Hitachi HDS728080PLAT20 Specifications - Page 87
Diagnostic and Reset considerations
UPC - 829686000094
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10.3 Diagnostic and Reset considerations For each Reset and Execute Device Diagnostic, the diagnostic is done as follows: Power On Reset Hard Reset, Soft Reset Execute Device Diagnostic 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 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. 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 that the device is active. In each case - Power On Reset [Hard Reset], Soft Reset, and the Execute Device Diagnostic command - the Device 0 Error register value is interpreted using the table below. Table 64: Reset error register values 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 The "x" indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft Reset, or Device Diagnostic error. Deskstar 7K80 Hard Disk Drive Specification 83