Xilinx 1000BASE-X manual Virtex-5 LXT and SXT Devices, Virtex-5 RocketIO GTP Wizard

RocketIO Transceiver Logic

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Virtex-5 LXT and SXT Devices

The core is designed to integrate with the Virtex-5 RocketIO GTP transceiver. Figure 7-3illustrates the connections and logic required between the core and the GTP transceiver— the signal names and logic in the figure precisely match those delivered with the example design when a GTP transceiver is used.

Note: A small logic shim (included in the block-level wrapper) is required to convert between the port differences between the Virtex-II Pro and Virtex-5 GTP transceiver.

A GTP tile consists of a pair of transceivers. For this reason, the GTP transceiver wrapper delivered with the core always contains two GTP instantiations, even if only a single GTP transceiver tile is in use. Figure 7-3illustrates a single GTP transceiver tile.

The 125 MHz differential reference clock is routed directly to the GTP transceiver. The GTP transceiver is configured to output a version of this clock on the REFCLKOUT port and after placement onto global clock routing, can be used by all core logic. This clock is input back into the GTP transceiver on the user interface clock ports rxusrclk, rxusrclk2, txusrclk, and txusrclk2.

See also “Virtex-5 RocketIO GTP Transceivers for 1000BASE-X Constraints,” page 166.

Virtex-5 RocketIO GTP Wizard

The two wrapper files immediately around the GTP transceiver pair,

rocketio_wrapper_gtp_tile and rocketio_wrapper_gtp (see Figure 7-3), are generated from the RocketIO GTP Wizard. These files apply all the gigabit Ethernet attributes. Consequently, these files can be regenerated by customers and therefore be easily targeted at ES or Production silicon. Note that this core targets production silicon.

The CORE Generator log file (XCO file) which was created when the RocketIO GTP Wizard project was generated is available in the following location:

<project_directory>/<component_name>/example_design/transceiver/ rocketio_wrapper_gtp.xco

This file can be used as an input to the CORE Generator to regenerate the RocketIO wrapper files. The XCO file itself contains a list of all of the GTP Wizard attributes which were used. For further information, please refer to the Virtex-5 RocketIO GTP Wizard Getting Started Guide (UG188) and the CORE Generator Guide, at www.xilinx.com/support/software_manuals.htm

Ethernet 1000BASE-X PCS/PMA or SGMII v9.1 www.xilinx.com 83

UG155 March 24, 2008