Table 4.5.4 Access States - Fujitsu M2361A Customer Engineering Manual

b. Access Time-Out Check (Status 1)
During an RTZ or Seek operation, On Cylinder failed to appear within
250 ms +30% after Access Start. It can be cleared by RTZ operation.
c. Over-Shoot Check (Status 2)
Indicates the heads go past the desired track during Seek or RTZ
operation or go into the Guard Band or
10
Position during a Seek
operation.
It also indicates that the heads are moving at abnormal speed during
RTZ operation.
Over-Shoot Check can be cleared by RTZ operation.
d. Rezero Mode Latch (Status 3)
Servo Latch (Status 4)
Linear Mode Latch (Status 5)
Control Latch (Status 6)
Wait Latch (Status 7)
The five latches observe the sequence of seek and RTZ operations.
Whenever an error occurs during seek or RTZ, the content of these
latches are frozen at that time, so that they are beneficial for
error analysis. They can be cleared by RTZ operation. The
relationship between access state and the contents of latches is
shown in Table 4.5.4.
Table 4.5.4 Access states
Rezero Mode
Servo Latch
Linear Mode
Control Latch Wait Latch State
Latch Latch
Mode
0
0
0 0 1
Wait State Reset
0 0
0 0
0 State RTZ
1 0 0 0 0
Move In
1 0
0
1 0
Turn Around
RTZ
1
0
1
1 0
Move Out
0 0 1 1 0
RTZ Linear Mode
0 1 1 1 0 On
Track
0 1 0
1
0
Accelerate
0 1
0
0 0 Decelerate
Seek
0 1
1
0 0
Seek Linear Mode
0
1 1 1 0 On
Track
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