ECSS‐E‐ST‐50‐12C
31July2008
5
4.8 Application programming interface...........................................................................32
5 Physical level (normative)....................................................................................33
5.1 Overview ..................................................................................................................33
5.2 Cables ......................................................................................................................33
5.2.1 Generic.......................................................................................................33
5.2.2 Inner conductors.........................................................................................34
5.2.3 Twisted pair ................................................................................................35
5.2.4 Complete cable...........................................................................................36
5.2.5 Cable physical parameters.........................................................................38
5.3 Connectors...............................................................................................................38
5.3.1 General.......................................................................................................38
5.3.2 Receptacles................................................................................................39
5.3.3 Plugs...........................................................................................................39
5.3.4 Connector contact identification .................................................................39
5.3.5 Inner shield connection...............................................................................40
5.3.6 Flying lead connectors................................................................................40
5.3.7 PCB mounting connectors..........................................................................40
5.4 Cable assembly........................................................................................................41
5.4.1 Overview.....................................................................................................41
5.4.2 Cable length ...............................................................................................41
5.4.3 Cable connections......................................................................................41
5.5 PCB and backplane tracking....................................................................................43
5.5.1 General.......................................................................................................43
5.5.2 Differential signal pairs ...............................................................................43
6 Signal level (normative) .......................................................................................44
6.1 Low voltage differential signaling (LVDS).................................................................44
6.2 Failsafe operation of LVDS ......................................................................................44
6.3 Signal coding............................................................................................................44
6.3.1 Data-strobe (DS) ........................................................................................44
6.3.2 Simultaneous transition on data and strobe signals...................................45
6.4 Differential DS ..........................................................................................................45
6.5 SpaceWire link .........................................................................................................46
6.6 Data signalling rate...................................................................................................46
6.6.1 Minimum data signalling rate......................................................................46
6.6.2 Maximum data signalling rate.....................................................................46
6.6.3 Operational data signalling rate..................................................................46
6.6.4 Effects of skew and jitter.............................................................................46
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