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received and decoded correctly. Data received previous to the reset command is still forwarded to the node's working
memory.
Utilizing the interrupt signal indicating to the node CPU that an externally commanded link reset has occurred, the CPU can
then decide on invalidating data already received via this channel.
Reset Link Interface Unit HW
Provided that safety critical command execution has been enabled, the execution of this command is performed immediately
after correct reception of the command and the EOP marker. Due to the immediate execution, no acknowledge packet is sent.
The command has the same results on ALL link channels integrated on one chip as the "reset link interface HW" command
described above with the exception of the reception path of the memory interface.
The reception path of all link channel interfaces are reset in the same way as it is the case for the transmission path:
-
clearing of all configuration registers
-
clearing of all intermediated storage, marking FIFOs as empty
13.4.5
Shutdown Link Channel Operation / Restart Link Channel Operation
During link shutdown, basically the same actions are performed as for the 'reset link interface unit HW' command. It is up to
the implementation to assure that no currently running traffic is disturbed by a link shutdown.
The 'restart link channel operation' complex command initiates a link frontend restart just like a restart from a simple 'reset
link interface' command.
13.4.6
Read of Link Interface Status Register
If the link channel status register is read via the link, the content of the register must be kept constant during the read
operation. Change of the link channel status register during a read operation is not allowed.
Some entries in the status register are transient in the sense that they are reset after a read. This holds especially for some
error information which is regarded as invalid when it has been read. Details are given in para. 5.
SMCS332SpW
User Manual
– All Rights Reserved – Copyright per DIN 34 –
EADS Astrium GmbH, ASE2
Doc No: SMCS_ASTD_UM_100
Issue:
1.4
Updated: 9-Sep-2006
Page:
121 of 131
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