关键问题
如果您在 MAC 功能的 MII 上启用本地环回,GMII, 或 RGMII,Quartus II 软件显示以下警告 编译设计时的消息:
Critical Warning: "mixed_port_feed_through_mode" parameter
of RAM atom altera_tse_mac:altera_tse_mac_inst|altera_tse_top_gen_host:top_gen_host_inst|altera_tse_top_w_fifo_10_100_1000:U_MAC_TOP|altera_tse_loopback_ff:U_LBFF|altera_tse_a_fifo_24:U_LBFF|altera_tse_sdpm_altsyncram:U_RAM|altsyncram:altsyncram_component|altsyncram_o4e1:auto_generated|ram_block1a8 cannot
have value "old" when different read and write clocks are used.
Critical Warning: "mixed_port_feed_through_mode" parameter of RAM
atom altera_tse_mac:altera_tse_mac_inst|altera_tse_top_gen_host:top_gen_host_inst|altera_tse_top_w_fifo_10_100_1000:U_MAC_TOP|altera_tse_loopback_ff:U_LBFF|altera_tse_a_fifo_24:U_LBFF|altera_tse_sdpm_altsyncram:U_RAM|altsyncram:altsyncram_component|altsyncram_o4e1:auto_generated|ram_block1a7 cannot
have value "old" when different read and write clocks are used.
您可以安全地忽略警告消息。
此问题将影响启用本地环回的所有设计 在 MAC 的 MII 上,GMII 或 RGMII。
无解决方法。此问题将在将来的版本中修复 三速以太网 MegaCore 功能之一。