參數(shù)資料
型號： MPC8544VTARJ
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 533 MHz, MICROPROCESSOR, PBGA783
封裝： 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件頁數(shù)： 77/112頁
文件大?。?/td> 1294K
代理商： MPC8544VTARJ
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
Freescale Semiconductor
67
PCI Express
16.2
Spread Spectrum Clock
SD_REF_CLK/SD_REF_CLK was designed to work with a spread spectrum clock (+0 to 0.5% spreading
at 30–33 kHz rate is allowed), assuming both ends have same reference clock. For better results use a
source without significant unintended modulation.
17 PCI Express
This section describes the DC and AC electrical specifications for the PCI Express bus of the MPC8544.
17.1
DC Requirements for PCI Express SD_REF_CLK and
SD_REF_CLK
17.2
AC Requirements for PCI Express SerDes Clocks
Table 58 provides the AC requirements for the PCI Express SerDes clocks.
17.3
Clocking Dependencies
The ports on the two ends of a link must transmit data at a rate that is within 600 parts per million (ppm)
of each other at all times. This is specified to allow bit rate clock sources with a ±300 ppm tolerance.
17.4
Physical Layer Specifications
The following is a summary of the specifications for the physical layer of PCI Express on this device. For
further details as well as the specifications of the transport and data link layer please refer to the
PCI Express Base Specification. Rev. 1.0a.
17.4.1
Differential Transmitter (TX) Output
Table 59 defines the specifications for the differential output at all transmitters (TXs). The parameters are
specified at the component pins.
Table 58. SD_REF_CLK and SD_REF_CLK AC Requirements
Symbol2
Parameter Description
Min
Typical
Max
Units
Notes
tREF
REFCLK cycle time
—
10
—
ns
1
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
Notes:
1. Typical based on
PCI Express Specification 2.0.
2. Guaranteed by characterization.
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相關代理商/技術參數(shù)
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