Atmel SpaceWire Router SpW-10X User Manual

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

147

 

13.3.2  Data Strobe Disable Waveform 

If a SpaceWire link is disabled, either by configuration command or a disconnect, parity, escape or 
credit error, the final bit of strobe will be extended to a 100 ns period pulse. No simultaneous 
transitions or glitches can occur during a disable operation. This operation is as expected. The reset 
anomaly has no effect on link disconnect operation. 

The output waveforms during link disconnect are shown in Figure 13-5. 

 

13.3.3  Reset Anomaly Workarounds 

The reset anomaly will not cause any problem when operating with any SpaceWire compliant device 
[AD1]. 

When operating with IEEE-1355 devices like the old SMCS332 and SMCS116 devices it is 
recommended that the old devices are replaced by the new SpaceWire compliant SMCS332SpW and 
SMCS116SpW devices, which are or shortly will be available from Atmel. 

If operation with legacy units which use IEEE-1355 devices is necessary and these devices cannot be 
replaced by the new SpaceWire compliant parts, then the following reset sequence is recommended: 

1. Assert the reset for the SpW-10X device. 

2. Assert the reset for any IEEE-1355 devices attached to the SpW-10X device. 

3. Release the reset of the SpW-10X device. 

4. Wait for at least 10 µs. 

5. Release the reset of the IEEE-1355 devices. 

Alternatively when only a reset of the SpW-10 is required and an attached IEEE-1355 device is not to 
be reset at the same time, then the following reset sequence is recommended: 

1. Send configuration commands to the SpW-10X device to disable the ports attached to 
IEEE-1355 devices. 

2. Once all these ports have been disabled, wait for at least 10 µs. 

3. Assert the reset for the SpW-10X device. 

4. Release the reset of the SpW-10X device.