User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 796 of 909 2019 Ambiq Micro, Inc.
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21.21Serial Wire Debug (SWD)
Figure 102. Serial Wire Debug Timing
Table 1164: Serial Wire Debug (SWD)
Symbol Parameter Min Typ Max Unit
T
SWDCK_HI
SWDCK clock high period µs
T
SWDCK_LO
SWDCK clock low period µs
T
OS_SWD
SWDIO output skew to falling edge of SWDCLK ns
T
SU_SWD
Input setup time between SWDIO and rising edge SWDCK ns
T
HD_SWD
Input hold time between SWDIO and rising edge SWDCK ns
StartParityDataDataParkStopDebuggerProbeOutputtoSWDIO High‐Z
DebuggerProbe Output toSWDCK
AcknowledgeHigh ‐Z High‐Z
T
OS_SWD
T
SWDCK_HI
T
SWDCK_LO
ReadCycle
ApolloOutputtoSWDIO
Start
ParityDataData
ParkStopDebuggerProbeOutputtoSWDIO High‐Z
DebuggerProbe Output toSWDCK
AcknowledgeHigh ‐Z High‐Z
T
SU_SWD
T
SWDCK_LO
WriteCycle
ApolloOutputtoSWDIO