Fujitsu MHN2150AT, MHN2100AT, MHN2300AT manual Device Response to the Reset, Response to power-on

Operations

6.1 Device Response to the Reset

This section describes how the PDIAG- and DASP- signals responds when the power of the IDD is turned on or the IDD receives a reset or diagnostic command.

6.1.1 Response 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.

PDIAG- signal: Negated within 1 ms and asserted within 30 seconds.

6-2 C141-E120-02EN