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KMPC8568VTAQGJA 데이터시트(PDF) 71 Page - Freescale Semiconductor, Inc |
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KMPC8568VTAQGJA 데이터시트(HTML) 71 Page - Freescale Semiconductor, Inc |
71 / 139 page MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1 Freescale Semiconductor 71 PCI Express 14.3 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. 14.4 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 use the PCI EXPRESS Base Specification. REV. 1.0a document. 14.4.1 Differential Transmitter (TX) Output Table 51 defines the specifications for the differential output at all transmitters (TXs). The parameters are specified at the component pins. 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. Table 51. Differential Transmitter (TX) Output Specifications Symbol Parameter Min Nom Max Units Comments UI Unit Interval 399.88 400 400.12 ps Each UI is 400 ps ± 300 ppm. UI does not account for Spread Spectrum Clock dictated variations. See Note 1. VTX-DIFFp-p Differential Peak-to-Peak Output Voltage 0.8 — 1.2 V VTX-DIFFp-p = 2*|VTX-D+ – VTX-D-| See Note 2. VTX-DE-RATIO De- Emphasized Differential Output Voltage (Ratio) –3.0 –3.5 –4.0 dB Ratio of the VTX-DIFFp-p of the second and following bits after a transition divided by the VTX-DIFFp-p of the first bit after a transition. See Note 2. TTX-EYE Minimum TX Eye Width 0.70 — — UI The maximum Transmitter jitter can be derived as TTX-MAX-JITTER = 1 – TTX-EYE= 0.3 UI. See Notes 2 and 3. TTX-EYE-MEDIAN-to- MAX-JITTER Maximum time between the jitter median and maximum deviation from the median. — — 0.15 UI Jitter is defined as the measurement variation of the crossing points (VTX-DIFFp-p = 0 V) in relation to a recovered TX UI. A recovered TX UI is calculated over 3500 consecutive unit intervals of sample data. Jitter is measured using all edges of the 250 consecutive UI in the center of the 3500 UI used for calculating the TX UI. See Notes 2 and 3. TTX-RISE, TTX-FALL D+/D- TX Output Rise/Fall Time 0.125 — — UI See Notes 2 and 5 Table 50. SD_REF_CLK and SD_REF_CLK AC Requirements Symbol Parameter Description Min Typical Max Units Notes |
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