Table 4.6.1 Access Mode Latches - Fujitsu M2361A Customer Engineering Manual

Table 4.6.1 Access mode latches
REZERO
SERVO
LINEAR
CONTROL WAIT
MODE MODE
LATCH'
LATCH
LATCH
LATCH LATCH
Operatio~
\
/~onState
Reset 0 0
0
0 1
0 8
Wait State
0 0 0 0 0
0 0
Start RTZ
1 0 0 0 0
8 0
Move In
RTZ Operation
1 0
0
1 0
8
4
Turn Around
1
0
1
1
0
8 6
Move Out
0 0
1 1
0 0 6
RTZ Linear Mode
0 1
1 1 0 0 7 On
track
0
1 0 1 0 0 5
Accelerate
Seek Operation
0
1 0
0 0
0 1
Decelerate
0
1
1
0
0
0 3
Seek Linear Mode
0 1 1
1
0
0 7
On
track
(4) Sequence RTZ
In this mode, the head is moved from the CSS zone to cylinder 00 during
the DE Start Sequence. Figure 4.6.4 shows the timing diagram.
a. State08(WaitState)
When Power On Reset goes high, Wait Latch (WAITL) is set high.
Control Latch (CNTL). Linear Mode Latch (LNML) , Servo Latch (SRVL),
and Rezero Mode Latch (RZML) are low.
b. State 00 (Start RTZ)
When the state 2 (ST2) signal goes high in the DE Start Sequence,
Sequence Rezero (SQRZ) and Any Rezero (ANYRZ) are set high and WAITL
is set low.
c •
S tat
e
80 (M
0
vel
n )
When ANYRZ goes high, Start Rezero (STRZ) and Rezero Mode Latch
(RZML) are set high. STRZ initializes the head address register and
the cylinder address register. When RZML is set high, Rezero Mode
(RZMOD) is set high and is sent to the servo control circuit.
At this time, the servo head is located at the innermost position of
the CSS zone.
B03P-4825-0002A ... OIA
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