MagTek MT-215 TTL SINGLE OR DUAL HEAD - Manual (Page 18)

MT-215 TTL, Single or Dual Head Insertion Reader
12
TIMING FOR DATA AND STROBE
Figure 2-6 shows the timing for Data and Strobe. The timing shown is for active data (see
Figure 2-5).
Figure 2-6. Data and Strobe Timing
Card Present at Connector
The Card Present signal is low when a recorded card is being moved across the read head. The
Card Present signal is “ANDed” with the rear sensor to ensure that Card Present will go high
when the card is fully inserted into the Reader.
NOTES
1. TIME OUT OF THE CARD PRESENT SIGNAL OCCURS WITHIN
APPROXIMATELY 150 MS FROM THE LAST STROBE TRANSITION.
2. DATA IS VALID 1.0
μS (MINIMUM) BEFORE THE NEGATIVE EDGE OF
STROBE.
3. UP TO 6 OR 7 HEAD FLUX REVERSALS ARE IGNORED FOR LOW
DENSITY CONFIGURATION AND 14 OR 15 FOR HIGH DENSITY
CONFIGURATION.
CARD PRESENT
NOTE 1
0 0 0 0 0 0
DATA
0 0
1 1 1
1 1
BIT
TIME
STROBE WIDTH
APPROXIMATELY
25-50% OF BIT TIME
NOTE 3
STROBE
NOTE 2