Timing for data and strobe, Card present, Data – MagTek P-SERIES TTL User Manual

Page 16

P-series Insertion Reader

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.

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