Diagnostic And Reset Considerations - IBM DTNA-22160 - Travelstar 2.1 GB Hard Drive Specifications

10.2 Diagnostic and Reset considerations

For each Reset and Execute Device Diagnostic, the diagnostic is done as follows:
Power On Reset
DASP- is read by Device 0 to determine if Device 1 is present. If Device 1 is present
Device 0 shall read PDIAG- to determine when it is valid to clear the BSY bit and
whether Device 1 has powered on or reset without error, otherwise Device 0 clears
the BSY bit whenever it is ready to accept commands. Device 0 may assert DASP-
to indicate device activity.
DASP- at POR.
Soft Reset, Hard Reset
If Device 1 is present Device 0 shall read PDIAG- to determine when it is valid to
clear the BSY bit and whether Device 1 has reset without any errors, otherwise
Device 0 shall simply reset and clear the BSY bit. DASP- is asserted by Device 0
(and Device 1 if it is present) in order to indicate device active.
Execute Device Diagnostic
If Device 1 is present, Device 0 shall read PDIAG- to determine when it is valid to
clear the BSY bit and if Device 1 passed or failed the EXECUTE DEVICE DIAG-
NOSTIC command, otherwise Device 0 shall simply execute its diagnostics and then
clear the BSY bit. DASP- is asserted by Device 0 (and Device 1 if it is present) in
order to indicate the device is active.
In all the above cases: Power on, RESET-, Soft reset, and the EXECUTE DEVICE DIAGNOSTIC
command the Device 0 Error register is shown in Figure 38.
D e v i c e 1 P D I A G
P r e s e n t ? A s s e r t e d ?
Y e s
Y e s
Y e s
Y e s
N o ( n o t r e a d )
N o ( n o t r e a d )
W h e r e x i n d i c a t e s t h e a p p r o p r i a t e D i a g n o s t i c C o d e f o r
t h e P o w e r o n , R E S E T - , S o f t r e s e t , o r D e v i c e D i a g n o s t i c
e r r o r .
Figure 38. Reset error register values
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O E M Specifications of DTNA-2xxxx 2.5 inch H D D
D e v i c e 0
P a s s e d
Y e s Y e s
Y e s N o
N o Y e s
N o N o
Y e s
N o
If Device 1 is not present, Device 0 does not Assert
E r r o r
R e g i s t e r
0 1 h
0 x h
8 1 h
8 x h
0 1 h
0 x h