Spw-10x spacewire router – Atmel SpaceWire Router SpW-10X User Manual
Page 44
Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual
Date: 11
th
July 2008
Preliminary
44
up.
‘1’ => Timeout period is ~ 60-80 us.
‘0’ => Timeout period is ~ 1.3 ms.
Timeout Period is:
‘1’ => 200x(2^2)x(10 MHz clk period)
‘0’ => 200x(2^16)x(10 MHz clk period)
An external pull down resistor (e.g. 4k7
Ω) is
recommended on this pin to provide the
longer timeout interval.
STAT_MUX_OUT(6)
[maps to ->
POR_START_ON_REQ_N]
In
Power on reset signal which determines if the
output ports automatically start up when they
are the destination address of a packet.
When asserted (low) the output port will
automatically start on request.
This signal is active low.
CMOS3V3
STAT_MUX_OUT(7)
[maps to ->
POR_DSBLE_ON_SILENCE_N]
In
Power on reset signal which determines if the
output ports are disabled when no activity is
detected on an output port for the current
timeout period.
When asserted (low) an output port is
disabled when it has not sent any information
for longer than the current timeout period.
This signal is active low.
CMOS3V3
WARNING
In most onboard applications it is recommended to have Stat_mux_out(4) pulled low by default in
order to enable the watchdog timers on reset.
WARNING
When the watchdog timers are not enabled the SpaceWire and external ports can block indefinitely if,
for example, a source stops sending data in the middle of a packet. If watchdog timers are not enabled
then it must be possible for a network manager to detect blocking situations and to reset the router or
node creating the problem.