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MPC8308CVMADDA Datasheet(PDF) 39 Page - NXP Semiconductors |
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MPC8308CVMADDA Datasheet(HTML) 39 Page - NXP Semiconductors |
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39 / 95 page ![]() MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 4 Freescale Semiconductor 39 PCI Express AC peak common mode input voltage VRX-CM-ACp VPEACPCMRX = |VRXD+ + VRXD-|/2 - VRX-CM-DC VRX-CM-DC = DC(avg) of |VRX-D+ + VRX-D-|/2 —— 150 mV 2 Differential return loss RLRX-DIFF Measured over 50 MHz to 1.25 GHz with the D+ and D- lines biased at +300 mV and -300 mV, respectively. 15 — — dB 4 Common mode return loss RLRX-CM Measured over 50 MHz to 1.25 GHz with the D+ and D- lines biased at 0 V. 6— — dB 4 DC differential input impedance ZRX-DIFF-DC RX DC differential mode impedance. 80 100 120 5 DC Input Impedance ZRX-DC Required RX D+ as well as D- DC Impedance (50 ± 20% tolerance). 40 50 60 2, 5 Powered down DC input impedance ZRX-HIGH-IMP-DC Required RX D+ as well as D- DC Impedance when the Receiver terminations do not have power. 200 k — — 6 Electrical idle detect threshold VRX-IDLE-DET-DIFFp-p VPEEIDT = 2*|VRX-D+ -VRX-D-| Measured at the package pins of the Receiver 65 — 175 mV — Unexpected Electrical Idle Enter Detect Threshold Integration Time TRX-IDLE-DET-DIFF- ENTERTIME An unexpected Electrical Idle (Vrx-diffp-p < Vrx-idle-det-diffp-p) must be recognized no longer than Trx-idle-det-diff-entertime to signal an unexpected idle condition. —— 10 ms — Total Skew LRX-SKEW Skew across all lanes on a Link. This includes variation in the length of SKP ordered set (for example, COM and one to five SKP Symbols) at the RX as well as any delay differences arising from the interconnect itself. — — 20 ns — Table 35. Differential Receiver (RX) Input Specifications (continued) Parameter Symbol Comments Min Typical Max Units Note |
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