Gmii Receiver Logic, Implementing External Gmii

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Implementing External GMII

GMII Receiver Logic

Spartan-3, Spartan-3E, Spartan-3A and Virtex-4 Devices

ADCM must be used on the gmii_rx_clk clock path, as illustrated in Figure 7-2, to meet the input setup and hold requirements for GMII. This is performed by the example designs delivered with the core (all signal names and logic match Figure 7-2). This DCM circuitry may optionally be used in other families.

Phase-shifting may then be applied to the DCM to fine-tune the setup and hold times at the GMII IOB input flip-flops. Fixed phase-shift is applied to the DCM with the example UCF for the example design. See Appendix C, “Calculating DCM Phase-Shifting.”

					IOB LOGIC
	BUFG		DCM		IBUFG
			DCM			gmii_rx_clk
		gmii_rx_clk0				gmii_rx_clk
		gmii_rx_clk0	CLK0 CLKIN			IPAD
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				FB
				FB
gmii_rx_clk	gmii_rx_clk_bufg
	gmii_rx_clk_bufg
					IOB LOGIC
					IBUF
	gmii_rxd_reg[0]					gmii_rxd[0]
gmii_rxd[0]	gmii_rxd_reg[0]		Q D			IPAD

			IBUF
	gmii_rx_dv_reg			gmii_rx_dv
gmii_rx_dv	gmii_rx_dv_reg
		Q D		IPAD
		Q D		IPAD

		IBUF
	gmii_rx_er_reg		gmii_rx_er
gmii_rx_er
	Q D		IPAD

Figure 7-2:External GMII Receiver Logic for Spartan-3, Spartan-3E, and Spartan-3A Devices

1-Gigabit Ethernet MAC v8.5 User Guide

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UG144 April 24, 2009

UG144 specifications

The Xilinx UG144, a comprehensive user guide for the versatile Zynq-7000 SoC (System on Chip) architecture, serves as an essential resource for developers and engineers designing embedded systems. Emphasizing the blend of programmable logic and processing power, this guide highlights the array of features and technologies that make the Zynq-7000 series particularly attractive for a wide range of applications.

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Overall, the Xilinx UG144 guide encapsulates the versatility, performance, and flexibility of the Zynq-7000 SoC architecture. With its combination of ARM processing and programmable logic, along with robust connectivity options and development tools, it empowers engineers to create innovative solutions across a spectrum of industries, solidifying Xilinx's position as a leader in the field of embedded system design.

Xilinx UG144 manual Gmii Receiver Logic, Spartan-3, Spartan-3E, Spartan-3A and Virtex-4 Devices

Models: UG144