Atmel SpaceWire Router SpW-10X User Manual

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

143

 

In this section a list of anomalies and warnings is provided: 

13.1 ANOMALIES 

The following anomalies are present in the prototype SpW-10X router device: 

1. Simultaneous transitions on data and strobe can occur during reset and power up. This may be a 
problem when operating with legacy IEEE-1355 devices but is not a problem when operating with 
SpaceWire compliant devices. See section 13.3for further details on this anomaly. 

2. When a parity error in a data character the following characters may be received before the link 
disconnects. 

13.2 WARNINGS 

Various warnings appear in boxes throughout this document. They are all gathered in this section for 
convenience.  

Simultaneous data/strobe transitions can occur during reset and power up. This is not a problem when 
connected to SpaceWire compliant devices but is a problem when connected to IEEE-1355 devices. 

 

Since LVDS is based on a current loop it should not matter what the supply voltage is to an LVDS 
device connected to the SpW-10X router. However, there is a potential problem when connecting to 
devices with power supplies greater than 3.3 V, which is the supply voltage of the SpW-10X device. It 
should be emphasised that during normal operation there is no problem, but if the LVDS device 
connected to the SpW-10X device can fail in such a way as to put a higher voltage than 3.3 V on to 
the pins of the SpW-10X device then this can cause a problem. The simplest way to overcome this 
potential problem is to ensure that the LVDS devices driving the SpW-10X device are all powered by 
3.3V.