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C141-E090-01EN 6 - 3
6.1.2 Response to hardware reset
Response to RESET- (hardware reset through the interface) is similar to the power-on reset.
Upon receipt of hardware reset, the master device checks a DASP- signal for up to 450 ms to
confirm presence of a slave device. The master device recognizes the 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 self-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 receives the hardware reset, the slave device shall report its presence
and the result of the self-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
.
Max. 31 sec.
Max. 400 ms.
Max. 31 sec.
Max. 30 sec.
Max. 1 ms.
If presence of a slave device is
confirmed, PDIAG- is checked for
up to 31 seconds.
Checks DASP- for up to
450 ms.
DASP-
PDIAG-
BSY bit
Reset-
Status Reg.
BSY bit
Slave device
Master device
Figure 6.2 Response to hardware reset