Fujitsu MPG3XXXAH manual Response to power-on

6.1.1Response to power-on

After the master device (device 0) releases its own power-on reset state, the master device shall check a DASP- signal for up to 450 ms to confirm presence of a slave device (device 1). The master device recognizes presence of the slave device when it confirms assertion of the DASP- signal. Then, the master device checks a PDIAG- signal to see if the slave device has successfully completed the power-on diagnostics.

If the master device cannot confirm assertion of the DASP- signal within 450 ms, the master device recognizes that no slave device is connected.

After the slave device (device 1) releases its own power-on reset state, the slave device shall report its presence and the result of power-on diagnostics to the master device as described below:

DASP- signal: Asserted within 400 ms, and negated after the first command is received from the host or within 31 seconds or after executing software reset, which ever comes first.

PDIAG- signal: Negated within 1 ms and asserted within 30 seconds, then negated within 31 seconds.

	Power on
Master device
Power On Reset-
Status Reg.
BSY bit			Max. 31 sec.
		Checks DASP- for up to	If presence of a slave device is
		450 ms.	confirmed, PDIAG- is checked for
			up to 31 seconds.

Slave device

Power On Reset-

BSY bit

Max. 1 ms.

PDIAG-

Max. 30 sec.

DASP-

Max. 400 ms.

Max. 31 sec.

Figure 6.1 Response to power-on

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