FUJITSU MPB3052AT - Manual (Page 160)

C141-E045-02EN 6 - 5
6.1.4 Response to diagnostic command
When the master device receives an EXECUTE DEVICE DIAGNOSTIC command and the
slave device is present, the master device checks the PDIAG- signal for up to 6 seconds to see
if the slave device has completed the self-diagnosis successfully.
The master device does not check the DASP- signal.
After the slave device receives the EXECUTE DEVICE DIAGNOSTIC command, it shall
report the result of the self-diagnostics to the master device as described below:
PDIAG- signal: negated within 1 ms and asserted within 5 seconds
When the IDD is set to a slave device, the IDD asserts the DASP- signal when negating the
PDIAG- signal, and negates the DASP- signal when asserting the PDIAG- signal.
Max. 6 sec.
Max. 5 sec.
Max. 1 ms.
If the slave device is preset, DASP- signal is checked for up to
6 seconds.
DASP-
PDIAG-
BSY bit
X'1F7' Reg.
Write
Status Reg.
BSY bit
Slave device
Master device
Figure 6.4 Response to diagnostic command