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AN3317 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3317
Description  PCB guidelines for SPEAr1340
Download  22 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3317 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3317
2/22
Doc ID 18249 Rev 2
Contents
1
Power integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
PCB layer stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Via padstack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1
Part orientation and placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Ground and power supply connections . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
DDR memory interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1
DRAM power decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2
Signal routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3
Trace length matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.4
Return path integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.5
Vref routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.6
Observability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6
USB routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1
USB decoupling and reference resistor . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7
TDR test traces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8
Layer order check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix A
Low-inductance capacitor layout in high-frequency applications 19
A.1
0402 package compact land pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
A.2
0402 package low inductance layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21


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