JAJSGC7F December 2015 – May 2019 AM5726 , AM5728 , AM5729
PRODUCTION DATA.
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A Common Refclk Rx Architecture is required to be used for the device PCIe interface. Specifically, two modes of Common Refclk Rx Architecture are supported:
In External REFCLK Mode, a high-quality, low-jitter, differential HCSL 100MHz clock source compliant to the PCIe REFCLK AC Specifications should be provided on the Device’s ljcb_clkn / ljcb_clkp inputs.
Alternatively, an LVDS clock source can be used with the following additional requirements:
In Output REFCLK Mode, the 100MHz clock from the Device’s DPLL_PCIE_REF should be output on the Device’s ljcb_clkn / ljcb_clkp pins and used as the HCSL REFCLK by the link partner. External near-side termination to ground described in Table 8-15 is required on both of the ljcb_clkn / ljcb_clkp outputs in this mode.
PARAMETER | MIN | TYP | MAX | UNIT |
---|---|---|---|---|
ljcb_clkn / ljcb_clkp AC coupling capacitor value | 100 | nF | ||
ljcb_clkn / ljcb_clkp AC coupling capacitor package size | 0402 | 0603 | EIA(1)(2) |
PARAMETER | MIN | TYP | MAX | UNIT |
---|---|---|---|---|
ljcb_clkn / ljcb_clkp near-side termination to ground value | 47.5 | 50 | 52.5 | Ohms |