2.0
Electrical interface
The following section provides the electrical definition for each line. Figure 2-1
shows all of the interface connections with respect to the host system.
The signal interface consists of the following two categories:
a. Control lines.
b. Data transfer lines.
7
In use/spare (option)
Step
Direction Select
Drive select (4 lines)
Track 0
Index
Motor on
Side select
Ready/drive status
Mode select
Write data
Write gate
Write protect
Read data
Write
logic
Read
logic
Control
logic
Index
In use LED
Index
detector
Stepping
motor
¯1
¯1
¯2
¯2
Track 0
detector
Track 0
Media
detector
Write
protect
detector
Write
protect
Write head 0
Write head 1
Drive
Motor
Read/write
head
assembly
Read head 0
Read head 1
Frequency
generator
Motor
control
Motor
driver
Low/high speed
Motor on
Figure 1-2. Functional diagram
Leaflet No. 9419 26/4/97 6:09 pm Page 7
