15. Arria V GZ Transceiver Native PHY IP Core
Unlike other PHY IP Cores, the Native PHY IP Core does not include an Avalon Memory-Mapped (Avalon-MM) interface. Instead, it exposes all signals directly as ports. The Arria V GZ Transceiver Native PHY IP Core provides the following three datapaths:
- Standard PCS
- 10G PCS
- PMA Direct
You can enable the Standard PCS, the 10G PCS, or both if your design uses the Transceiver Reconfiguration Controller to change dynamically between the two PCS datapaths. The transceiver PHY does not include an embedded reset controller. You can either design custom reset logic or incorporate Altera’s “Transceiver PHY Reset Controller IP Core” to implement reset functionality.
In PMA Direct mode, the Native PHY provides direct access to the PMA from the FPGA fabric; consequently, the latency for transmitted and received data is very low. However, you must implement any PCS function that your design requires in the FPGA fabric.
The following figure illustrates the use of the Arria V GZ Transceiver Native PHY IP Core. As this figure illustrates, TX PLL and clock data recovery (CDR) reference clocks from the pins of the device are input to the PLL module and CDR logic. When enabled, the 10G or Standard PCS drives TX parallel data and receives RX parallel data. When neither PCS is enabled the Native PHY operates in PMA Direct mode.
In a typical design, the separately instantiated Transceiver PHY Reset Controller drives reset signals to Native PHY and receives calibration and locked status signal from the Native PHY. The Native PHY reconfiguration buses connect the external Transceiver Reconfiguration Controller for calibration and dynamic reconfiguration of the PLLs.
You specify the initial configuration when you parameterize the IP core. The Transceiver Native PHY IP Core connects to the “Transceiver Reconfiguration Controller IP Core” to dynamically change reference clocks and PLL connectivity at runtime.
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