Echelon I/O Model Reference for Smart Transceivers and Neuron Chips - Manual (Page 96)

86 Serial I/O Models
Magcard Input
The magcard I/O model is used to transfer synchronous serial data from an ISO
7811 Track 2 magnetic stripe card reader in real time.
See the magtrack1 I/O model for track 1 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 is presented as a data signal input on pin IO9, and a clock, or a data
strobe, signal input on pin IO8. The data on pin IO9 is clocked on or just
following the falling (negative) edge of the clock signal on IO8, with the least-
significant bit (LSB) first. In addition, any one of the pins IO0 – IO7 can be used
as a timeout pin to prevent lockup in case of abnormal abort of the input bit
stream during the input process.
Up to 40 characters can be read at one time. Both the parity and the
Longitudinal Redundancy Check (LRC) are checked by the Neuron Chip or Smart
Transceiver.
Serial Data
Clock
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
CLOCK
(IO8)
TIMEOUT
DATA
(IO9)
TIME
START OF
io_in()
END OF
io_in()
Timeout
t
hold
IO11
t
high
t
setup
t
clk
t
low t
wto
t
ret
t
tret t
fin
Figure 31. Magcard Input and Timing