Part Number: DP83TC813S-Q1
Hi team,
We use two board, each board has a MCU and DP83TC813S.When two DP83TC813S uses RMII to connect with MCU, two DP83TC813S can ping successfully. But when using RMGII, connection can not be successful.
The only difference of register between RMII and RGMII is 16h.
When they use TI DP83TC813EVM to connect their own board, it can not ping successfully.
Can you point out some directions to solve it?
Hi Gary,
Please help share schematic. Please also share a block diagram for customer's system which is failing ping.
RGMII protocol has timing constraints that need to be met: Skew should be introduced between CLK and data on TX and RX side:
Please see 812 troubleshooting guide for debug guidance.
Best,
Charles
Hi Charles,
Thanks for your reply.
Please see schematic:
Schematic_ethercat_over_t1_071.pdf
I’d also like to add a bit more information: I tested the RMII link using iperf3 yesterday, and there was about 20% packet loss.
Receive end:
root@OK3588-C-buildroot:~# ethtool -S eth1 | grep rx
mmc_rx_framecount_gb: 325389065
mmc_rx_octetcount_gb: 780139506
mmc_rx_octetcount_g: 335341243
mmc_rx_broadcastframe_g: 0
mmc_rx_multicastframe_g: 7
mmc_rx_crc_error: 66430081
mmc_rx_align_error: 0
mmc_rx_run_error: 0
mmc_rx_jabber_error: 0
mmc_rx_undersize_g: 0
mmc_rx_oversize_g: 0
mmc_rx_64_octets_gb: 0
mmc_rx_65_to_127_octets_gb: 0
mmc_rx_128_to_255_octets_gb: 0
mmc_rx_256_to_511_octets_gb: 0
mmc_rx_512_to_1023_octets_gb: 0
mmc_rx_1024_to_max_octets_gb: 0
mmc_rx_unicast_g: 0
mmc_rx_length_error: 0
mmc_rx_autofrangetype: 0
mmc_rx_pause_frames: 0
mmc_rx_fifo_overflow: 0
mmc_rx_vlan_frames_gb: 0
mmc_rx_watchdog_error: 0
mmc_rx_ipc_intr_mask: 708979299
mmc_rx_ipc_intr: 0
mmc_rx_ipv4_gd: 259238812
mmc_rx_ipv4_hderr: 1752307
mmc_rx_ipv4_nopay: 0
mmc_rx_ipv4_frag: 0
mmc_rx_ipv4_udsbl: 0
mmc_rx_ipv4_gd_octets: 0
mmc_rx_ipv4_hderr_octets: 2586560231
mmc_rx_ipv4_nopay_octets: 0
mmc_rx_ipv4_frag_octets: 0
mmc_rx_ipv4_udsbl_octets: 0
mmc_rx_ipv6_gd_octets: 0
mmc_rx_ipv6_hderr_octets: 0
mmc_rx_ipv6_nopay_octets: 0
mmc_rx_ipv6_gd: 3
mmc_rx_ipv6_hderr: 0
mmc_rx_ipv6_nopay: 0
mmc_rx_udp_gd: 0
mmc_rx_udp_err: 63726728
mmc_rx_tcp_gd: 0
mmc_rx_tcp_err: 1
mmc_rx_icmp_gd: 0
mmc_rx_icmp_err: 0
mmc_rx_udp_gd_octets: 0
mmc_rx_udp_err_octets: 2591802760
mmc_rx_tcp_gd_octets: 0
mmc_rx_tcp_err_octets: 69
mmc_rx_icmp_gd_octets: 0
mmc_rx_icmp_err_octets: 0
mmc_rx_packet_assembly_err_cntr: 274832
mmc_rx_packet_smd_err_cntr: 688093
mmc_rx_packet_assembly_ok_cntr: 0
mmc_rx_fpe_fragment_cntr: 0
rx_desc: 0
rx_collision: 0
rx_crc_errors: 0
rx_length: 0
rx_mii: 0
rx_multicast: 0
rx_gmac_overflow: 0
rx_watchdog: 0
da_rx_filter_fail: 0
sa_rx_filter_fail: 0
rx_missed_cntr: 0
rx_overflow_cntr: 0
rx_vlan: 0
rx_split_hdr_pkt_n: 0
rx_overflow_irq: 0
rx_buf_unav_irq: 0
rx_process_stopped_irq: 0
rx_watchdog_irq: 0
rx_early_irq: 41
rx_pkt_n: 258958984
rx_normal_irq_n: 258957761
mmc_rx_irq_n: 0
mmc_rx_csum_offload_irq_n: 0
irq_rx_path_in_lpi_mode_n: 0
irq_rx_path_exit_lpi_mode_n: 0
no_ptp_rx_msg_type_ext: 258958984
ptp_rx_msg_type_sync: 0
ptp_rx_msg_type_follow_up: 0
ptp_rx_msg_type_delay_req: 0
ptp_rx_msg_type_delay_resp: 0
ptp_rx_msg_type_pdelay_req: 0
ptp_rx_msg_type_pdelay_resp: 0
ptp_rx_msg_type_pdelay_follow_up: 0
PHY register：
ptp_rx_msg_type_announce: 0
ptp_rx_msg_type_management: 0
ptp_rx_msg_pkt_reserved_type: 0
mtl_rx_fifo_fill_level_full: 0
mtl_rx_fifo_fill_above_thresh: 0
mtl_rx_fifo_fill_below_thresh: 0
mtl_rx_fifo_fill_level_empty: 0
mtl_rx_fifo_read_ctrl_flush: 0
mtl_rx_fifo_read_ctrl_read_data: 0
mtl_rx_fifo_read_ctrl_status: 0
mtl_rx_fifo_read_ctrl_idle: 0
mtl_rx_fifo_ctrl_active: 0
mac_rx_frame_ctrl_fifo: 0
mac_gmii_rx_proto_engine: 0
q0_rx_pkt_n: 258958984
q0_rx_irq_n: 258957761
eth1 RX receive muc CRC error frames
Hi Gary,
Please read packet counters in sequence 0x639-0x63e. The results you show above are valid but if packet counters are read out of sequence, they will not increment until cleared with 0x639-0x63e read.
You can take these steps for debug:
PHY functionality check:
MDI side check:
MAC side check:
After performing these 3 tests, you will be able to isolate where packet drops are occurring. Please let me know if you have any questions.
Best,
Charles
