IBM DBCA-204860 - Travelstar 4.8 GB Hard Drive, Specifications

Page: 76 / 190

10.2 Diagnostic and Reset considerations
For each Reset and Execute Device Diagnostic, the diagnostic is done as follows:
Power On Reset, Hard 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.
If Device 1 is not present, Device 0 does not Assert
DASP- at POR.
Soft 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 E XE CU T E 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 E X E CU T E DEVICE DIAGNOSTIC
command the Device 0 Error register is shown in Figure 48.
ÚÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÂÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³
D e v i c e 1
³
P D I A G
Ä ³
D e v i c e 0
³³
E r r o r
³
³
P r e s e n t ?
³
A s s e r t e d ?
³
P a s s e d
³³
R e g i s t e r
³
ÃÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÅÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
³
Y e s
³
Y e s
³
Y e s
³³
0 1 h
³
³
Y e s
³
Y e s
³
N o
³³
0 x h
³
³
Y e s
³
N o
³
Y e s
³³
8 1 h
³
³
Y e s
³
N o
³
N o
³³
8 x h
³
³
N o
³
( n o t r e a d )
³
Y e s
³³
0 1 h
³
³
N o
³
( n o t r e a d )
³
N o
³³
0 x h
³
ÀÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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 48. Reset error register values
68
O E M Specifications of DBCA-2xxxxx 2.5 inch H D D