Altera Corporation
11–17
May 2007
Stratix II Device Handbook, Volume 2
High-Speed Board Layout Guidelines
Figure 11–19. Star Routing
Serpentine Routing
When a design requires equal-length traces between the source and
multiple loads, you can bend some traces to match trace lengths (see
Figure 11–20). However, improper trace bending affects signal integrity
and propagation delay. To minimize crosstalk, ensure that S 3 H,
where S is the spacing between the parallel sections and H is the height of
Device 1
Clock
Source
Main Bus
Device 2
Termination
Resistor
Device 3
Device Pin
(BGA Ball)