Corp. SpaceWire Router User Manual

Ref.:
UoD_SpW-10X_
UserManual
Issue:
3.4
SpW-10X
SpaceWire Router
User Manual
Date:
11
th
July 2008
Preliminary
134
SpaceWire port to SpaceWire port
Last bit of data into receiver to last bit of data out of transmitter (Worst case where transmitter is
sending a time-code and FCT character before data)
()( )
(
)
TXPERIODSYSPERIODRXPERIODSSDATA TTTT
×
+
×
+
×= 2385
SpaceWire port to External port
Last bit of data into receiver to external port not empty flag
()( )
SYSPERIODRXPERIODSEDATA TTT ×
+
×= 85
External port to SpaceWire port
External port write enable to last bit of data out of transmitter (Worst case where transmitter is sending
a time-code and FCT character before data)
()( )
TXPERIODSYSPERIODESDATA TTT ×
+
×= 234
External port to External port
External port write enable to external port not empty flag.
()
SYSPERIODEEDATA TT ×= 5
10.6.4 Time-code Latency
The maximum time taken to propagate a time code through a routing switch
SpaceWire port to SpaceWire port
Last bit of time-code into receiver to last bit of time-code out of transmitter (worst case where
transmitter has started sending a before time-code data character)
()
(
)
(
)
TXPERIODSYSPERIODRXPERIODSSTC TTTT
×
+
×+×= 1665
SpaceWire port to External port
Last bit of time-code into receiver to external port EXT_TICK_OUT rising edge
()
(
)
SYSPERIODRXPERIODSETC TTT ×+×= 85
External port to SpaceWire port
EXT_TICK_IN rising edge to last bit of time-code out of transmitter (worst case where transmitter has
started sending a before time-code data character)
()
(
)
TXPERIODSYSPERIODESTC TTT ×+×= 166