Hi, I have designed a device using W5500 chip as network interface. The problems I have are these: Auto negotiation does not work. I have to set the PHYCFGR register OPMD and OPMDC bits manually to the 10MB Full Duplex or Half duplex. When I set the mode to 10MBit *-duplex. Device detects link and link led flashes. Also PHYCFGR register shows correct state meaning link is up. I thought this may be related with the switch but I have some Chinese w5500 modules and they work well with the same switch and the same setup. I mean auto-negotiation works with Chinese modules. When I try to send packets MACRAW, link and activity leds go off for some seconds. And then comes back but no packet is sent as I check with wireshark. I configure Interrupts, activate SENDOK interrupt and then try to send MACRAW packet. First packet causes the link and activity leds go off and some seconds later they come back. Although i see leds go off device asserts int pin and Sn_IR register shows SENDOK. When I continue to send packets leds stay normal, w5500 issues SENDOK but nothing received on the other end. (Wireshark) Although no MAC filter is set, and the activity led blinks, device receives nothing. The register Sn_RX_RSR is always 0. Edit: By comparing the Chinese W5500 chip with the one on my design, the W5500 chip on my design gets hotter than the Chinese module W5500. As a summary: I can talk with the W5500 via SPI but W5500 does not talk with ethernet. My Setup: MCU: Atmel Sam4s, arm cortex M4 at 120Mhz. SPI: 4 MHz My design is a copy of the reference schematic in wiznet wiki. Schematic image2338×1653 63.4 KB Layout image1465×658 142 KB There is copper pour ın both sides except under the rj45 jack. I would appreciate any help. Thank you.

Ethernet Communication Problem With W5500 MACRAW

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