Altera DE1-SoC - Page 79

DE1-SoC User Manual
78
www.terasic.com
March 14, 2014
• 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
transmission time is constant.
Figure 5-14 Typical frame of NEC protocol
Note: The signal received by IR Receiver is inverted. For instance, if IR TX Controller sends a lead
code 9 ms high and then 4.5 ms low, IR Receiver will receive a 9 ms low and then 4.5 ms high lead
code.
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