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I/O Model Reference 135

This I/O model can be used with an off-the-shelf infrared encoder/decoder chip

that uses the NEC IR protocol to quickly develop an infrared interface to a

Neuron Chip or Smart Transceiver. You can also use the edgelog input model for

this purpose, but your application program will likely require more code.

Timer/Counter 1

Timer/Counter 2

IO10

IO9

IO8

IO0

IO1

IO2

IO3

IO4

IO5

IO6

IO7

mux

Input

Data Stream

IO11

INPUT

(IO0 TO IO7)

TIME

START OF

io_in()

END OF

io_in()

ret

fin

win (1 BIT)

Figure 51. Infrared Input and Timing

Table 51. Infrared Input Latency Values for Series 3100 Devices

Symbol Description Minimum Typical Maximum

fin

Function call to start of input sampling — 82.2 μs —

ret

End of last valid bit to function return

max-

period

max-

period

—

win

Minimum input period width — 93 μs —

Note:

max-period

is the timeout period passed to the function at the time of the call.

Programming Considerations

For infrared input, the io_in( ) function requires, in addition to the

io-object-

name

, four arguments:

•

A pointer to a data buffer in which the series of data bits are stored

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 208 209

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