Device Response To The Reset; Response To Power-On - Fujitsu MHW2040AC Product Manual

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 least 500 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 500 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 450 ms.
PDIAG- signal: Negated within 1 ms and asserted within 30 seconds.
The asserted PDIAG-signal is negated 30 seconds after it is asserted if the
command is not received.
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