SpaceWire Physical Layer Tester - testing all levels of the SpaceWire Specification 578.54 KB
STAR-Dundee have previously reported on test equipment which is capable of testing the Network, Packet, Exchange, Character and parts of the Signal level of the SpaceWire standard. This paper introduces the SpaceWire Physical Layer Tester (SPLT), which is a new tool designed to test, validate and verify a SpaceWire system across all levels covered by the SpaceWire standard.
Two SpaceWire ports on the SPLT employ a special LVDS interface which allows the transmitted signals to be deliberately and measurably manipulated to test the capability of a unit under test (UUT) to receive signals of varying quality. The SPLT SpaceWire drivers offer full, independent control of voltage offset and amplitude for data and strobe pairs. Skew can be introduced both in-pair and between data-strobe pairs. Slew rates can be individually configured on each half of the differential pairs. To facilitate acquisition of an eye-diagram, the signal received on the termination resistors on these ports is buffered on external connectors to allow easy interfacing to an oscilloscope. This allows a comprehensive suite of tests to be performed through the UUT SpaceWire port without the need to open the unit.
In addition to the LVDS interface, the SPLT also implements many of the capabilities of existing STAR-Dundee devices: Link Analyser Mk2, Conformance Tester and USB Brick in addition to the packet generator and checker capabilities of the newly announced SpaceWire EGSE. A pair of Gigabit Ethernet ports and a USB 2.0 port in addition to an API allow for great flexibility in interfacing the SPLT to existing test environments. The device is rack mountable in a 1U, half width format.