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copticjo
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re: PCI Express 4.0 drives to 16 GT/second
copticjo   7/19/2012 10:34:01 PM
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Are there any papers on the subject. I'm very surprised to not find any papers on PCI-Gen4. Only news releases.

Ryan Tennill
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re: PCI Express 4.0 drives to 16 GT/second
Ryan Tennill   11/30/2011 2:08:03 AM
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"The first two versions of PCIe used 8b/10b encoding, and thus had lower processing overhead." "Version 4.0 will use the same 128b/130b encoding..." I was under the impression that going to 128b/130b was a rather significant reduction in overhead compared to 8b/10b or is this referring to the scrambling/descrambling that is applied to the data? After all the 2 bits in an 8b/10b encoding is 20% while 128b/130b is 1.5%.

rick merritt
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re: PCI Express 4.0 drives to 16 GT/second
rick merritt   11/29/2011 4:55:51 PM
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What do you see on the horizon for pc boards with optical interconnects?



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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