參數(shù)資料
型號(hào): MC8641DVU1250JC
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: MICROPROCESSOR, CBGA1023
封裝: 33 X 33 MM, ROHS COMPLIANT, CERAMIC, BGA-1023
文件頁數(shù): 109/140頁
文件大?。?/td> 1484K
代理商: MC8641DVU1250JC
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 0
70
Freescale Semiconductor
PCI Express
13.3
SerDes Transmitter and Receiver Reference Circuits
Figure 49 shows the reference circuits for SerDes data lane’s transmitter and receiver.
Figure 49. SerDes Transmitter and Receiver Reference Circuits
The DC and AC specification of SerDes data lanes are defined in each interface protocol section below
(PCI Express or Serial Rapid IO) in this document based on the application usage:”
Note that external AC Coupling capacitor is required for the above two serial transmission protocols with
the capacitor value defined in specification of each protocol section.
14 PCI Express
This section describes the DC and AC electrical specifications for the PCI Express bus of the MPC8641.
14.1
DC Requirements for PCI Express SD
n_REF_CLK and
SD
n_REF_CLK
For more information, see Section 13.1, “DC Requirements for SerDes Reference Clocks.”
14.2
AC Requirements for PCI Express SerDes Clocks
Table 48 lists AC requirements.
Table 48. SD
n_REF_CLK and SDn_REF_CLK AC Requirements
Symbol
Parameter Description
Min
Typical
Max
Units
Notes
tREF
REFCLK cycle time
-
10
-
ns
tREFCJ
REFCLK cycle-to-cycle jitter. Difference in the period of any two
adjacent REFCLK cycles
100
ps
tREFPJ
Phase jitter. Deviation in edge location with respect to mean
edge location
–50
50
ps
50
Ω
50
Ω
Receiver
Transmitter
SD1_TX
n or
SD2_TX
n
SD1_TX
n or
SD2_TX
n
SD1_RX
n or
SD2_RX
n
SD1_RX
n or
SD2_RX
n
50
Ω
50
Ω
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