Fujitsu MHN2100AT Manual/User Guide - Page 128
Max. cylinder [MSB]/Max. LBA
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Interface At command completion (I/O registers contents to be read) 1F7 (ST) H 1F6H(DH) 1F5H(CH) 1F4H(CL) 1F3H(SN) 1F2 (SC) H 1F1 (ER) H Status information x x x DV Max head/LBA [MSB] Max. cylinder [MSB]/Max. LBA Max. cylinder [LSB]/Max. LBA Max. sector/Max. LBA [LSB] xx Error information (18) EXECUTE DEVICE DIAGNOSTIC (X'90') This command performs an internal diagnostic test (self-diagnosis) of the device. This command usually sets the DRV bit of the Drive/Head register is to 0 (however, the DV bit is not checked). If two devices are present, both devices execute self-diagnosis. If device 1 is present: • Both devices shall execute self-diagnosis. • The device 0 waits for up to 5 seconds until device 1 asserts the PDIAGsignal. • If the device 1 does not assert the PDIAG- signal but indicates an error, the device 0 shall append X'80' to its own diagnostic status. • The device 0 clears the BSY bit of the Status register and generates an interrupt. (The device 1 does not generate an interrupt.) • A diagnostic status of the device 0 is read by the host system. When a diagnostic failure of the device 1 is detected, the host system can read a status of the device 1 by setting the DV bit (selecting the device 1). When device 1 is not present: • The device 0 posts only the results of its own self-diagnosis. • The device 0 clears the BSY bit of the Status register, and generates an interrupt. Table 5.6 lists the diagnostic code written in the Error register which is 8-bit code. If the device 1 fails the self-diagnosis, the device 0 "ORs" X'80' with its own status and sets that code to the Error register. 5-52 C141-E120-02EN