Echelon I/O Model Reference for Smart Transceivers and Neuron Chips - Manual (Page 99)

I/O Model Reference 89
// This next object allows monitoring of
// the ~Data_valid input signal.
IO_7 input bit ioDataValid;
int nibbles;
unsigned int buffer[20];
. . .
when (io_changes(ioDataValid) to 0) {
nibbles = io_in(ioCardData, buffer);
}
Magtrack1 Input
The magtrack1 I/O model is used to transfer synchronous serial data from an ISO
3554 track 1 magnetic stripe card reader.
See the magcard input model for track 2 compatible input, and the
magcard_bitstream input model for a general-purpose magnetic card input.
This model applies to Series 3100 Neuron Chips and Smart Transceivers, and to
Series 5000 Neuron Processors and Smart Transceivers.
Hardware Considerations
The data input is on pin IO9, and the clock, or data strobe, is presented as input
on pin IO8. The data on pin IO9 is clocked in just following the falling edge of the
clock signal on IO7, with the least-sigificant bit (LSB) first.
Serial Data
Clock
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
Timeout
CLOCK
(IO8)
SDA
(IO9)
TIMEOUT
START OF
io_in()
t
hold
END OF
io_in()
t
high
TIME
IO11
t
setup
t
low
t
clk
t
wto
t ret
t tret
t
fin
Figure 32. Magtrack1 Input and Timing