Atmel SpaceWire Router SpW-10X - Manual (Page 40)

Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual Date: 11 th
July 2008
Preliminary
40
should be pulled down (e.g. 4k7 Ω).
166
165
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161
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159
EXT_TIME_IN(7)
EXT_TIME_IN(6)
EXT_TIME_IN(5)
EXT_TIME_IN(4)
EXT_TIME_IN(3)
EXT_TIME_IN(2)
EXT_TIME_IN(1)
EXT_TIME_IN(0)
In EXT_TIME_IN(7:0) provides the value of the time-
code to be distributed by the router when an
external time-code source is selected i.e. when
SEL_EXT_TIME is high on the rising edge of
EXT_TICK_IN.
When SEL_EXT_TIME is high on the rising edge of
EXT_TICK_IN the value of the time-code counter is
used for bits 5:0 of the time-code and bits 7:6 of the
EXT_TIME_IN(7:0) are used for the two control
signals, bits 7:6 of the time-code.
If the time-code port is not being used these inputs
should be pulled down (e.g. 4k7
Ω).
CMOS3V3
167 SEL_EXT_TIME In If SEL_EXT_TIME is high on the rising edge of
EXT_TICK_IN the value on EXT_TIME_IN(7:0) is
loaded into the internal time-code register and
propagated by the router.
If SEL_EXT_TIME is low on the rising edge of
EXT_TICK_IN the value to be sent in the time-code
will be taken from the internal time-code counter in
the router. The two control-bits (bits 7:6) of the
time-code will come from bits 7:6 of the
EXT_TIME_IN(7:0) input.
If the time-code port is not being used this input
should be pulled down (e.g. 4k7
Ω).
CMOS3V3
168 TIME_CTR_RST In This signal causes the internal time-code counter to
be reset to zero.
The timing parameters used for EXT_TICK_IN also
apply to the time-code counter reset signal
(TIME_CTR_RST).
If the time-code port is not being used this input
should be pulled down (e.g. 4k7
Ω).
CMOS3V3
169 EXT_TICK_OUT Out The falling edge of EXT_TICK_OUT is used to
indicated the reception of a time-code. The value of
this time-code is place on the EXT_TIME_OUT(7:0)
outputs and is valid on the rising edge of
EXT_TICK_OUT .
CMOS3V3
179
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176
173 EXT_TIME_OUT(7)
EXT_TIME_OUT(6)
EXT_TIME_OUT(5)
EXT_TIME_OUT(4)
EXT_TIME_OUT(3) Out Received time-code value which is valid when
EXT_TICK_OUT is asserted.
The value of a received time-code is output on the
CMOS3V3