Writing data to the drive is accomplished by:
a. Activating the DRIVE SELECT line.
b. Selecting the head.
c. Activating the WRITE GATE line.
d. Pulsing the WRITE DATA line with the data to be written.
The timing specifications for the write data pulse are shown in Figure 2-8 for high
speed operation, and Figure 2-9 for low-speed operation. Write data encoding can
be FM or MFM.
3.0
Customer installable option
This section discusses examples of modifications and how to implement them.
3.1
Plug/wire jumper
The drive can be modified by the user according to the user's requirements. These
modifications can be implemented by adding, changing, or deleting connections.
These changes can be accomplished by the use of shorting plugs (please see table
3-1) or wire jumpers.
Option shorting plug: 2mm centres.
18
4.0
m
s
±
20ns
C
D
D
C
C
C
Write data
150 to 600ns
2.0
m
s
±
10ns
8.0
m
s
±
40ns
C
D
D
C
C
C
Write data
150 to 600ns
4.0
m
s
±
20ns
Figure 2-8. High-speed write data timing (FM encoding 1.6Mb)
Figure 2-9. Low-speed write data timing (FM encoding 1.0Mb)
Leaflet No. 9419 26/4/97 6:10 pm Page 18
