Toshiba 4006GAH ユーザーズマニュアル

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10.4.6 Reset Timing 
t
M
t
N
BUSY
- RESET
 
 
 
Symbol Meaning 
Minimum
Maximum
Unit Condition 
t
M
 
RESET pulse width (Low) 
25 
 
µs   
t
N
 
RESET inactive to BSY active 
 
400 
ns   
 
10.5 Grounding 
 
HDA (Head Disk Assembly) and DC ground(ground pins on interface) are connected electrically each other.