B-Cable Input Signals - Fujitsu M2361A Customer Engineering Manual

(6) Busy (Dual Channel only)
If the drive has been already reserved and/or selected, a Busy signal will
be issued together with Unit Selected to the other channel attempting the
select. Busy signal will remain true until Unit Select Tag is dropped or
the Busy condition in the drive is released.
It is necessary to gate Busy signal by Unit Selected signal at the
controller.
4.5.5 B-cable input signals
(1) Write Data
Carries NRZ data which is to be written on the disk surface and must be
synchronized with Write Clock. Refer to Figure 4.5.24.
(2) Write Clock
Write Clock is a return signal of the IF Write Clock issued from the drive
as shown in Figure 4.5.8, and must be synchronized with the NRZ Write
Data.
Refer to Figure 4.5.24.
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-
- - -
-
- - -
-
- - - - - - - - -
- -
- - - - -
- - -',
I
Write
I
Servo pulse
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I
~
I
VFO
I
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I
I
..,
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I
Raw data
I
·Write
I
I
I
___________
~.:i~~
______________ }
Read clock
/f.
I
IF Write clock
/(.
1/
Write clock
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I
I
I
I
I
I
I
I
--, ,
I
I
I
-
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Figure 4.5.8 Generation of write/read clock
B03P-4825-0002A •••
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