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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
The asserted PDIAG-signal is negated 5 seconds after it is asserted if the command
is not received. If the command is received, the PDIAG-signal is negated
according to timing at which the command is received.
When the IDD is set to a slave device, the IDD asserts the DASP- signal when
negating the PDIAG- signal.
Max. 6 sec.
Max. 5 sec.
Max. 1 ms.
If the slave device is preset, PDIAG- signal is checked for
up to6 seconds.
DASP-
PDIAG-
BSY bit
X'1F7' Reg.
Write
Status Reg.
BSY bit
Slave device
Master device
Figure 6.4 Response to diagnostic command
6-6 C141-E258