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| 型号： | MSC8256SVT800B |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 0-BIT, OTHER DSP, PBGA783 |
| 封装： | 29 X 29 MM, LEAD FREE, PLASTIC, FCBGA-783 |
| 文件页数： | 24/68页 |
| 文件大小： | 910K |
| 代理商： | MSC8256SVT800B |
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MSC8256 Six-Core Digital Signal Processor Data Sheet, Rev. 3
Electrical Characteristics
Freescale Semiconductor
30
2.5.2.3
SerDes Transmitter and Receiver Reference Circuits
Figure 6 shows the reference circuits for SerDes data lane transmitter and receiver.
2.5.3
DC-Level Requirements for SerDes Interfaces
The following subsections define the DC-level requirements for the SerDes reference clocks, the PCI Express data lines, the
Serial RapidIO data lines, and the SGMII data lines.
2.5.3.1
DC-Level Requirements for SerDes Reference Clocks
The DC-level requirement for the SerDes reference clock inputs is different depending on the signaling mode used to connect
the clock driver chip and SerDes reference clock inputs, as described below:
Differential Mode
— The input amplitude of the differential clock must be between 400 mV and 1600 mV differential peak-peak (or
between 200 mV and 800 mV differential peak). In other words, each signal wire of the differential pair must have
a single-ended swing of less than 800 mV and greater than 200 mV. This requirement is the same for both external
DC-coupled or AC-coupled connection.
— For an external DC-coupled connection, the maximum average current requirements sets the requirement for
average voltage (common mode voltage) as between 100 mV and 400 mV. Figure 7 shows the SerDes reference
clock input requirement for DC-coupled connection scheme.
Figure 6. SerDes Transmitter and Receiver Reference Circuits
Figure 7. Differential Reference Clock Input DC Requirements (External DC-Coupled)
50
Ω
50
Ω
50
Ω
50
Ω
Transmitter
Receiver
SR[1–2]_TXm
SR[1–2]_RXm
SR[1–2]_TXm
SR[1–2]_RXm
Note: The [1–2] indicates the specific SerDes Interface (1 or 2) and the m indicates the
specific channel within that interface (0,1,2,3). Actual signals are assigned by the
HRCW assignments at reset (see Chapter 5, Reset in the reference manual for details)
SR[1–2]_REF_CLK
Vmax < 800 mV
Vmin > 0V
100 mV < Vcm < 400 mV
200 mV < Input Amplitude or Differential Peak < 800 mV
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