GTS JESD204C Intel® FPGA IP Design Example User Guide

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ID 813978
Date 12/13/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the GTS JESD204C Intel® FPGA IP Design Example User Guide 2. GTS JESD204C Intel® FPGA IP Design Example Quick Start Guide 3. Detailed Description for the GTS JESD204C Design Example 4. Document Revision History for the GTS JESD204C Intel® FPGA IP Design Example User Guide
2. GTS JESD204C Intel® FPGA IP Design Example Quick Start Guide x
2.1. Design Example Block Diagram 2.2. Hardware and Software Requirements 2.3. Generating the Design 2.4. Dual Simplex Design Example 2.5. Simulating the Design Example Testbench 2.6. Compiling and Testing the Design
2.3. Generating the Design x
2.3.1. Design Example Parameters 2.3.2. Directory Structure
3. Detailed Description for the GTS JESD204C Design Example x
3.1. System Components 3.2. GTS JESD204C Design Example Clock and Reset 3.3. GTS JESD204C Design Example Signals 3.4. GTS JESD204C Design Example Control Registers 3.5. Hardware Test for System Console Control Design Example
3.1. System Components x
3.1.1. JTAG to Avalon® Master Bridge 3.1.2. Parallel I/O (PIO) Core 3.1.3. SPI Master 3.1.4. IOPLL 3.1.5. SYSREF Generator 3.1.6. Reset Sequencers 3.1.7. 3-Wire SPI 3.1.8. Pattern Generator and Checker 3.1.9. GTS JESD204C TX and RX IP
1. About the GTS JESD204C Intel® FPGA IP Design Example User Guide
2. GTS JESD204C Intel® FPGA IP Design Example Quick Start Guide
3. Detailed Description for the GTS JESD204C Design Example
4. Document Revision History for the GTS JESD204C Intel® FPGA IP Design Example User Guide

3.2. GTS JESD204C Design Example Clock and Reset

The GTS JESD204C design example has a set of clock and reset signals.
Table 13.  Design Example Clocks
Clock Signal Direction Description
mgmt_clk Input LVDS differential clock with frequency of 100 MHz.
refclk_xcvr Input Transceiver reference clock with frequency of the PLL Selection.
refclk_core Input Core reference clock with the same frequency as refclk_xcvr.
in_sysref Input SYSREF signal.

Maximum SYSREF frequency is data rate/(66x32xE).

sysref_out Output

txlink_clk

rxlink_clk

Internal TX and RX link clock with frequency of data rate/66.

txframe_clk

rxframe_clk

Internal
  • TX and RX frame clock with frequency of data rate/33 (FCLK_MULP=2)
  • TX and RX frame clock with frequency of data rate/66 (FCLK_MULP=1)

tx_fclk

rx_fclk

Internal
  • TX and RX phase clock with frequency of data rate/66 (FCLK_MULP=2)
  • TX and RX phase clock is always high (1'b1) when FCLK_MULP=1
spi_SCLK Output SPI baud rate clock with frequency of 20 MHz.
pma_cu_clk Internal The internal clock from the GTS Reset Sequencer Intel® FPGA IP to the transceiver logic.

When you load the design example into an FPGA device, an internal ninit_done event ensures that the JTAG to Avalon® Master bridge is in reset as well as all the other blocks.

The SYSREF generator has its independent reset to inject intentional asynchronous relationship for the txlink_clk and rxlink_clk clocks. This method is more comprehensive in emulating the SYSREF signal from an external clock chip.

Table 14.  Design Example Resets
Reset Signal Direction Description
global_rst_n Input Push button global reset for all blocks, except the JTAG to Avalon® Master bridge.
ninit_done Internal Output from Reset Release IP for the JTAG to Avalon® Master bridge.
edctl_rst_n Internal The ED Control block is reset by JTAG to Avalon® Master bridge. The hw_rst and global_rst_n ports do not reset the ED Control block.
hw_rst Internal Assert and deassert hw_rst by writing to the rst_ctl register of the ED Control block. mgmt_rst_in_n asserts when hw_rst is asserted.
mgmt_rst_in_n Internal Reset for Avalon® memory-mapped interfaces of various IPs and inputs of reset sequencers:
  • reconfig_xcvr_reset for GTS JESD204C IP duplex Native PHY
  • spi_rst_n for SPI master
  • pio_rst_n for PIO status and control
  • reset_in0 port of reset sequencer 0 and 1

The global_rst_n, hw_rst, or edctl_rst_n port asserts reset on mgmt_rst_in_n.

sysref_rst_n Internal Reset for SYSREF generator block in the ED Control block using the reset sequencer 0 reset_out2 port. The reset sequencer 0 reset_out2 port deasserts the reset if the core PLL is locked.
core_pll_rst Internal Resets the core PLL through the reset sequencer 0 reset_out0 port. The core PLL resets when mgmt_rst_in_n reset is asserted.
j204c_tx_avs_rst_n Internal Resets the GTS JESD204C TX Avalon® memory-mapped interface through reset sequencer 0. The TX Avalon® memory-mapped interface asserts when mgmt_rst_in_n is asserted.
j204c_rx_avs_rst_n Internal Resets the GTS JESD204C TX Avalon® memory-mapped interface through reset sequencer 1. The RX Avalon® memory-mapped interface asserts when mgmt_rst_in_n is asserted.
j204c_tx_rst_n Internal Resets the GTS JESD204C TX link and transport layers in txlink_clk, and txframe_clk, domains.

The reset sequencer 0 reset_out5 port resets j204c_tx_rst_n. This reset deasserts if the core PLL is locked, and the j204c_tx_rst_ack_n signal is asserted.

j204c_rx_rst_n Internal Resets the GTS JESD204C RX link and transport layers in, rxlink_clk,and rxframe_clk domains.

The reset sequencer 1 reset_out4 port resets j204c_rx_rst_n. This reset deasserts if the core PLL is locked, and the j204c_rx_rst_ack_n signal is asserted.

j204c_tx_rst_ack_n Internal Reset handshakes signal with j204c_tx_rst_n.
j204c_rx_rst_ack_n Internal Reset handshakes signal with j204c_rx_rst_n.
Figure 10. Timing Diagram for the Design Example Resets
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