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參數(shù)資料
| 型號： | MPC8378VRANGA |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 110/128頁 |
| 文件大小： | 0K |
| 描述： | MPU POWERQUICC II 800MHZ 689PBGA |
| 標準包裝： | 27 |
| 系列： | MPC83xx |
| 處理器類型： | 32-位 MPC83xx PowerQUICC II Pro |
| 速度： | 800MHz |
| 電壓： | 1.05V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 689-BBGA 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 689-TEPBGA II（31x31） |
| 包裝： | 托盤 |
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MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
82
Freescale Semiconductor
— If the device driving the SDn_REF_CLK and SDn_REF_CLK inputs cannot drive 50
Ω to
SGND_SRDSn (xcorevss) DC, or it exceeds the maximum input current limitations, then it
must be AC-coupled off-chip.
The input amplitude requirement
— This requirement is described in detail in the following sections.
Figure 55. Receiver of SerDes Reference Clocks
20.2.2
DC Level Requirement for SerDes Reference Clocks
The DC level requirement for the device 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 less than 800 mV and
greater than 200 mV. This requirement is the same for both external DC-coupled or
AC-coupled connection.
— For external DC-coupled connection, as described in Section 20.2.1, “SerDes Reference
Clock Receiver Characteristics,” the maximum average current requirements sets the
requirement for average voltage (common mode voltage) to be between 100 mV and 400 mV.
Figure 56 shows the SerDes reference clock input requirement for DC-coupled connection
scheme.
— For external AC-coupled connection, there is no common mode voltage requirement for the
clock driver. Since the external AC-coupling capacitor blocks the DC level, the clock driver
and the SerDes reference clock receiver operate in different command mode voltages. The
SerDes reference clock receiver in this connection scheme has its common mode voltage set to
SGND_SRDSn. Each signal wire of the differential inputs is allowed to swing below and above
the command mode voltage (SGND_SRDSn). Figure 57 shows the SerDes reference clock
input requirement for AC-coupled connection scheme.
Input
Amp
50
Ω
50
Ω
SD
n_REF_CLK
SD
n_REF_CLK
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