MagTek P-SERIES TTL - Manual (Page 16)

P-series Insertion Reader
10
TIMING FOR DATA AND STROBE
Figure 2-7 shows the timing for Data and Strobe. The timing shown is for active data (see
Figure 2-6).
Figure 2-7. Data and Strobe Timing
Card Present
The Card Present signal (used in P/N 21065114) is low when a recorded card is being moved
across the read head. The Card Present signal is gated with the back sensor to ensure that Card
Present will go high when the card is fully inserted into the Reader.
Data
The Data signal is valid while the Strobe is low. If the Data signal is high, the bit is a zero.
NOTES
1. TIME OUT OF THE CARD PRESENT SIGNAL OCCURS
APPROXIMATELY 150 MS AFTER THE LAST STROBE TRANSITION.
2. DATA IS VALID 1.0
µS (MINIMUM) BEFORE THE NEGATIVE EDGE OF
STROBE.
3. 6 OR 7 HEAD FLUX REVERSALS ARE IGNORED FOR LOW DENSITY
CONFIGURATION AND 14 OR 15 FOR HIGH DENSITY
CONFIGURATION.
0
1 1
0 0 0 0 0 ...
DATA
0 0
1 1 1
BIT
STROBE WIDTH
APPROXIMATELY
25-50% OF BIT TIME
NOTE 3
STROBE
NOTE 2
NOTE 1
INTERNAL
CARD PRESENT