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PEX 8680
PLX Technology PEX 8680 Manuals
Manuals and User Guides for PLX Technology PEX 8680. We have
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PLX Technology PEX 8680 manual available for free PDF download: Hardware Design Manual
PLX Technology PEX 8680 Hardware Design Manual (28 pages)
Brand:
PLX Technology
| Category:
Switch
| Size: 0 MB
Table of Contents
Preface
3
Revision History
3
Table of Contents
4
Figure 1. Sample PCI Express Link Block Diagram
7
Figure 2. Single-Ended Versus Differential Voltage
8
Transmitter
8
PCI Express Link Interface
7
Introduction
7
1 PCI Express Link Interface
8
Receiver
10
Reference Clock
10
Table 1. Receiver Equalization Settings
10
Figure 3. Transport Delay Delta
11
Figure 4. PEX 8680 Refclk Circuit
11
2 PCB Layout and Stackup Considerations
12
Channel
12
PEX 8680 BGA Routing Escape and De-Coupling Capacitor Placement
12
Figure 5. Top Layer BGA Layout and Routing Escape
13
Figure 6. Bottom Layer BGA Layout, Escape, and De-Coupling Capacitor Placement
13
Add-In Board Routing
14
System Board Routing
14
Figure 7. Add-In Card Routing to PCI Express Gold Fingers
14
Figure 8. System Board Routing to PCI Express Slot
14
Midbus Routing
15
PCB Stackup Considerations
15
Figure 9. PCI Express Midbus Routing Example
15
Figure 10. Enable NT Function with NT Strapping Balls
16
Figure 11. Disable NT Function
16
3 Non-Transparent Function
16
100 C Interface
17
Figure 12. I 2 C Interface Block Diagram
17
Hot Plug Circuitry
17
Figure 13. PHPC Circuit Block Diagram
18
Figure 14. SHPC Interface to PEX 8680 Block Diagram
19
JTAG Interface
19
5 Hot Plug Circuitry
20
Debug Functions
20
Figure 15. JTAG Interface Block Diagram
20
6 JTAG Interface
20
7 PCI Express Port Good Indicators
20
Table 2. PEX 8680 LED On/Off Patterns, by State
20
Table 3. Cross-Reference of Ball Names and Related Debug Signal Names
21
8 Debug Functions
23
9 PEX 8680 Configuration Strapping Balls
23
Table 4. Configuration Strapping Balls
23
10 GPIO Balls
24
GPIO Balls
24
11 Power Supplies, Sequencing, and De-Coupling
24
Board-Level De-Coupling
25
Power Sequencing
25
Power Supplies
25
References
28
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