Specifications

Key to power-on and reset timing data

Label Time

25 µsec

TN 400 nsec*

TP 1 msec*

TQ 30 seconds*

TR 450 msec for master drive*

TR 400 msec for slave drive*

TS 30.5 seconds*

Note. All timings indicate minimum times except for those marked with

an asterisk (*), which show

maximum

allowable times.

RESET–

BSY

DASP–

Control

Registers

Notes:

1. Drive 0 can set BSY=0 if Drive 1 is not present

2. Drive 0 can use DASP– to indicate it is active if Drive 1 is not present

3. DASP– can be asserted to indicate that the drive is active

BSY

PDIAG–

DASP–

Control

Registers

Drive 1

Drive 0

(1)

(2)

(3)

Figure 16. System power-on and reset timing

70 ATA Interface Reference Manual, Rev. C