Device Family: Intel® Agilex™, Intel® Stratix® 10 MX, Intel® Stratix® 10 TX

Intel Software: Quartus Prime Pro

Type: Answers, Errata

Area: Intellectual Property


Last Modified: October 16, 2020
Version Found: v19.2
Bug ID: 1507999569
IP: JESD204B

Why do I see a large number of warnings related to RAM blocks being synthesized away when compiling an Intel® Stratix® 10 or Intel® Agilex™ design with the JESD204C Intel® FPGA IP in RX Simplex mode in the Intel® Quartus® Prime Pro Edition software version 19.2 and later?

Description

When compiling a design with the JESD204C Intel® FPGA IP in RX Simplex mode targeting Intel® Stratix® 10 devices with E-Tile transceivers or Intel® Agilex™ devices using the Intel® Quartus® Prime Pro Edition software version 19.2 and later, you may see warnings like the ones shown below.

 

The following warnings are related to signals rx_eb_data_soemb_out_w_w[L-1:0] and rx_eb_data_somb_out_w_w[L-1:0] and can be safely ignored as only bit [0] of each will be used as an input to the transport layer.

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[129]"

 Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[130]" 

 

The following warnings are related to signals j204c_rx_cmd_data [18:7] when the sync header configuration is CRC-12. These can be safely ignored as CRC-12 configuration only uses the lower 7 bits (thus 12 signals will be synthesized away).

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[138]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[139]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[140]"

 Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[141]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[142]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[143]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[144]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[145]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[146]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[147]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[148]" 

Warning(14320): Synthesized away node "u_j204c_rx_tx_ss|j204c_rx_tx_ip|intel_jesd204c|intel_jesd204c|j204c_rx_base_inst|j204c_rx_ll_top_inst|rx_ll_per_lane_inst[0].j204c_rx_eb_inst|j204c_eb_fifo|j204c_rx_eb_fifo_noecc_inst|j204c_rx_eb_fifo_noecc|scfifo_component|auto_generated|dpfifo|FIFOram|altera_syncram_impl1|q_b[149]"

Workaround/Fix

These warning messages are expected and can be safely ignored.