ZHCSIM5F December 2016 – July 2018 AM5746 , AM5748 , AM5749
ADVANCE INFORMATION for pre-production products; subject to change without notice.
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 100 MHz 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 100 MHz 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 7-15 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 |