Disk Drive Interface
FLAT RIBBON OR
TWISTED PAIR (3 METERS MAX)
CONTROLLER
_________ DRIVE
-D R IV E SELECTED
1
n
-C O M M A N D COMPLETE
3
4
A
' -A D D R E S S MARK ENABLE
-R E S E R V E D FOR STEP MODE
A
+ WRITE CLOCK
7
8
9
-W R IT E CLOCK
r
-R E S E R V E D FOR STEP MODE
A
+ READ/REFERENCE CLOCK
10
11
* - READ/REFERENCE CLOCK
+ NRZ WRITE DATA
13
14
1 5 ' '
- NRZ WRITE DATA
1 6 ' !
+ NRZ READ DATA
17
18
1Q .,
* - NRZ READ DATA
-IN D E X
A
MUST BE AT A LOGIC ZERO LEVEL
MD2103-0783
Figure 7-5.
ESDI Data Pin/Signal Assignments
(Connectors J2 and J3)
Table 7-5. Data Cable Pin Assignments
Pin
Signal Name
Input/Output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
-DRIVE SELECTED
GND
-COMMAND COMPLETE
-ADDRESS MARK ENABLE
GND
GND
+WRITE CLOCK
-WRITE CLOCK
GND
+READ REFERENCE CLOCK
-READ REFERENCE CLOCK
GND
+NRZ WRITE DATA
-NRZ WRITE DATA
GND
GND
+NRZ READ DATA
-NRZ READ DATA
GND
GND
Input
Input
Output
Output
Output
Input
Input
Output
Output
Input
Input
Interfaces 7-17
Summary of Contents for MD21/S2
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