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BCM4354 Datasheet(PDF) 178 Page - Cypress Semiconductor |
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BCM4354 Datasheet(HTML) 178 Page - Cypress Semiconductor |
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178 / 192 page ![]() PCI Express Interface Parameters BCM4354 Data Sheet BROADCOM CONFIDENTIAL Broadcom® October 15, 2014 • 4354-DS109-R Page 177 PCI Express Interface Parameters Table 60: PCI Express Interface Parameters Parameter Symbol Comments Minimum Typical Maximum Unit General Baud rate BPS – – 5 – Gbaud Reference clock amplitude Vref LVPECL 1 – – V Receiver Differential termination ZRX-DIFF-DC Differential termination 80 100 120 Ω DC impedance ZRX-DC DC common-mode impedance 40 50 60 Ω Powered down termination (POS) ZRX-HIGH-IMP-DC- POS Power-down or RESET high impedance 100k – – Ω Powered down termination (NEG) ZRX-HIGH-IMP-DC- NEG Power-down or RESET high impedance 1k – – Ω Input voltage VRX-DIFFp-p AC coupled, differential p-p 175 – – mV Jitter tolerance TRX-EYE Minimum receiver eye width 0.4 – – UI Differential return loss RLRX-DIFF Differential return loss 10 – – dB Common-mode return loss RLRX-CM Common-mode return loss 6– – dB Unexpected electrical idle enter detect threshold integration time TRX-IDEL-DET- DIFF-ENTERTIME An unexpected electrical idle must be recognized no longer than this time to signal an unexpected idle condition. –– 10 ms Signal detect threshold VRX-IDLE-DET- DIFFp-p Electrical idle detect threshold 65 – 175 mV Transmitter Output voltage VTX-DIFFp-p Differential p-p, programmable in 16 steps 0.8 – 1200 mV Output voltage rise time VTX-RISE 20% to 80% 0.125 (2.5 GT/s) 0.15 (5 GT/s) –– UI Output voltage fall time VTX-FALL 80% to 20% 0.125 (2.5 GT/s) 0.15 (5 GT/s) –– UI |
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