
Figure 5-13 Duration of logical
“1”and logical “0”
Figure 5-14
shows a frame of the protocol. Protocol sends a lead code first, which is a 9ms leading
pulse burst, followed by a 4.5ms window. The second inversed data is sent to verify the accuracy of the
information received. A final 562.5µs pulse burst is sent to signify the end of message transmission.
Because the data is sent in pair (original and inverted) according to the protocol, the overall
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