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MPC8640DEC Datasheet(PDF) 72 Page - Freescale Semiconductor, Inc |
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MPC8640DEC Datasheet(HTML) 72 Page - Freescale Semiconductor, Inc |
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72 / 140 page  MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1 72 Freescale Semiconductor PCI Express VTX-RCV-DETECT The amount of voltage change allowed during Receiver Detection 600 mV The total amount of voltage change that a transmitter can apply to sense whether a low impedance Receiver is present. See Note 6. VTX-DC-CM The TX DC Common Mode Voltage 0 3.6 V The allowed DC Common Mode voltage under any conditions. See Note 6. ITX-SHORT TX Short Circuit Current Limit 90 mA The total current the Transmitter can provide when shorted to its ground TTX-IDLE-MIN Minimum time spent in Electrical Idle 50 UI Minimum time a Transmitter must be in Electrical Idle Utilized by the Receiver to start looking for an Electrical Idle Exit after successfully receiving an Electrical Idle ordered set TTX-IDLE-SET-TO-IDLE Maximum time to transition to a valid Electrical idle after sending an Electrical Idle ordered set 20 UI After sending an Electrical Idle ordered set, the Transmitter must meet all Electrical Idle Specifications within this time. This is considered a debounce time for the Transmitter to meet Electrical Idle after transitioning from LO. TTX-IDLE-TO-DIFF-DATA Maximum time to transition to valid TX specifications after leaving an Electrical idle condition 20 UI Maximum time to meet all TX specifications when transitioning from Electrical Idle to sending differential data. This is considered a debounce time for the TX to meet all TX specifications after leaving Electrical Idle RLTX-DIFF Differential Return Loss 12 dB Measured over 50 MHz to 1.25 GHz. See Note 4 RLTX-CM Common Mode Return Loss 6 dB Measured over 50 MHz to 1.25 GHz. See Note 4 ZTX-DIFF-DC DC Differential TX Impedance 80 100 120 Ω TX DC Differential mode Low Impedance ZTX-DC Transmitter DC Impedance 40 Ω Required TX D+ as well as D- DC Impedance during all states LTX-SKEW Lane-to-Lane Output Skew 500 + 2 UI ps Static skew between any two Transmitter Lanes within a single Link CTX AC Coupling Capacitor 75 200 nF All Transmitters shall be AC coupled. The AC coupling is required either within the media or within the transmitting component itself. Table 48. Differential Transmitter (TX) Output Specifications (continued) Symbol Parameter Min Nom Max Units Comments |
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