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MPC8308CVMAGDA 데이터시트(PDF) 37 Page - Freescale Semiconductor, Inc |
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MPC8308CVMAGDA 데이터시트(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 88 page ![]() MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1 Freescale Semiconductor 37 PCI Express Maximum time to transition to a valid electrical idle after sending an electrical idle ordered set TTX-IDLE-SET-TO-I DLE 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- DATA 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 Ω — Transmitter DC impedance ZTX-DC Required TX D+ as well as D- DC Impedance during all states 40 — — Ω — Lane-to-Lane output skew LTX-SKEW Static skew between any two Transmitter Lanes within a single Link — — 500 + 2 UI ps — AC-coupling capacitor CTX All Transmitters are AC-coupled. The AC-coupling is required either within the media or within the transmitting component itself. An external capacitor of 100nF is recommended. 75 — 200 nF — Table 34. Differential Transmitter (TX) Output Specifications (continued) Parameter Symbol Comments Min Typical Max Units Notes |
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