IBM DTLA-305040 Hard Drive Specifications - Page 89
Diagnostic and reset considerations, Power On Reset, Hard Reset, Soft Reset, Execute Device Diagnostic
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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. Hard Reset, 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 EXECUTE DEVICE DIAGNOSTIC 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 as shown in the figure below. Device 1 present? Yes Yes Yes Yes No No PDIAG- Asserted? Yes Yes No No (not read) (not read) Device 0 Passed Yes No Yes No Yes No Error Register 01h 0xh 81h 8xh 01h 0xh 'x' indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft Reset, or Device Diagnostic error. Figure 76. Reset error register values Deskstar 40GV & 75GXP hard disk drive specifications 77
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