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IRQ is asserted to request CIS command
by READY signal inversion
~
1. 75 11s
2. 25 11 s
A
.Figure 6-60.
Notes: 1.
0.5 11 s
B'
~
Command Rejection Timing 1
Figure 6-60 is the timing chart for 8-inch mode.
For 5-inch mode,
the periods must be doubled (2.25 11s + 4.5 11s, 1. 75 ]..ls + 3.5 ]..ls,
and 0.5 11s + 1. 0 ]..ls).
2.
A: If a command is issued during this period, the FDC rejects it.
B: If a command is issued during this period, the FDC accepts it,
but the BSY bit of the STR remains cleared.
76 HITACHI