PCIe Root

Complex

Pre-Cursor: 3.5 dB

Post-Cursor: -6 dB

DS160PR410

RX EQ Boost: 18 dB

TL1

-30 dB @ 8 GHz

TL2

-15 dB @ 8 GHz

PCIe

End Point

RX CTLE: 12 dB

20

DS160PR410

SNLS645 – AUGUST 2019

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Typical Applications (continued)

8.2.1.3 Application Curves

The DS160PR410 is a linear redriver that can be used to extend channel reach of a PCIe link. Normally, PCIe-

compliant TX and RX are equipt with signal-conditioning functions and can handle channel losses of up to 28 dB

at 8 GHz. With the DS160PR410, the total channel loss between a PCIe root complex and an end point can be

up to 45 dB at 8 GHz.

Figure 5 shows an electric link that models a single channel of a PCIe link and eye diagrams measured at

different locations along the link. The source that models a PCIe TX sends a 16-Gbps PRBS-15 signal with P7

presets. After a transmission channel with –30 dB at 8-GHz insertion loss, the eye diagram is fully closed. The

DS160PR410 with its CTLE set to the maximum (18-dB boost) together with the source TX equalization

compensates for the losses of the pre-channel (TL1) and opens the eye at the output of the DS160PR410.

The post-channel (TL2) losses mandate the use of PCIe RX equalization functions such as CTLE and DFE that

are normally available in PCIe-compliant receivers.

Figure 5. PCIe Gen-4 Link Reach Extension Using DS160PR410