Atmel SpW-10X user manual SpaceWire Router, User Manual, Preliminary

			SpW-10X	Ref.:	UoD_SpW-10X_
		SpaceWire Router			UserManual
				Issue:	3.4
			User Manual
				Date:	11th July 2008
			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)	In		Power on reset signal which determines if the			CMOS3V3
[maps to ->			output ports automatically start up when they
POR_START_ON_REQ_N]			are the destination address of a packet.
			When asserted (low) the output port will
			automatically start on request.
			This signal is active low.
STAT_MUX_OUT(7)	In		Power on reset signal which determines if the			CMOS3V3
[maps to ->			output ports are disabled when no activity is
POR_DSBLE_ON_SILENCE_N]			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.

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.

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