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DISK DRIVE OPERATION 

 

SpinPoint V40 Product Manual

79

 

 

 
A reset is accepted within 400 nsec after the negation of RESET- or within 400 nsec after SRST has been set 
in the Device Control register. 
 
When the drive is reset by RESET-, Drive 1 indicates it is present by asserting DASP- within 400 msec, and 
DASP- remains asserted for 30 seconds or until Drive 1 accepts the first command. 
 
When the drive is reset by SRST, the drive sets BSY=1. See also Device Control register (section 6.3.3.3). 
 
When a reset is accepted, and with BSY set: 
 

a) Both drives perform hardware initialization 
b) Both drives clear any previously programmed drive parameters 
c) Both drives may revert to the default condition 
d) Both drives load the Command Block registers with their default values 
e) If it was a hardware reset, Drive 0 waits for DASP- to be asserted by Drive 1   
f) If operational, Drive 1 asserts DASP- 
g) Drive 0 waits for PDIAG- to be asserted, if Drive 1 asserts DASP- 
h) If operational, Drive 1 clears BSY 
i) If operational, Drive 1 asserts PDIAG- 
j) Drive 0 clears BSY 

 
No interrupt is generated when initialization is complete. 
 
The default values for the Command Block registers, if no self-tests are performed or if no errors occurred, 
are: 
 

Error = 

01h 

Cylinder 

Low 

= 00h 

Sector Count  

=  01h 

Cylinder High 

= 00h 

Sector Number 

=  01h 

Drive/Head 

= 00h 

 
The Error register contains a Diagnostic Code (see Table 6-3). 
Following any reset, the host should issue an Initialize Drive Parameters command to ensure the drive is 
initialized as desired. 
 
 

 
The errors that are valid for each command are defined in Table 6-13. 
See sections 6.3.4.4 and 6.3.4.10 for the definition of the Error register and Status register bits.