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MPC8572ELVTAULD Datasheet(PDF) 82 Page - Freescale Semiconductor, Inc |
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MPC8572ELVTAULD Datasheet(HTML) 82 Page - Freescale Semiconductor, Inc |
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82 / 140 page  MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4 82 Freescale Semiconductor PCI Express • Section 16, “PCI Express” • Section 17, “Serial RapidIO” Note that external AC Coupling capacitor is required for the above three serial transmission protocols with the capacitor value defined in specification of each protocol section. 16 PCI Express This section describes the DC and AC electrical specifications for the PCI Express bus of the MPC8572E. 16.1 DC Requirements for PCI Express SD1_REF_CLK and SD1_REF_CLK For more information, see Section 15.2, “SerDes Reference Clocks.” 16.2 AC Requirements for PCI Express SerDes Reference Clocks Table 60 lists AC requirements. 16.3 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. 16.4 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, Use the PCI Express Base Specification. REV. 1.0a document. 16.4.1 Differential Transmitter (TX) Output Table 61 defines the specifications for the differential output at all transmitters (TXs). The parameters are specified at the component pins. Table 60. SD1_REF_CLK and SD1_REF_CLK AC Requirements Symbol 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 cycle time is based on PCI Express Card Electromechanical Specification Revision 1.0a. |
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