參數(shù)資料
型號: MC8641DHX1250HE
廠商: Freescale Semiconductor
文件頁數(shù): 90/130頁
文件大小: 0K
描述: IC DUAL CORE PROCESSOR 1023-CBGA
標準包裝: 1
系列: MPC86xx
處理器類型: 32-位 MPC86xx PowerPC
速度: 1.25GHz
電壓: 1.05V
安裝類型: 表面貼裝
封裝/外殼: 1023-BCBGA,F(xiàn)CCBGA
供應商設備封裝: 1023-FCCBGA(33x33)
包裝: 托盤
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
62
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
The input amplitude requirement
— This requirement is described in detail in the following sections.
Figure 39. Receiver of SerDes Reference Clocks
13.2.2
DC Level Requirement for SerDes Reference Clocks
The DC level requirement for the MPC8641D 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 800mV 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 13.2.1, “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 40 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. Each signal wire of the differential inputs is allowed to swing below and above the
command mode voltage (SGND). Figure 41 shows the SerDes reference clock input
requirement for AC-coupled connection scheme.
Single-ended Mode
— The reference clock can also be single-ended. The SDn_REF_CLK input amplitude
(single-ended swing) must be between 400 mV and 800 mV peak-peak (from Vmin to Vmax)
with SDn_REF_CLK either left unconnected or tied to ground.
Input
Amp
50
Ω
50
Ω
SD
n_REF_CLK
SD
n_REF_CLK
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