| Ref.: |
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SpaceWire Router |
| UserManual | |
Issue: | 3.4 | ||
User Manual | |||
Date: | 11th July 2008 | ||
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2.LVDS fail safe resistors need not be adjacent to the termination resistor. Their location is not critical but the stub lengths to the termination resistors should be less than 20 mm.
3.LVDS tracks shall be 100 ohm differential impedance.
4.Skew between the plus and minus sides of the LVDS differential pair shall be avoided and shall be less than +/- 1 mm.
5.Data and strobe track lengths shall be matched to +/- 2.5 mm to keep skew to a minimum.
6.There is no need to match input and output track lengths.
7.Vias shall only be used at the SpaceWire connector and close to the
12.2.7External Ports
The following recommendations apply to the External FIFO port signals from the
1.When the External FIFO ports are used, series termination resistors (33 ohm) should be used on each output if the tracks on the outputs are more than 4 cm in length.
2.The series termination resistors should be placed as close as possible to the output pins of the
3.Series termination resistors are also recommended on the devices driving the External FIFO port inputs if the tracks connected to the inputs are more than 4 cm in length.
4.The pull up/down resistor recommendations provided in section 5.3 should be followed.
12.2.8 Time-code Interface
The following recommendations apply to the
1.When the
2.The series termination resistors should be placed as close as possible to the output pins of the
3.Series termination resistors are also recommended on the devices driving the
4.The pull up/down resistor recommendations provided in section 5.4 should be followed.
12.2.9 Status / Power On Configuration Interface
The pull up/down resistor recommendations provided in section 5.6 should be followed for power on configuration.
Preliminary | 141 |
