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4.5
ESDI COMMAND CONFIGURATION AND FUNCTIONS
COMMAND DEFINITION
BITS 15·12
BITS 11 - 8
BITS 11 ·0
USED?
USED?
Seek
0
0
0
0
No
Yes
Recalibrate
0
0
0
1
No
No
Request Status
0
0
1
0
No
No
Request Configuration
0
0
1
1
Yes
No
Track Offset
0
1
0
0
-
-
Control
0
1
0
1
Yes
No
Data Strobe Offset
0
1
1
0
Yes
No
Track Offset
0
1
1
1
Yes
No
Initiate Diagnostics
1
0
0
0
No
No
Set Bytes per Sector
1
0
0
1
No
Yes
Reserved
1
0
1
0
-
-
Reserved
1
0
1
1
-
-
Reserved
1
1
0
0
-
-
Reserved
1
1
0
1
-
-
Set Configuration
1
1
1
0
Yes
Yes
Reserved
1
1
1
1
-
-
• All unused or non-applicable bits must be set to
O.
• All unimplemented or reserved commands are invalid.
• Data Strobe and Track Offset can be simultaneously enabled by sending two
separate commands.
Table 11 -
ESDI Command Configurations
COMMAND DEFINITION
BITS 15 ·12
DRIVE ACTION
Seek*
0
0
0
0
Seek to the track specified in bits 11-0
Recalibrate*
0
0
~O
1
Seek to track 00
I nitiate Diagnostics
1
0
0
0
Perform drive diagnostic test
Set Bytes per Sector
1
0
0
1
Set to binary value in bits 11 - 0
* Also resets Data Strobe offset and Track Offset
Table 12 - ESDI Command Functions
MK-1S0FA Series OEM Manual
4-4
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