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MPC8308CVMADDA Datasheet(PDF) 36 Page - NXP Semiconductors |
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MPC8308CVMADDA Datasheet(HTML) 36 Page - NXP Semiconductors |
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36 / 95 page  MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 4 36 Freescale Semiconductor PCI Express Absolute delta of DC common mode voltage during L0 and electrical idle VTX-CM-DC- ACTIVE- IDLE-DELTA |VTX-CM-DC (during L0) - VTX-CM-Idle-DC (During Electrical Idle)|<=100 mV VTX-CM-DC = DC(avg) of |VTX-D+ + VTX-D-|/2 [L0] VTX-CM-Idle-DC = DC(avg) of |VTX-D+ + VTX-D-|/2 [Electrical Idle] 0 — 100 mV 2 Absolute delta of DC common mode between D+ and D– VTX-CM-DC-LINE- DELTA |VTX-CM-DC-D+ - VTX-CM-DC-D-| <= 25 mV VTX-CM-DC-D+ = DC(avg) of |VTX-D+| VTX-CM-DC-D- = DC(avg) of |VTX-D-| 0— 25 mV 2 Electrical idle differential peak output voltage VTX-IDLE-DIFFp VPEEIDPTX = |VTX-IDLE-D+ -VTX-IDLE-D-| <= 20 mV 0— 20 mV 2 Amount of voltage change allowed during receiver detection VTX-RCV-DETECT The total amount of voltage change that a transmitter can apply to sense whether a low impedance Receiver is present. —600 — mV 6 TX DC common mode voltage VTX-DC-CM The allowed DC Common Mode voltage under any conditions. —3.6 — V 6 TX short circuit current limit ITX-SHORT The total current the Transmitter can provide when shorted to its ground —— 90 mA — Minimum time spent in electrical idle TTX-IDLE-MIN 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 50 — — UI — Maximum time to transition to a valid electrical idle after sending an electrical idle ordered set TTX-IDLE-SET-TO-ID LE 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 L0. —— 20 UI — Maximum time to transition to valid TX specifications after leaving an electrical idle condition TTX-IDLE-TO-DIFF-D ATA 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 —— 20 UI — Differential return loss RLTX-DIFF Measured over 50 MHz to 1.25 GHz. 12 — — dB 4 Common mode return loss RLTX-CM Measured over 50 MHz to 1.25 GHz. 6 — — dB 4 DC differential TX impedance ZTX-DIFF-DC TX DC Differential mode Low Impedance 80 100 120 — Transmitter DC impedance ZTX-DC Required TX D+ as well as D- DC Impedance during all states 40 — — — Lane-to-Lane output skew LTX-SKEW Static skew between any two Transmitter Lanes within a single Link — — 500 + 2 UI ps — Table 34. Differential Transmitter (TX) Output Specifications (continued) Parameter Symbol Comments Min Typical Max Units Note |
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