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MSC8152 bảng dữ liệu(PDF) 58 Page - Freescale Semiconductor, Inc

tên linh kiện MSC8152
Giải thích chi tiết về linh kiện  Dual-Core Digital Signal Processor
PDF  68 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MSC8152 bảng dữ liệu(HTML) 58 Page - Freescale Semiconductor, Inc

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MSC8152 Dual-Core Digital Signal Processor Data Sheet, Rev. 5
Hardware Design Considerations
Freescale Semiconductor
58
3.3
Clock and Timing Signal Board Layout Considerations
When laying out the system board, use the following guidelines:
•
Keep clock and timing signal paths as short as possible and route with 50
Ω impedance.
•
Use a serial termination resistor placed close to the clock buffer to minimize signal reflection. Use the following
equation to compute the resistor value:
Rterm = Rim – Rbuf
where Rim = trace characteristic impedance
Rbuf = clock buffer internal impedance.
3.4
SGMII AC-Coupled Serial Link Connection Example
Figure 39 shows an example of a 4-wire AC-coupled serial link connection. For additional layout suggestions, see AN3556
MSC815x High Speed Serial Interface Hardware Design Considerations, available on the Freescale website or from your local
sales office or representative.
Figure 39. 4-Wire AC-Coupled SGMII Serial Link Connection Example
SGMII
SerDes Interface
50
Ω
50
Ω
Transmitter
SR[1–2]_TX[[1–2]
SR[1–2]_RX[1–2]
SR[1–2]_TX[1–2]
SR[1–2]_RX[1–2]
Receiver
CTX
CTX
50
Ω
50
Ω
SR[1–2]_RX[1–2]
SR[1–2]_RX[1–2]]
Receiver
Transmitter
SR[1–2]_TX[1–2
]
SR[1–2]_TX[1–2]
CTX
CTX
50
Ω
50
Ω
50
Ω
50
Ω



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